diff --git a/README.md b/README.md
index 862ad143..92969728 100644
--- a/README.md
+++ b/README.md
@@ -2470,6 +2470,43 @@ try {
 }
 
 ```
+
+#### Get boards
+[See Jira API reference](https://developer.atlassian.com/cloud/jira/software/rest/#api-rest-agile-1-0-board-get)
+
+```php
+<?php
+require 'vendor/autoload.php';
+
+use JiraRestApi\Board\BoardService;
+
+try {
+  $results = [];
+  $startAt = 0;
+  $maxResults = 50; // maximum allowed for board queries
+
+  do {
+      $response = $this->boardService->getBoards([
+        'startAt' => $startAt,
+        'maxResults' => $maxResults
+      ]);
+
+      $results = [...$results, ...$response->getBoards()];
+
+      $startAt += $maxResults;
+
+  } while($startAt < $response->total);
+  
+  var_dump($results);
+  
+} catch (JiraRestApi\JiraException $e) {
+    print('Error Occured! ' . $e->getMessage());
+}
+
+```
+
+
+
 #### Get board info
 [See Jira API reference](https://developer.atlassian.com/cloud/jira/software/rest/#api-rest-agile-1-0-board-boardId-get)
 
diff --git a/composer.json b/composer.json
index f3afe122..89cf5176 100644
--- a/composer.json
+++ b/composer.json
@@ -7,10 +7,8 @@
         "php": "^8.0",
         "ext-curl": "*",
         "ext-json": "*",
-        "netresearch/jsonmapper": "^3.0|^4.0|^5.0",
-        "monolog/monolog": "^2.0|^3.0"
-    },
-    "suggest": {
+        "netresearch/jsonmapper": "^4.2|^5.0",
+        "monolog/monolog": "^2.0|^3.0",
         "vlucas/phpdotenv": "^5.0|^6.0"
     },
     "require-dev": {
diff --git a/src/Auth/AuthService.php b/src/Auth/AuthService.php
index d28391af..8ed530fa 100644
--- a/src/Auth/AuthService.php
+++ b/src/Auth/AuthService.php
@@ -80,7 +80,7 @@ public function getSessionCookieValue()
      * @throws \Exception
      * @throws \JiraRestApi\JiraException
      */
-    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, $path = './')
+    public function __construct(?ConfigurationInterface $configuration = null, ?LoggerInterface $logger = null, $path = './')
     {
         parent::__construct($configuration, $logger, $path);
         $this->setAPIUri($this->auth_api_uri);
diff --git a/src/Board/BoardService.php b/src/Board/BoardService.php
index 07a94179..fb2c5352 100644
--- a/src/Board/BoardService.php
+++ b/src/Board/BoardService.php
@@ -14,7 +14,7 @@ class BoardService extends \JiraRestApi\JiraClient
 
     private $agileVersion = '1.0';
 
-    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, $path = './')
+    public function __construct(?ConfigurationInterface $configuration = null, ?LoggerInterface $logger = null, $path = './')
     {
         parent::__construct($configuration, $logger, $path);
         $this->setAPIUri('/rest/agile/'.$this->agileVersion);
@@ -46,6 +46,31 @@ public function getBoardList($paramArray = []): ?\ArrayObject
         }
     }
 
+    /**
+     * Get list of boards with paginated results.
+     *
+     * @param array $paramArray
+     *
+     * @throws \JiraRestApi\JiraException
+     *
+     * @return PaginatedResult|null array of Board class
+     */
+    public function getBoards($paramArray = []): ?PaginatedResult
+    {
+        $json = $this->exec($this->uri.$this->toHttpQueryParameter($paramArray), null);
+
+        try {
+            return $this->json_mapper->map(
+                json_decode($json, false, 512, $this->getJsonOptions()),
+                new PaginatedResult()
+            );
+        } catch (\JsonException $exception) {
+            $this->log->error("Response cannot be decoded from json\nException: {$exception->getMessage()}");
+
+            return null;
+        }
+    }
+
     public function getBoard($id, $paramArray = []): ?Board
     {
         $json = $this->exec($this->uri.'/'.$id.$this->toHttpQueryParameter($paramArray), null);
@@ -122,6 +147,31 @@ public function getBoardSprints($boardId, $paramArray = []): ?\ArrayObject
         }
     }
 
+    /**
+     * Get list of boards with paginated results.
+     *
+     * @param array $paramArray
+     *
+     * @throws \JiraRestApi\JiraException
+     *
+     * @return PaginatedResult|null array of Board class
+     */
+    public function getSprintsForBoard($boardId, $paramArray = []): ?PaginatedResult
+    {
+        $json = $this->exec($this->uri.'/'.$boardId.'/sprint'.$this->toHttpQueryParameter($paramArray), null);
+
+        try {
+            return $this->json_mapper->map(
+                json_decode($json, false, 512, $this->getJsonOptions()),
+                new PaginatedResult()
+            );
+        } catch (\JsonException $exception) {
+            $this->log->error("Response cannot be decoded from json\nException: {$exception->getMessage()}");
+
+            return null;
+        }
+    }
+
     /**
      * @return \ArrayObject|Epic[]|null
      */
diff --git a/src/Board/PaginatedResult.php b/src/Board/PaginatedResult.php
new file mode 100644
index 00000000..62f62f40
--- /dev/null
+++ b/src/Board/PaginatedResult.php
@@ -0,0 +1,129 @@
+<?php
+
+namespace JiraRestApi\Board;
+
+/**
+ * Paginated Result object for BoardService.
+ */
+class PaginatedResult
+{
+    /**
+     * @var string
+     */
+    public $expand;
+
+    /**
+     * @var int
+     */
+    public $startAt;
+
+    /**
+     * @var int
+     */
+    public $maxResults;
+
+    /**
+     * @var int
+     */
+    public $total;
+
+    /**
+     * @var array
+     */
+    public $values;
+
+    /**
+     * @var bool
+     */
+    public $isLast;
+
+    /**
+     * @return int
+     */
+    public function getStartAt()
+    {
+        return $this->startAt;
+    }
+
+    /**
+     * @param int $startAt
+     */
+    public function setStartAt($startAt)
+    {
+        $this->startAt = $startAt;
+    }
+
+    /**
+     * @return int
+     */
+    public function getMaxResults()
+    {
+        return $this->maxResults;
+    }
+
+    /**
+     * @param int $maxResults
+     */
+    public function setMaxResults($maxResults)
+    {
+        $this->maxResults = $maxResults;
+    }
+
+    /**
+     * @return int
+     */
+    public function getTotal()
+    {
+        return $this->total;
+    }
+
+    /**
+     * @param int $total
+     */
+    public function setTotal($total)
+    {
+        $this->total = $total;
+    }
+
+    /**
+     * @return array
+     */
+    public function getValues()
+    {
+        return $this->values;
+    }
+
+    /**
+     * @param array $values
+     */
+    public function setValues($values)
+    {
+        $this->values = $values;
+    }
+
+    /**
+     * @param int $index
+     *
+     * @return mixed
+     */
+    public function getValue($index)
+    {
+        return $this->values[$index];
+    }
+
+    /**
+     * @return string
+     */
+    public function getExpand()
+    {
+        return $this->expand;
+    }
+
+    /**
+     * @param string $expand
+     */
+    public function setExpand($expand)
+    {
+        $this->expand = $expand;
+    }
+}
diff --git a/src/Component/Component.php b/src/Component/Component.php
index 0efe298b..a5f42081 100644
--- a/src/Component/Component.php
+++ b/src/Component/Component.php
@@ -25,7 +25,7 @@ class Component implements \JsonSerializable
 
     public string $description;
 
-    public ?User $lead;
+    public ?User $lead = null;
 
     public string $leadUserName;
 
diff --git a/src/Configuration/AbstractConfiguration.php b/src/Configuration/AbstractConfiguration.php
index 993def43..603b28f9 100644
--- a/src/Configuration/AbstractConfiguration.php
+++ b/src/Configuration/AbstractConfiguration.php
@@ -64,6 +64,11 @@ abstract class AbstractConfiguration implements ConfigurationInterface
      */
     protected ?string $proxyPort = null;
 
+    /**
+     * Proxy type.
