diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d08273..dfa0bf0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -62,3 +62,8 @@
   - Tags are now added, therefore it can be replaced by ingest method.
   - overwriteExisting flag has been fixed and works as expected now!
 - Introduce `includeInternalPublication` in Events API `getAll`, `get` and `getPublications` methods [#37]
+- Deprecated methods cleanup! [#39]
+  - `OcWorkflow->getStatistics()`
+  - `OcWorkflow->getInstances()`
+  - `OcSeries->getTitles()`
+  - `OcSeries->getAll()`
diff --git a/src/OpencastApi/Rest/OcSeries.php b/src/OpencastApi/Rest/OcSeries.php
index 0cb08d2..43274b0 100644
--- a/src/OpencastApi/Rest/OcSeries.php
+++ b/src/OpencastApi/Rest/OcSeries.php
@@ -25,7 +25,7 @@ public function getCount()
     /**
      * Returns the access control list for the series with the given identifier as JSON (Object) by default or XLM (text).
      *
-     * @param string $seriesId The series identifier 
+     * @param string $seriesId The series identifier
      * @param string $format (optional) The output format (json or xml) of the response body. (Default value = 'json')
      *
      * @return array the response result ['code' => 200, 'body' => '{The access control list as JSON (Object) or XML (text)}']
@@ -40,17 +40,6 @@ public function getAcl($seriesId, $format = '')
         return $this->restClient->performGet($uri);
     }
 
-    /**
-     * Returns a list of identifier and title of all series
-     * @return array the response result ['code' => 200, 'body' => '{JSON (object) list of identifier and title of all series}']
-     * @deprecated since version v1.3, removed from Opencast Version 12
-     */
-    public function getTitles()
-    {
-        $uri = self::URI . "/allSeriesIdTitle.json";
-        return $this->restClient->performGet($uri);
-    }
-
     /**
      * Returns the series with the given identifier as JSON (Object) by default or XLM (text).
      *
@@ -68,7 +57,7 @@ public function get($seriesId, $format = '')
 
         return $this->restClient->performGet($uri);
     }
-    
+
     /**
      * Returns the series element
      *
@@ -113,7 +102,7 @@ public function getProperties($seriesId)
      * Returns a series property value
      *
      * @param string $seriesId The series identifier
-     * @param string $propertyName Name of series property 
+     * @param string $propertyName Name of series property
      *
      * @return array the response result ['code' => 200, 'body' => '{JSON (object) series property value}']
      */
@@ -123,83 +112,6 @@ public function getProperty($seriesId, $propertyName)
         return $this->restClient->performGet($uri);
     }
 