+     */
+    protected ?int $proxyType = null;
+
     /**
      * Proxy user.
      */
@@ -198,6 +203,11 @@ public function getProxyPort(): ?string
         return $this->proxyPort;
     }
 
+    public function getProxyType(): ?int
+    {
+        return $this->proxyType;
+    }
+
     public function getProxyUser(): ?string
     {
         return $this->proxyUser;
diff --git a/src/Configuration/ArrayConfiguration.php b/src/Configuration/ArrayConfiguration.php
index df0e6000..267568ba 100644
--- a/src/Configuration/ArrayConfiguration.php
+++ b/src/Configuration/ArrayConfiguration.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Created by PhpStorm.
  * User: keanor
diff --git a/src/Configuration/ConfigurationInterface.php b/src/Configuration/ConfigurationInterface.php
index 196360bc..0975de0c 100644
--- a/src/Configuration/ConfigurationInterface.php
+++ b/src/Configuration/ConfigurationInterface.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Created by PhpStorm.
  * User: keanor
@@ -96,6 +97,11 @@ public function getProxyServer(): ?string;
      */
     public function getProxyPort(): ?string;
 
+    /**
+     * Proxy type.
+     */
+    public function getProxyType(): ?int;
+
     /**
      * Proxy user.
      */
diff --git a/src/Configuration/DotEnvConfiguration.php b/src/Configuration/DotEnvConfiguration.php
index 0aae17d0..d26a469c 100644
--- a/src/Configuration/DotEnvConfiguration.php
+++ b/src/Configuration/DotEnvConfiguration.php
@@ -37,6 +37,7 @@ public function __construct(string $path = '.')
         $this->curlOptVerbose = $this->env('CURLOPT_VERBOSE', false);
         $this->proxyServer = $this->env('PROXY_SERVER');
         $this->proxyPort = $this->env('PROXY_PORT');
+        $this->proxyType = $this->env('PROXY_TYPE');
         $this->proxyUser = $this->env('PROXY_USER');
         $this->proxyPassword = $this->env('PROXY_PASSWORD');
 
diff --git a/src/Epic/EpicService.php b/src/Epic/EpicService.php
index 6213cca0..5b9df95e 100644
--- a/src/Epic/EpicService.php
+++ b/src/Epic/EpicService.php
@@ -11,7 +11,7 @@ class EpicService extends \JiraRestApi\JiraClient
     private $uri = '/epic';
     private $version = '1.0';
 
-    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, $path = './')
+    public function __construct(?ConfigurationInterface $configuration = null, ?LoggerInterface $logger = null, $path = './')
     {
         parent::__construct($configuration, $logger, $path);
         $this->setAPIUri('/rest/agile/'.$this->version);
diff --git a/src/Issue/AgileIssueService.php b/src/Issue/AgileIssueService.php
index 50ef5511..85bdfcd1 100644
--- a/src/Issue/AgileIssueService.php
+++ b/src/Issue/AgileIssueService.php
@@ -11,7 +11,7 @@ class AgileIssueService extends \JiraRestApi\JiraClient
 
     private $agileVersion = '1.0';
 
-    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, $path = './')
+    public function __construct(?ConfigurationInterface $configuration = null, ?LoggerInterface $logger = null, $path = './')
     {
         parent::__construct($configuration, $logger, $path);
         $this->setAPIUri('/rest/agile/'.$this->agileVersion);
diff --git a/src/Issue/Comment.php b/src/Issue/Comment.php
index b7b0b169..67b2577e 100644
--- a/src/Issue/Comment.php
+++ b/src/Issue/Comment.php
@@ -18,6 +18,9 @@ class Comment implements \JsonSerializable
     /** @var string */
     public $body;
 
+    /** @var string */
+    public $renderedBody;
+
     /** @var \JiraRestApi\Issue\Reporter */
     public $updateAuthor;
 
diff --git a/src/Issue/CustomField.php b/src/Issue/CustomField.php
new file mode 100644
index 00000000..3551c7b2
--- /dev/null
+++ b/src/Issue/CustomField.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace JiraRestApi\Issue;
+
+class CustomField implements \JsonSerializable
+{
+    public int $id;
+
+    public string $name;
+
+    public string $description;
+
+    public array $type;
+
+    public string $searcherKey;
+
+    public array $projectIds;
+
+    public array $issueTypeIds;
+
+    public string $self;
+
+    public int $numericId;
+
+    public bool $isLocked;
+
+    public bool $isManaged;
+
+    public bool $isAllProjects;
+
+    public bool $isTrusted;
+
+    public int $projectsCount;
+
+    public int $screensCount;
+
+    public function jsonSerialize(): mixed
+    {
+        return array_filter(get_object_vars($this));
+    }
+}
diff --git a/src/Issue/CustomFieldSearchResult.php b/src/Issue/CustomFieldSearchResult.php
new file mode 100644
index 00000000..5fac7a35
--- /dev/null
+++ b/src/Issue/CustomFieldSearchResult.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace JiraRestApi\Issue;
+
+class CustomFieldSearchResult implements \JsonSerializable
+{
+    public int $maxResults;
+
+    public int $startAt;
+
+    public int $total;
+
+    public bool $isLast;
+
+    /**
+     * @var array of CustomField
+     */
+    public array $values;
+
+    public function jsonSerialize(): mixed
+    {
+        return array_filter(get_object_vars($this));
+    }
+}
diff --git a/src/Issue/Issue.php b/src/Issue/Issue.php
index e6616ab0..2793be12 100644
--- a/src/Issue/Issue.php
+++ b/src/Issue/Issue.php
@@ -7,7 +7,7 @@ class Issue implements \JsonSerializable
     /**
      * return only if Project query by key(not id).
      */
-    public ?string $expand;
+    public ?string $expand = null;
 
     public string $self;
 
@@ -17,19 +17,19 @@ class Issue implements \JsonSerializable
 
     public IssueField $fields;
 
-    public ?array $renderedFields;
+    public ?array $renderedFields = null;
 
-    public ?array $names;
+    public ?array $names = null;
 
-    public ?array $schema;
+    public ?array $schema = null;
 
-    public ?array $transitions;
+    public ?array $transitions = null;
 
-    public ?array $operations;
+    public ?array $operations = null;
 
-    public ?array $editmeta;
+    public ?array $editmeta = null;
 
-    public ?ChangeLog $changelog;
+    public ?ChangeLog $changelog = null;
 
     #[\ReturnTypeWillChange]
     public function jsonSerialize(): array
diff --git a/src/Issue/IssueBulkResult.php b/src/Issue/IssueBulkResult.php
new file mode 100644
index 00000000..96debcd7
--- /dev/null
+++ b/src/Issue/IssueBulkResult.php
@@ -0,0 +1,82 @@
+<?php
+
+namespace JiraRestApi\Issue;
+
+/**
+ * Issue search result.