-    /**
-     * Returns the series matching the query parameters as JSON (array) by default or XLM (text).
-     *
-     * @param array $params (optional) The list of query params to pass which can contain the followings:
-     * [
-     *      'q' => '{Free text search}',
-     *      'edit' => '(boolean){Whether this query should return only series that are editable}',
-     *      'fuzzyMatch' => '(boolean){Whether the seriesId can be used for a partial match. The default is an exact match}',
-     *      'seriesId' => '{The series identifier}',
-     *      'seriesTitle' => '{The series title}',
-     *      'creator' => '{The series creator}',
-     *      'contributor' => '{The series contributor}',
-     *      'publisher' => '{The series publisher}',
-     *      'rightsholder' => '{The series rights holder}',
-     *      'createdfrom' => '{Filter results by created from (yyyy-MM-dd'T'HH:mm:ss'Z') }',
-     *      'createdto' => '{Filter results by created to (yyyy-MM-dd'T'HH:mm:ss'Z')) }',
-     *      'language' => '{The series language}',
-     *      'license' => '{The series license}',
-     *      'subject' => '{The series subject}',
-     *      'abstract' => '{The series abstract}',
-     *      'description' => '{The series description}',
-     *      'sort' => '{The sort order. May include any of the following: TITLE, SUBJECT, CREATOR, PUBLISHER, CONTRIBUTOR, ABSTRACT, DESCRIPTION, CREATED, AVAILABLE_FROM, AVAILABLE_TO, LANGUAGE, RIGHTS_HOLDER, SPATIAL, TEMPORAL, IS_PART_OF, REPLACES, TYPE, ACCESS, LICENCE. Add '_DESC' to reverse the sort order (e.g. TITLE_DESC)}',
-     *      'startPage' => '{The page offset}',
-     *      'count' => '{Results per page (max 100)}',
-     * ]
-     * @param string $format (optional) The output format (json or xml) of the response body. (Default value = 'json')
-     *
-     * @return array the response result ['code' => 200, 'body' => '{the series search results as JSON (array) or XML (text)}']
-     * @deprecated Deprecated since version 1.3 - since it is removed from Opencast Verrsion 12.
-     */
-    public function getAll($params = [], $format = '')
-    {
-        $uri = self::URI . "/series.json";
-        if (!empty($format) && strtolower($format) == 'xml') {
-            $uri = str_replace('.json', '.xml', $uri);
-        }
-
-        $query = [];
-        $acceptableParams = [
-            'q', 'edit', 'fuzzyMatch', 'seriesId', 'seriesTitle',
-            'creator', 'contributor', 'publisher', 'rightsholder', 'createdfrom',
-            'createdto', 'language', 'license', 'subject', 'abstract',
-            'description', 'startPage', 'count'
-        ];
-        foreach ($params as $param_name => $param_value) {
-            if (in_array($param_name, $acceptableParams)) {
-                if ((($param_name == 'edit' || $param_name == 'fuzzyMatch') && is_bool($param_value)) || !empty($param_value)) {
-                    if ($param_name == 'count') {
-                        $param_value = intval($param_value);
-                        $param_value = ($param_value <= 100) ?: 100;
-                    }
-                    $query[$param_name] = $param_value;
-                }
-            }
-        }
-        $sortsASC = [
-            'TITLE', 'SUBJECT', 'CREATOR', 'PUBLISHER',
-            'CONTRIBUTOR', 'ABSTRACT', 'DESCRIPTION', 'CREATED',
-            'AVAILABLE_FROM', 'AVAILABLE_TO','LANGUAGE', 'RIGHTS_HOLDER',
-            'SPATIAL', 'TEMPORAL', 'IS_PART_OF', 'REPLACES', 'TYPE',
-            'ACCESS', 'LICENCE'
-        ];
-        $sortsDESC = array_map(function ($sort) {
-            return "{$sort}_DESC";
-        }, $sortsASC);
-
-        $sorts = array_merge($sortsASC, $sortsDESC);
-        
-        if (array_key_exists('sort', $params) && !empty($params['sort']) &&
-            in_array($params['sort'], $sorts)) {
-            $query['sort'] = $params['sort'];
-        }
-
-        $options = $this->restClient->getQueryParams($query);
-        return $this->restClient->performGet($uri, $options);
-    }
-
     /**
      * Deletes a series
      *
@@ -215,9 +127,9 @@ public function delete($seriesId)
 
     /**
      * Deletes a series element
-     * 
+     *
      * @param string $seriesId The series identifier
-     * @param string $elementType The element type 
+     * @param string $elementType The element type
      *
      * @return array the response result ['code' => 204, 'reason' => 'No Content'] (Series element deleted)
      */
@@ -229,7 +141,7 @@ public function deleteElement($seriesId, $elementType)
 