+ */
+class IssueBulkResult
+{
+    /**
+     * @var string
+     */
+    public $expand;
+
+    /**
+     * @var \JiraRestApi\Issue\Issue[]
+     */
+    public $issues;
+
+    /**
+     * @var array
+     */
+    public $issueErrors;
+
+    /**
+     * @return array
+     */
+    public function getIssueErrors()
+    {
+        return $this->issueErrors;
+    }
+
+    /**
+     * @param array $issueErrors
+     */
+    public function setIssueErrors($issueErrors)
+    {
+        $this->issueErrors = $issueErrors;
+    }
+
+    /**
+     * @return Issue[]
+     */
+    public function getIssues()
+    {
+        return $this->issues;
+    }
+
+    /**
+     * @param Issue[] $issues
+     */
+    public function setIssues($issues)
+    {
+        $this->issues = $issues;
+    }
+
+    /**
+     * @param int $ndx
+     *
+     * @return Issue
+     */
+    public function getIssue($ndx)
+    {
+        return $this->issues[$ndx];
+    }
+
+    /**
+     * @return string
+     */
+    public function getExpand()
+    {
+        return $this->expand;
+    }
+
+    /**
+     * @param string $expand
+     */
+    public function setExpand($expand)
+    {
+        $this->expand = $expand;
+    }
+}
diff --git a/src/Issue/IssueField.php b/src/Issue/IssueField.php
index 2b498b28..3a74424b 100644
--- a/src/Issue/IssueField.php
+++ b/src/Issue/IssueField.php
@@ -18,11 +18,11 @@ class IssueField implements \JsonSerializable
 
     public ?TimeTracking $timeTracking = null;
 
-    public ?IssueType $issuetype;
+    public ?IssueType $issuetype = null;
 
     public ?Reporter $reporter = null;
 
-    public ?DateTimeInterface $created;
+    public ?DateTimeInterface $created = null;
 
     public ?DateTimeInterface $updated = null;
 
@@ -36,7 +36,7 @@ class IssueField implements \JsonSerializable
 
     public Project $project;
 
-    public ?string $environment;
+    public ?string $environment = null;
 
     /* @var \JiraRestApi\Issue\Component[] This property must don't describe the type feature for JSON deserialized. */
     public $components;
@@ -45,15 +45,15 @@ class IssueField implements \JsonSerializable
 
     public object $votes;
 
-    public ?object $resolution;
+    public ?object $resolution = null;
 
-    public array $fixVersions;
+    public array $fixVersions = [];
 
-    public ?Reporter $creator;
+    public ?Reporter $creator = null;
 
-    public ?object $watches;
+    public ?object $watches = null;
 
-    public ?object $worklog;
+    public ?object $worklog = null;
 
     public ?Reporter $assignee = null;
 
@@ -63,13 +63,13 @@ class IssueField implements \JsonSerializable
     /** @var \JiraRestApi\Issue\Attachment[] */
     public $attachment;
 
-    public ?string $aggregatetimespent;
+    public ?string $aggregatetimespent = null;
 
-    public ?string $timeestimate;
+    public ?string $timeestimate = null;
 
-    public ?string $aggregatetimeoriginalestimate;
+    public ?string $aggregatetimeoriginalestimate = null;
 
-    public ?string $resolutiondate;
+    public ?string $resolutiondate = null;
 
     public ?DateTimeInterface $duedate = null;
 
@@ -82,20 +82,20 @@ class IssueField implements \JsonSerializable
 
     public int $workratio;
 
-    public ?object $aggregatetimeestimate;
+    public ?object $aggregatetimeestimate = null;
 
-    public ?object $aggregateprogress;
+    public ?object $aggregateprogress = null;
 
-    public ?object $lastViewed;
+    public ?object $lastViewed = null;
 
-    public ?object $timeoriginalestimate;
+    public ?object $timeoriginalestimate = null;
 
     /** @var object|null */
     public $parent;
 
-    public ?array $customFields;
+    public ?array $customFields = null;
 
-    public ?SecurityScheme $security;
+    public ?SecurityScheme $security = null;
 
     public function __construct($updateIssue = false)
     {
@@ -114,7 +114,7 @@ public function __construct($updateIssue = false)
     public function jsonSerialize(): mixed
     {
         $vars = array_filter(get_object_vars($this), function ($var) {
-            return !is_null($var);
+            return !empty($var);
         });
 
         // if assignee property has empty value then remove it.
@@ -150,7 +150,7 @@ public function getCustomFields(): ?array
         return $this->customFields;
     }
 
-    public function addCustomField(string $key, string|int|float|array $value): static
+    public function addCustomField(string $key, null|string|int|float|array $value): static
     {
         $this->customFields[$key] = $value;
 
@@ -355,7 +355,7 @@ public function setParentKeyOrId(string $keyOrId): static
         return $this;
     }
 
-    public function setParent(Issue $parent): void
+    public function setParent(?Issue $parent): void
     {
         $this->parent = $parent;
     }
diff --git a/src/Issue/IssueSearchResult.php b/src/Issue/IssueSearchResult.php
index 3c0cb70c..9b9fafad 100644
--- a/src/Issue/IssueSearchResult.php
+++ b/src/Issue/IssueSearchResult.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Created by PhpStorm.
  * User: keanor
@@ -13,10 +14,9 @@
  */
 class IssueSearchResult
 {
-    /**
-     * @var string
-     */
-    public $expand;
+    public ?string $nextPageToken = null;
+
+    public ?string $expand = null;
 
     /**
      * @var int
@@ -41,49 +41,17 @@ class IssueSearchResult
     /**
      * @return int
      */
-    public function getStartAt()
-    {
-        return $this->startAt;
-    }
-
-    /**
-     * @param int $startAt
-     */
-    public function setStartAt($startAt)
-    {
-        $this->startAt = $startAt;
-    }
-
-    /**
-     * @return int
-     */
-    public function getMaxResults()
-    {
-        return $this->maxResults;
-    }
-
-    /**
-     * @param int $maxResults
-     */
-    public function setMaxResults($maxResults)
-    {
-        $this->maxResults = $maxResults;
-    }
-
-    /**
-     * @return int
-     */
-    public function getTotal()
+    public function getNextPageToken()
     {
-        return $this->total;
+        return $this->nextPageToken;
     }
 
     /**
-     * @param int $total
+     * @param string $nextPageToken
      */
-    public function setTotal($total)
+    public function setNextPageToken($nextPageToken)
     {
-        $this->total = $total;
+        $this->nextPageToken = $nextPageToken;
     }
 
     /**
@@ -113,17 +81,14 @@ public function getIssue($ndx)
     }
 
     /**
-     * @return string
+     * @return ?string
      */
-    public function getExpand()
+    public function getExpand(): ?string
     {
         return $this->expand;
     }
 
-    /**
-     * @param string $expand
-     */
-    public function setExpand($expand)
+    public function setExpand(?string $expand)
     {
         $this->expand = $expand;
     }
diff --git a/src/Issue/IssueService.php b/src/Issue/IssueService.php
index 82df01a2..15dd07e8 100644
--- a/src/Issue/IssueService.php
+++ b/src/Issue/IssueService.php
@@ -534,21 +534,22 @@ public function transition($issueIdOrKey, $transition): ?string
      *
      * @return IssueSearchResult
      */
-    public function search(string $jql, int $startAt = 0, int $maxResults = 15, array $fields = [], array $expand = [], bool $validateQuery = true): IssueSearchResult
+    public function search(string $jql, string $nextPageToken = '', int $maxResults = 50, array $fields = [], string $expand = '', array $reconcileIssues = []): IssueSearchResult
     {
-        $data = json_encode([
-            'jql'           => $jql,
-            'startAt'       => $startAt,
-            'maxResults'    => $maxResults,
-            'fields'        => $fields,
-            'expand'        => $expand,
-            'validateQuery' => $validateQuery,
-        ]);
+        $data = [
+            'jql'             => $jql,
+            'maxResults'      => $maxResults,
+            'fields'          => $fields,
+            'expand'          => $expand,
+            'reconcileIssues' => $reconcileIssues,
+        ];
 
-        $ret = $this->exec('search', $data, 'POST');
-        $json = json_decode($ret);
+        if ($nextPageToken) {
+            $data['nextPageToken'] = $nextPageToken;
+        }
 
-        $result = null;
+        $ret = $this->exec('search/jql', json_encode($data), 'POST');
+        $json = json_decode($ret);
 
         $result = $this->json_mapper->map(
             $json,
@@ -558,6 +559,33 @@ public function search(string $jql, int $startAt = 0, int $maxResults = 15, arra
         return $result;
     }
 
+    /**
+     * Get an approximate count of issues that match a JQL query.
+     *
+     * @param string $jql The JQL query string
+     *
+     * @throws \JsonMapper_Exception
+     * @throws JiraException
+     *
+     * @return JQLCountResult
+     */
+    public function searchApproximateCount(string $jql): JQLCountResult
+    {
+        $data = [
+            'jql' => $jql,
+        ];
+
+        $ret = $this->exec('search/approximate-count', json_encode($data), 'POST');
+        $json = json_decode($ret);
+
+        $result = $this->json_mapper->map(
+            $json,
+            new JQLCountResult()
+        );
+
+        return $result;
+    }
+
     /**
      * get TimeTracking info.
      *
@@ -700,6 +728,26 @@ public function getWorklogById(string $issueIdOrKey, int $workLogId): Worklog
         );
     }
 
+    /**
+     * @param array<int> $ids
+     *
+     * @return array<Worklog>
+     */
+    public function getWorklogsByIds(array $ids): array
+    {
+        $ret = $this->exec('/worklog/list', json_encode(['ids' => $ids]), 'POST');
+
+        $this->log->debug("getWorklogsByIds res=$ret\n");
+
+        $worklogsResponse = json_decode($ret, false, 512, JSON_THROW_ON_ERROR);
+
+        $worklogs = array_map(function ($worklog) {
+            return $this->json_mapper->map($worklog, new Worklog());
+        }, $worklogsResponse);
+
+        return $worklogs;
+    }
+
     /**
      * add work log to issue.
      *
@@ -822,22 +870,26 @@ public function getPriority(int $priorityId): Priority
      * Get priority by id.
      * throws HTTPException if the priority is not found, or the calling user does not have permission or view it.
      *
-     * @param int $priorityId Id of priority.
+     * @param $paramArray array parameters
      *
      * @throws \JsonMapper_Exception
      * @throws JiraException
      *
-     * @return Priority priority
+     * @return CustomFieldSearchResult array of CustomeFiled
+     *
+     * @see https://docs.atlassian.com/software/jira/docs/api/REST/9.14.0/#api/2/customFields-getCustomFields
      */
-    public function getCustomFields(int $priorityId): Priority
+    public function getCustomFields(array $paramArray = []): CustomFieldSearchResult
     {
-        $ret = $this->exec("priority/$priorityId", null);
+        $ret = $this->exec('customFields'.$this->toHttpQueryParameter($paramArray), null);
 
         $this->log->info('Result='.$ret);
 
+        //\JiraRestApi\Dumper::dd(json_decode($ret, false));
+
         return $this->json_mapper->map(
-            json_decode($ret),
-            new Priority()
+            json_decode($ret, false),
+            new CustomFieldSearchResult()
         );
     }
 
diff --git a/src/Issue/IssueType.php b/src/Issue/IssueType.php
index 5c3b83dd..ce38adb7 100644
--- a/src/Issue/IssueType.php
+++ b/src/Issue/IssueType.php
@@ -8,7 +8,7 @@ class IssueType implements \JsonSerializable
 
     public string $id;
 
-    public ?string $description;
+    public ?string $description = null;
 
     public string $iconUrl;
 
diff --git a/src/Issue/JQLCountResult.php b/src/Issue/JQLCountResult.php
new file mode 100644
index 00000000..aa748028
--- /dev/null
+++ b/src/Issue/JQLCountResult.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace JiraRestApi\Issue;
+
+/**
+ * JQL Count result for approximate count API.
+ */
+class JQLCountResult implements \JsonSerializable
+{
+    /**
+     * @var int The approximate count of issues matching the JQL query
+     */
+    public int $count;
+
+    /**
+     * Get the count of issues.
+     *
+     * @return int
+     */
+    public function getCount(): int
+    {
+        return $this->count;
+    }
+
+    /**
+     * Set the count of issues.
+     *
+     * @param int $count
+     */
+    public function setCount(int $count): void
+    {
+        $this->count = $count;
+    }
+
+    #[\ReturnTypeWillChange]
+    public function jsonSerialize(): array
+    {
+        return [
+            'count' => $this->count,
+        ];
+    }
+}
diff --git a/src/Issue/Reporter.php b/src/Issue/Reporter.php
index e4d5020f..7322c858 100644
--- a/src/Issue/Reporter.php
+++ b/src/Issue/Reporter.php
@@ -14,9 +14,9 @@ class Reporter implements \JsonSerializable
 
     public string $self;
 
-    public ?string $name;
+    public ?string $name = null;
 
-    public ?string $emailAddress;
+    public ?string $emailAddress = null;
 
     public array $avatarUrls;
 
diff --git a/src/Issue/TimeTracking.php b/src/Issue/TimeTracking.php
index cc9ec806..bf338da8 100644
--- a/src/Issue/TimeTracking.php
+++ b/src/Issue/TimeTracking.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Created by PhpStorm.
  * User: keanor
diff --git a/src/Issue/Version.php b/src/Issue/Version.php
index eb3b23a6..30b57ed1 100644
--- a/src/Issue/Version.php
+++ b/src/Issue/Version.php
@@ -11,27 +11,27 @@ class Version implements \JsonSerializable
     public string $id;
 
     // Version name: ex: 4.2.3
-    public ?string $name;
+    public string $name;
 
     // version description: ex; improvement performance
-    public ?string $description;
+    public ?string $description = null;
 
     public bool $archived;
 
     public bool $released;
 
-    public string $releaseDate;
+    public ?string $releaseDate = null;
 
-    public bool $overdue;
+    public bool $overdue = false;
 
-    public ?string $userReleaseDate;
+    public ?string $userReleaseDate = null;
 
     public int $projectId;
 
-    public ?string $startDate;
-    public ?string $userStartDate;
+    public ?string $startDate = null;
+    public ?string $userStartDate = null;
 
-    public function __construct($name = null)
+    public function __construct(string $name)
     {
         $this->name = $name;
     }
diff --git a/src/JiraClient.php b/src/JiraClient.php
index fd2ee408..02a7dd52 100644
--- a/src/JiraClient.php
+++ b/src/JiraClient.php
@@ -59,7 +59,7 @@ class JiraClient
      *
      * @throws JiraException
      */
-    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, string $path = './')
+    public function __construct(?ConfigurationInterface $configuration = null, ?LoggerInterface $logger = null, string $path = './')
     {
         if ($configuration === null) {
             if (!file_exists($path.'.env')) {
@@ -73,12 +73,22 @@ public function __construct(ConfigurationInterface $configuration = null, Logger
 
         $this->json_mapper = new \JsonMapper();
 
+        // Adjust settings for JsonMapper v5.0 BC
+        if (property_exists($this->json_mapper, 'bStrictNullTypesInArrays')) {
+            $this->json_mapper->bStrictNullTypesInArrays = false; // if you want to allow nulls in arrays
+        }
+        $this->json_mapper->bStrictNullTypes = false; // if you want to allow nulls
+        $this->json_mapper->bStrictObjectTypeChecking = false; // if you want to disable strict type checking
+
         // Fix "\JiraRestApi\JsonMapperHelper::class" syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$'
         $this->json_mapper->undefinedPropertyHandler = [new \JiraRestApi\JsonMapperHelper(), 'setUndefinedProperty'];
 
         // Properties that are annotated with `@var \DateTimeInterface` should result in \DateTime objects being created.
         $this->json_mapper->classMap['\\'.\DateTimeInterface::class] = \DateTime::class;
 
+        // Just class mapping is not enough, bStrictObjectTypeChecking must be set to false.
+        $this->json_mapper->bStrictObjectTypeChecking = false;
+
         // create logger
         if ($this->configuration->getJiraLogEnabled()) {
             if ($logger) {
@@ -185,7 +195,7 @@ protected function filterNullVariable(array $haystack): array
      *
      * @return string|bool
      */
-    public function exec(string $context, array|string $post_data = null, string $custom_request = null, string $cookieFile = null): string|bool
+    public function exec(string $context, array|string|null $post_data = null, ?string $custom_request = null, ?string $cookieFile = null): string|bool
     {
         $url = $this->createUrlByContext($context);
 
@@ -195,29 +205,7 @@ public function exec(string $context, array|string $post_data = null, string $cu
             $this->log->info("Curl $custom_request: $url JsonData=".json_encode($post_data, JSON_UNESCAPED_UNICODE));
         }
 
-        curl_reset($this->curl);
-        $ch = $this->curl;
-        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($ch, CURLOPT_URL, $url);
-
-        // post_data
-        if (!is_null($post_data)) {
-            // PUT REQUEST
-            if (!is_null($custom_request) && $custom_request == 'PUT') {
-                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
-                curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
-            }
-            if (!is_null($custom_request) && $custom_request == 'DELETE') {
-                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
-            } else {
-                curl_setopt($ch, CURLOPT_POST, true);
-                curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
-            }
-        } else {
-            if (!is_null($custom_request) && $custom_request == 'DELETE') {
-                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
-            }
-        }
+        $ch = $this->prepareCurlRequest($url, $post_data, $custom_request);
 
         // save HTTP Headers
         $curl_http_headers = [
@@ -236,7 +224,8 @@ public function exec(string $context, array|string $post_data = null, string $cu
             curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
         }
 
-        curl_setopt($ch, CURLOPT_ENCODING, '');
+        // remove for avoid https://github.com/php/php-src/issues/14184
+        //curl_setopt($ch, CURLOPT_ENCODING, '');
 
         curl_setopt(
             $ch,
@@ -435,7 +424,7 @@ protected function createUrlByContext(string $context): string
     /**
      * Add authorize to curl request.
      */
-    protected function authorization(\CurlHandle $ch, array &$curl_http_headers, string $cookieFile = null): void
+    protected function authorization(\CurlHandle $ch, array &$curl_http_headers, ?string $cookieFile = null): void
     {
         // use cookie
         if ($this->getConfiguration()->isCookieAuthorizationEnabled()) {
@@ -484,11 +473,14 @@ public function setAPIUri(string $api_uri): string
     /**
      * convert to query array to http query parameter.
      */
-    public function toHttpQueryParameter(array $paramArray): string
+    public function toHttpQueryParameter(array $paramArray, bool $dropNullKey = true): string
     {
         $queryParam = '?';
 
         foreach ($paramArray as $key => $value) {
+            if ($dropNullKey === true && empty($value)) {
+                continue;
+            }
             $v = null;
 
             // some param field(Ex: expand) type is array.
@@ -507,7 +499,7 @@ public function toHttpQueryParameter(array $paramArray): string
     /**
      * download and save into outDir.
      */
-    public function download(string $url, string $outDir, string $file, string $cookieFile = null): mixed
+    public function download(string $url, string $outDir, string $file, ?string $cookieFile = null): mixed
     {
         $curl_http_header = [
             'Accept: */*',
@@ -605,6 +597,42 @@ private function proxyConfigCurlHandle(\CurlHandle $ch): void
             $password = $this->getConfiguration()->getProxyPassword();
             curl_setopt($ch, CURLOPT_PROXYUSERPWD, "$username:$password");
         }
+
+        // Set the proxy type for curl, default is CURLPROXY_HTTP (0)
+        if ($this->getConfiguration()->getProxyType()) {
+            curl_setopt($ch, CURLOPT_PROXYTYPE, $this->getConfiguration()->getProxyType());
+        }
+    }
+
+    private function prepareCurlRequest(string $url, array|string|null $post_data = null, ?string $custom_request = null)
+    {
+        curl_reset($this->curl);
+        $ch = $this->curl;
+        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->configuration->getTimeout());
+        curl_setopt($ch, CURLOPT_TIMEOUT, $this->configuration->getTimeout());
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($ch, CURLOPT_URL, $url);
+
+        // post_data
+        if (!is_null($post_data)) {
+            // PUT REQUEST
+            if (!is_null($custom_request) && $custom_request == 'PUT') {
+                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
+                curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
+            }
+            if (!is_null($custom_request) && $custom_request == 'DELETE') {
+                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
+            } else {
+                curl_setopt($ch, CURLOPT_POST, true);
+                curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
+            }
+        } else {
+            if (!is_null($custom_request) && $custom_request == 'DELETE') {
+                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
+            }
+        }
+
+        return $ch;
     }
 
     /**
diff --git a/src/JiraException.php b/src/JiraException.php
index db14260d..d838a725 100644
--- a/src/JiraException.php
+++ b/src/JiraException.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Created by PhpStorm.
  * User: keanor
@@ -23,7 +24,7 @@ class JiraException extends \Exception
     /**
      * Create a new Jira exception instance.
      */
-    public function __construct(?string $message = null, int $code = 0, \Throwable $previous = null, string $response = null)
+    public function __construct(?string $message = null, int $code = 0, ?\Throwable $previous = null, ?string $response = null)
     {
         parent::__construct($message, $code, $previous);
 
diff --git a/src/JsonMapperHelper.php b/src/JsonMapperHelper.php
index 355867f5..4f736bdc 100644
--- a/src/JsonMapperHelper.php
+++ b/src/JsonMapperHelper.php
@@ -21,7 +21,7 @@ public static function setUndefinedProperty($object, $propName, $jsonValue)
                 $object->{$propName} = $jsonValue;
                 $object->customFields[$propName] = $jsonValue;
             }
-        } else {
+        } elseif (isset($object->{$propName})) {
             $object->{$propName} = $jsonValue;
         }
     }
diff --git a/src/Project/Project.php b/src/Project/Project.php
index e66db698..8f8b3cf8 100644
--- a/src/Project/Project.php
+++ b/src/Project/Project.php
@@ -28,7 +28,7 @@ class Project implements \JsonSerializable
     /**
      * Project key.
      */
-    public ?string $key;
+    public ?string $key = null;
 
     /**
      * Project name.
@@ -73,17 +73,17 @@ class Project implements \JsonSerializable
      */
     public $issueTypes;
 
-    public ?string $assigneeType;
+    public ?string $assigneeType = null;
 
     public ?array $versions = [];
 
-    public ?array $roles;
+    public ?array $roles = null;
 
     public string $url;
 
     public string $projectTypeKey;
 
-    public ?string $projectTemplateKey;
+    public ?string $projectTemplateKey = null;
 
     public int $avatarId;
 
diff --git a/src/Project/ProjectService.php b/src/Project/ProjectService.php
index 997cf650..10da92cf 100644
--- a/src/Project/ProjectService.php
+++ b/src/Project/ProjectService.php
@@ -65,7 +65,7 @@ public function get($projectIdOrKey): Project
      *
      * @param int|string $projectIdOrKey Project Key
      *
-     *@throws \JiraRestApi\JiraException
+     * @throws \JiraRestApi\JiraException
      *
      * @return Reporter[]
      */
@@ -83,7 +83,7 @@ public function getAssignable(int|string $projectIdOrKey): array
     /**
      * @param int|string $projectIdOrKey
      *
-     *@throws \JiraRestApi\JiraException
+     * @throws \JiraRestApi\JiraException
      *
      * @return IssueType[]
      */
@@ -103,7 +103,7 @@ public function getStatuses(int|string $projectIdOrKey): array
      *
      * @param int|string $projectIdOrKey
      *
-     *@throws \JiraRestApi\JiraException
+     * @throws \JiraRestApi\JiraException
      *
      * @return \JiraRestApi\Component\Component[]
      */
@@ -123,7 +123,7 @@ public function getProjectComponents(int|string $projectIdOrKey): array
      *
      * @param int|string $projectIdOrKey
      *
-     *@throws JiraException
+     * @throws JiraException
      *
      * @return array
      * @return array
@@ -174,7 +174,7 @@ public function getProjectTypes(): array
     /**
      * @param int|string $key
      *
-     *@throws \JsonMapper_Exception
+     * @throws \JsonMapper_Exception
      * @throws \JiraRestApi\JiraException
      *
      * @return ProjectType
@@ -196,7 +196,7 @@ public function getProjectType(int|string $key): ProjectType
     /**
      * @param int|string $key
      *
-     *@throws \JsonMapper_Exception
+     * @throws \JsonMapper_Exception
      * @throws \JiraRestApi\JiraException
      *
      * @return ProjectType
@@ -221,7 +221,7 @@ public function getAccessibleProjectType(int|string $key): ProjectType
      * @param int|string $projectIdOrKey
      * @param array      $queryParam
      *
-     *@throws \JiraRestApi\JiraException
+     * @throws \JiraRestApi\JiraException
      *
      * @return Version[] array of version
      */
@@ -279,7 +279,7 @@ public function getVersions(string $projectIdOrKey): \ArrayObject
      * @param int|string $projectIdOrKey
      * @param string     $versionName
      *
-     *@throws \JiraRestApi\JiraException
+     * @throws \JiraRestApi\JiraException
      *
      * @return Version version
      */
@@ -335,7 +335,7 @@ public function createProject(Project $project): Project
      *
      * @param Project $project
      *
-     *@throws \JsonMapper_Exception
+     * @throws \JsonMapper_Exception
      * @throws JiraException
      *
      * @return Project
@@ -357,7 +357,7 @@ public function updateProject(Project $project, string|int $projectIdOrKey): Pro
     /**
      * @param int|string $projectIdOrKey
      *
-     *@throws JiraException
+     * @throws JiraException
      *
      * @return string response status
      *
@@ -378,7 +378,7 @@ public function deleteProject(int|string $projectIdOrKey): string
      *
      * @param int|string $projectIdOrKey
      *
-     *@throws JiraException
+     * @throws JiraException
      *
      * @return string response status
      *
diff --git a/src/RapidCharts/ScopeChangeBurnDownChartService.php b/src/RapidCharts/ScopeChangeBurnDownChartService.php
index 3d065269..63409e76 100644
--- a/src/RapidCharts/ScopeChangeBurnDownChartService.php
+++ b/src/RapidCharts/ScopeChangeBurnDownChartService.php
@@ -12,7 +12,7 @@ class ScopeChangeBurnDownChartService extends \JiraRestApi\JiraClient
 
     private $uri = '/rapid/charts/scopechangeburndownchart';
 
-    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, $path = './')
+    public function __construct(?ConfigurationInterface $configuration = null, ?LoggerInterface $logger = null, $path = './')
     {
         parent::__construct($configuration, $logger, $path);
         $this->setupAPIUri();
diff --git a/src/Request/RequestService.php b/src/Request/RequestService.php
index 0db86d6e..47b65019 100644
--- a/src/Request/RequestService.php
+++ b/src/Request/RequestService.php
@@ -23,7 +23,7 @@ class RequestService extends \JiraRestApi\JiraClient
      * @throws JiraException
      * @throws \Exception
      */
-    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, $path = './')
+    public function __construct(?ConfigurationInterface $configuration = null, ?LoggerInterface $logger = null, $path = './')
     {
         parent::__construct($configuration, $logger, $path);
         $this->setupAPIUri();
diff --git a/src/ServiceDesk/Customer/Customer.php b/src/ServiceDesk/Customer/Customer.php
index ffc6057a..9c6036d1 100644
--- a/src/ServiceDesk/Customer/Customer.php
+++ b/src/ServiceDesk/Customer/Customer.php
@@ -20,7 +20,7 @@ class Customer implements JsonSerializable
     public string $displayName;
     public bool $active;
     public string $timeZone;
-    public ?CustomerLinks $_links;
+    public ?CustomerLinks $_links = null;
     public string $self;
 
     public function setLinks($links): void
diff --git a/src/ServiceDesk/Request/Request.php b/src/ServiceDesk/Request/Request.php
index 3476520a..bc86923d 100644
--- a/src/ServiceDesk/Request/Request.php
+++ b/src/ServiceDesk/Request/Request.php
@@ -125,6 +125,13 @@ private function map(object $data, object $target)
     {
         $mapper = new JsonMapper();
 
+        // Adjust settings for JsonMapper v5.0 BC
+        if (property_exists($mapper, 'bStrictNullTypesInArrays')) {
+            $mapper->bStrictNullTypesInArrays = false; // if you want to allow nulls in arrays
+        }
+        $mapper->bStrictNullTypes = false; // if you want to allow nulls
+        $mapper->bStrictObjectTypeChecking = false; // if you want to disable strict type checking
+
         return $mapper->map(
             $data,
             $target
diff --git a/src/ServiceDesk/Request/RequestService.php b/src/ServiceDesk/Request/RequestService.php
index 37b419a2..ddae9f17 100644
--- a/src/ServiceDesk/Request/RequestService.php
+++ b/src/ServiceDesk/Request/RequestService.php
@@ -65,7 +65,7 @@ public function getRequestFromJSON(object $jsonData): Request
      *
      * @see https://docs.atlassian.com/jira-servicedesk/REST/3.6.2/#servicedeskapi/request-getCustomerRequestByIdOrKey
      */
-    public function get(string $issueId, array $expandParameters = [], Request $request = null): Request
+    public function get(string $issueId, array $expandParameters = [], ?Request $request = null): Request
     {
         $request = ($request) ?: new Request();
 
@@ -88,7 +88,7 @@ public function get(string $issueId, array $expandParameters = [], Request $requ
      *
      * @see https://docs.atlassian.com/jira-servicedesk/REST/3.6.2/#servicedeskapi/request-getMyCustomerRequests
      */
-    public function getRequestsByCustomer(Customer $customer, array $searchParameters, int $serviceDeskId = null): array
+    public function getRequestsByCustomer(Customer $customer, array $searchParameters, ?int $serviceDeskId = null): array
     {
         $defaultSearchParameters = [
             'requestOwnership' => 'OWNED_REQUESTS',
@@ -427,6 +427,26 @@ public function getWorklogById(string $issueIdOrKey, int $workLogId): Worklog
         );
     }
 
+    /**
+     * @param array<int> $ids
+     *
+     * @return array<Worklog>
+     */
+    public function getWorklogsByIds(array $ids): array
+    {
+        $ret = $this->client->exec('/worklog/list', json_encode(['ids' => $ids]), 'POST');
+
+        $this->logger->debug("getWorklogsByIds res=$ret\n");
+
+        $worklogsResponse = json_decode($ret, false, 512, JSON_THROW_ON_ERROR);
+
+        $worklogs = array_map(function ($worklog) {
+            return $this->jsonMapper->map($worklog, new Worklog());
+        }, $worklogsResponse);
+
+        return $worklogs;
+    }
+
     /**
      * add work log to issue.
      *
diff --git a/src/ServiceDesk/ServiceDeskClient.php b/src/ServiceDesk/ServiceDeskClient.php
index 579dcaab..d8809cfe 100644
--- a/src/ServiceDesk/ServiceDeskClient.php
+++ b/src/ServiceDesk/ServiceDeskClient.php
@@ -12,8 +12,8 @@
 class ServiceDeskClient extends JiraClient
 {
     public function __construct(
-        ConfigurationInterface $configuration = null,
-        LoggerInterface $logger = null,
+        ?ConfigurationInterface $configuration = null,
+        ?LoggerInterface $logger = null,
         string $path = './'
     ) {
         parent::__construct($configuration, $logger, $path);
diff --git a/src/Sprint/Sprint.php b/src/Sprint/Sprint.php
index d0c69732..15020883 100644
--- a/src/Sprint/Sprint.php
+++ b/src/Sprint/Sprint.php
@@ -4,7 +4,6 @@
 
 namespace JiraRestApi\Sprint;
 
-use DateTimeInterface;
 use JiraRestApi\JsonSerializableTrait;
 
 class Sprint implements \JsonSerializable
@@ -29,8 +28,12 @@ class Sprint implements \JsonSerializable
 
     public string $originBoardId;
 
+    public string $createdDate;
+
     public string $goal;
 
+    public array $issues;
+
     public function setNameAsString(string $sprintName): self
     {
         $this->name = $sprintName;
@@ -52,17 +55,38 @@ public function setOriginBoardIdAsStringOrInt(string|int $originBoardId): self
         return $this;
     }
 
-    public function setStartDateAsDateTime(DateTimeInterface $startDate, $format = 'Y-m-d'): static
+    public function setStartDateAsDateTime(\DateTimeInterface $startDate, string $format = 'Y-m-d'): static
     {
         $this->startDate = $startDate->format($format);
 
         return $this;
     }
 
-    public function setEndDateAsDateTime(DateTimeInterface $endDate, $format = 'Y-m-d'): static
+    public function setStartDateAsString(string $startDate): static
+    {
+        $this->startDate = $startDate;
+
+        return $this;
+    }
+
+    public function setEndDateAsDateTime(\DateTimeInterface $endDate, string $format = 'Y-m-d'): static
     {
         $this->endDate = $endDate->format($format);
 
         return $this;
     }
+
+    public function setEndDateAsString(string $endDate): static
+    {
+        $this->endDate = $endDate;
+
+        return $this;
+    }
+
+    public function setMoveIssues(array $issues): static
+    {
+        $this->issues = $issues;
+
+        return $this;
+    }
 }
diff --git a/src/Sprint/SprintSearchResult.php b/src/Sprint/SprintSearchResult.php
index 3c36d524..7d5611de 100644
--- a/src/Sprint/SprintSearchResult.php
+++ b/src/Sprint/SprintSearchResult.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Created by PhpStorm.
  * User: keanor
diff --git a/src/Sprint/SprintService.php b/src/Sprint/SprintService.php
index c2e6bb23..c98f8a6e 100644
--- a/src/Sprint/SprintService.php
+++ b/src/Sprint/SprintService.php
@@ -14,7 +14,7 @@ class SprintService extends JiraClient
 {
     private $uri = '/sprint';
 
-    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, $path = './')
+    public function __construct(?ConfigurationInterface $configuration = null, ?LoggerInterface $logger = null, $path = './')
     {
         parent::__construct($configuration, $logger, $path);
         $this->setAPIUri('/rest/agile/1.0');
@@ -79,4 +79,18 @@ public function createSprint(Sprint $sprint): Sprint
             new Sprint()
         );
     }
+
+    /**
+     * @see https://docs.atlassian.com/jira-software/REST/9.11.0/#agile/1.0/sprint-moveIssuesToSprint
+     */
+    public function moveIssues2Sprint(int $sprintId, Sprint $sprint): bool
+    {
+        $data = json_encode($sprint);
+
+        $ret = $this->exec($this->uri.'/'.$sprintId.'/issue', $data);
+
+        $this->log->debug('moveIssues2Sprint result='.var_export($ret, true));
+
+        return $ret;
+    }
 }
diff --git a/src/User/UserService.php b/src/User/UserService.php
index b5b4a19f..21db9704 100644
--- a/src/User/UserService.php
+++ b/src/User/UserService.php
@@ -65,7 +65,7 @@ public function get(array $paramArray): User
      *
      * @param array $paramArray
      *
-     *@throws \JsonMapper_Exception
+     * @throws \JsonMapper_Exception
      * @throws \JiraRestApi\JiraException
      *
      * @return User[]
@@ -198,7 +198,7 @@ public function getMyself(): User
     /**
      * @param array $paramArray
      *
-     *@throws \JsonMapper_Exception
+     * @throws \JsonMapper_Exception
      * @throws \JiraRestApi\JiraException
      *
      * @return User[]
diff --git a/src/Version/VersionService.php b/src/Version/VersionService.php
index 17512e6b..fee0ab48 100644
--- a/src/Version/VersionService.php
+++ b/src/Version/VersionService.php
@@ -35,7 +35,7 @@ public function create($version)
 
         return $this->json_mapper->map(
             json_decode($ret),
-            new Version()
+            Version::class
         );
     }
 
@@ -71,7 +71,7 @@ public function get(string $id)
 
         return $this->json_mapper->map(
             json_decode($ret),
-            new Version()
+            Version::class
         );
     }
 
@@ -100,7 +100,7 @@ public function update(Version $version): Version
 
         return $this->json_mapper->map(
             json_decode($ret),
-            new Version()
+            Version::class
         );
     }
 
diff --git a/test-data/reporter-no-email-address.json b/test-data/reporter-no-email-address.json
new file mode 100644
index 00000000..b3a05a60
--- /dev/null
+++ b/test-data/reporter-no-email-address.json
@@ -0,0 +1,16 @@
+{
+    "reporter": {
+        "self": "https://jira.example.com/rest/api/2/user?username=lesstif",
+        "name": "lesstif",
+        "key": "lesstif",
+        "avatarUrls": {
+            "48x48": "https://secure.gravatar.com/avatar/9f1705ef1d8c977eba04f00556e02922?d=mm&s=48",
+            "24x24": "https://secure.gravatar.com/avatar/9f1705ef1d8c977eba04f00556e02922?d=mm&s=24",
+            "16x16": "https://secure.gravatar.com/avatar/9f1705ef1d8c977eba04f00556e02922?d=mm&s=16",
+            "32x32": "https://secure.gravatar.com/avatar/9f1705ef1d8c977eba04f00556e02922?d=mm&s=32"
+        },
+        "displayName": "정광섭",
+        "active": true,
+        "timeZone": "Asia/Seoul"
+    }
+}
\ No newline at end of file
diff --git a/tests/BoardTest.php b/tests/BoardTest.php
index 4eac9308..76aa113f 100644
--- a/tests/BoardTest.php
+++ b/tests/BoardTest.php
@@ -41,6 +41,31 @@ public function get_all_boards() : string
         return $last_board_id;
     }
 
+    /**
+     * @test
+     *
+     * Test we can obtain the paginated board list.
+     */
+    public function get_boards() : string
+    {
+        $board_service = new BoardService();
+
+        $board_list = $board_service->getBoards();
+        $this->assertInstanceOf(BoardResult::class, $board_list, 'We receive a board list.');
+
+        $last_board_id = null;
+        foreach ($board_list->getBoards() as $board) {
+            $this->assertInstanceOf(Board::class, $board, 'Each element of the list is a Board instance.');
+            $this->assertNotNull($board->self, 'self must not null');
+            $this->assertNotNull($board->name, 'name must not null');
+            $this->assertNotNull($board->type, 'type must not null');
+
+            $last_board_id = $board->id;
+        }
+
+        return $last_board_id;
+    }
+
     /**
      * @test
      *
diff --git a/tests/CustomFieldsTest.php b/tests/CustomFieldsTest.php
index c0818f2b..400b262a 100644
--- a/tests/CustomFieldsTest.php
+++ b/tests/CustomFieldsTest.php
@@ -2,6 +2,7 @@
 
 namespace JiraRestApi\Test;
 
+use JiraRestApi\Issue\IssueService;
 use PHPUnit\Framework\TestCase;
 use JiraRestApi\Dumper;
 use JiraRestApi\Field\Field;
@@ -10,6 +11,37 @@
 
 class CustomFieldsTest extends TestCase
 {
+    /**
+     * @Test
+     *
+     * @return array|string[]|void
+     */
+    public function get_customer_field()
+    {
+        try {
+            $iss = new IssueService();
+
+            $paramArray = [
+                'startAt' => 1,
+                'maxResults' => 50,
+                'search' => null,
+                'projectIds' => [1, 2, 3],
+                'screenIds' => null,
+                'types' => null,
+
+                'sortOrder' => null,
+                'sortColumn' => null,
+                'lastValueUpdate' => null,
+            ];
+            $customerFieldSearchResult = $iss->getCustomFields($paramArray);
+
+            $this->assertLessThan(1, $customerFieldSearchResult->total);
+
+        } catch (JiraException $e) {
+            $this->assertTrue(false, 'testSearch Failed : '.$e->getMessage());
+        }
+    }
+
     public function testGetFields()
     {
         try {
@@ -26,6 +58,7 @@ public function testGetFields()
                     return $matches[0];
                 }, $ret);
 
+            $this->assertTrue(true);
             return $ids;
 
         } catch (JiraException $e) {
@@ -49,6 +82,7 @@ public function testGetFieldOptions($ids)
                     Dumper::dump($ret);
                 }catch (JiraException $e) {}
             }
+            $this->assertTrue(true);
         } catch (JiraException $e) {
             $this->assertTrue(false, 'testGetFieldOptions Failed : '.$e->getMessage());
         }
@@ -69,6 +103,9 @@ public function testCreateFields()
             $fieldService = new FieldService();
 
             $ret = $fieldService->create($field);
+
+            $this->assertTrue(true);
+
             Dumper::dump($ret);
         } catch (JiraException $e) {
             $this->assertTrue(false, 'Field Create Failed : '.$e->getMessage());
diff --git a/tests/MapperTest.php b/tests/MapperTest.php
index a74b5e43..49d02452 100644
--- a/tests/MapperTest.php
+++ b/tests/MapperTest.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace JiraRestApi\Test;
 
@@ -89,4 +89,17 @@ public function testIssue()
 
     }
 
+    public function testReporterField()
+    {
+        $ret = file_get_contents('test-data/reporter-no-email-address.json');
+
+        $reporter = $this->mapper->map(
+            json_decode($ret), new Reporter()
+        );
+
+        $this->assertInstanceOf(Reporter::class, $reporter);
+
+        $this->assertEquals('lesstif@gmail.com', $reporter->emailAddress);
+    }
+
 }
diff --git a/tests/SPrintTest.php b/tests/SPrintTest.php
index c05b9c8e..3b3c930d 100644
--- a/tests/SPrintTest.php
+++ b/tests/SPrintTest.php
@@ -71,9 +71,9 @@ public function get_sprints(int $sprintId) : int
      * @depends get_sprints
      *
      * @param int $sprintId
-     * @return void
+     * @return int
      */
-    public function get_issues_in_sprints(int $sprintId)
+    public function get_issues_in_sprints(int $sprintId) : int
     {
         try {
             $sps = new SprintService();
@@ -82,8 +82,40 @@ public function get_issues_in_sprints(int $sprintId)
 
             $this->assertNotNull($sprint);
             Dumper::dump($sprint);
+
+            return $sprintId;
         } catch (Exception $e) {
             $this->fail('testSearch Failed : '.$e->getMessage());
         }
     }
+
+    /**
+     * @test
+     * @depends get_issues_in_sprints
+     *
+     * @param int $sprintId
+     * @return int
+     */
+    public function move_issues_to_sprints(int $sprintId) : int
+    {
+        try {
+            $sp = (new Sprint())
+                ->setMoveIssues([
+                    "MOBL-1",
+                    "MOBL-5",
+                ])
+
+            ;
+
+            $sps = new SprintService();
+
+            $sprint = $sps->moveIssues2Sprint($sprintId, $sp);
+
+            $this->assertNotNull($sprint);
+
+            return $sprintId;
+        } catch (Exception $e) {
+            $this->fail('move_issues_to_sprints Failed : '.$e->getMessage());
+        }
+    }
 }
\ No newline at end of file
diff --git a/tests/ServiceDesk/Request/RequestServiceTest.php b/tests/ServiceDesk/Request/RequestServiceTest.php
index 2c587ac5..76e831d0 100644
--- a/tests/ServiceDesk/Request/RequestServiceTest.php
+++ b/tests/ServiceDesk/Request/RequestServiceTest.php
@@ -369,6 +369,33 @@ public function testGetWorklogById(): void
         self::assertSame($item->timeSpent, $result->timeSpent);
     }
 
+	public function testGetWorklogsByIds(): void
+	{
+		$item1 = new stdClass();
+		$item1->id = 25;
+		$item1->timeSpent = '2 hours';
+
+		$item2 = new stdClass();
+		$item2->id = 50;
+		$item2->timeSpent = '2 hours';
+
+
+		$items = [
+			$item1,
+			$item2,
+		];
+
+		$this->client->method('exec')
+			->with("/worklog/list", json_encode(['ids' => [25, 50]]), 'POST')
+			->willReturn(json_encode($items));
+
+		$result = $this->uut->getWorklogsByIds([25, 50]);
+
+		self::assertSame(2, count($result));
+		self::assertSame($item1->timeSpent, $result[0]->timeSpent);
+
+	}
+
     public function testAddWorklog(): void
     {
         $item = $this->createWorkflow(25, '2 hours');
diff --git a/tests/WorkLogTest.php b/tests/WorkLogTest.php
index a393e44a..2da791ea 100644
--- a/tests/WorkLogTest.php
+++ b/tests/WorkLogTest.php
@@ -95,6 +95,22 @@ public function testGetWorkLogById($workLogid)
         }
     }
 
+	/**
+	 * @depends testUpdateWorkLogInIssue
+	 */
+	public function testGetWorkLogsByIds($workLogid)
+	{
+		try {
+			$issueService = new IssueService();
+
+			$worklogs = $issueService->getWorklogsByIds([$workLogid]);
+
+			Dumper::dump($worklogs);
+		} catch (JiraException $e) {
+			$this->assertTrue(false, 'testGetWorkLogsByIds Failed : '.$e->getMessage());
+		}
+	}
+
     /**
      * @depends testUpdateWorkLogInIssue
      */