     /**
      * Deletes a series property
-     * 
+     *
      * @param string $seriesId The series identifier
      * @param string $propertyName Name of series property
      *
@@ -307,8 +219,8 @@ public function updateAcl($seriesId, $acl, $override = false)
      *
      * @return array the response result:
      * ['code' => 201, 'reason' => 'Created'] (series created)
-     * ['code' => 204, 'reason' => 'No Content'] (series updated) 
-     * 
+     * ['code' => 204, 'reason' => 'No Content'] (series updated)
+     *
      */
     public function update($params, $override = false)
     {
@@ -374,4 +286,4 @@ public function updateProperty($seriesId, $name, $value)
         return $this->restClient->performPost($uri, $options);
     }
 }
-?>
\ No newline at end of file
+?>
diff --git a/src/OpencastApi/Rest/OcWorkflow.php b/src/OpencastApi/Rest/OcWorkflow.php
index 3ed17fa..c3fb313 100644
--- a/src/OpencastApi/Rest/OcWorkflow.php
+++ b/src/OpencastApi/Rest/OcWorkflow.php
@@ -14,7 +14,7 @@ public function __construct($restClient)
     /**
      * Get the configuration panel for a specific workflow
      *
-     * @param string $definitionId (optional) The workflow definition identifier 
+     * @param string $definitionId (optional) The workflow definition identifier
      *
      * @return array the response result ['code' => 200, 'body' => '{The HTML workflow configuration panel}']
      */
@@ -26,7 +26,7 @@ public function getConfigurationPanel($definitionId = '')
         if (!empty($definitionId)) {
             $query['definitionId'] = $definitionId;
         }
-        
+
         $options = $this->restClient->getQueryParams($query);
         return $this->restClient->performGet($uri, $options);
     }
@@ -34,7 +34,7 @@ public function getConfigurationPanel($definitionId = '')
     /**
      * Returns the number of workflow instances in a specific state and operation
      *
-     * @param string $state (optional) The workflow state  
+     * @param string $state (optional) The workflow state
      * @param string $operation (optional) The current operation
      *
      * @return array the response result ['code' => 200, 'body' => '{The number of workflow instances}']
@@ -50,7 +50,7 @@ public function getCount($state = '', $operation = '')
         if (!empty($operation)) {
             $query['operation'] = $operation;
         }
-        
+
         $options = $this->restClient->getQueryParams($query);
         return $this->restClient->performGet($uri, $options);
     }
@@ -112,26 +112,9 @@ public function getStateMappings()
         return $this->restClient->performGet($uri);
     }
 
-    /**
-     * Returns the workflow statistics as JSON (Object) by default or XLM (text)
-     * 
-     * @param string $format (optional) The output format (json or xml) of the response body. (Default value = 'json')
-     *
-     * @return array the response result ['code' => 200, 'body' => '{A JSON (object) | XML (text) representation of the workflow statistics }']
-     * @deprecated from version v1.3 and will be removed in v1.4
-     */
-    public function getStatistics($format = '')
-    {
-        $uri = self::URI . "/statistics.json";
-        if (!empty($format) && strtolower($format) == 'xml') {
-            $uri = str_replace('.json', '.xml', $uri);
-        }
-        return $this->restClient->performGet($uri);
-    }
-
     /**
      * Get a specific workflow instance as JSON (Object) by default or XLM (text).
-     * 
+     *
      * @param string $instanceId The workflow instance identifier
      * @param string $format (optional) The output format (json or xml) of the response body. (Default value = 'json')
      *
@@ -146,82 +129,11 @@ public function getInstance($instanceId, $format = '')
         return $this->restClient->performGet($uri);
     }
 
-    /**
-     * List all workflow instances matching the query parameters as JSON (Object) by default or XLM (text).
-     *
-     * @param array $params (optional) The list of query params to pass which can contain the followings:
-     * [
-     *      'state' => '{Filter results by workflows' current state}',
-     *      'q' => '{Filter results by free text query}',
-     *      'seriesId' => '{ Filter results by series identifier }',
-     *      'seriesTitle' => '{ Filter results by series title }',
-     *      'creator' => '{ Filter results by the mediapackage's creator }',
-     *      'contributor' => '{Filter results by the mediapackage's contributor}',
-     *      'fromdate' => '{Filter results by workflow start date}',
-     *      'todate' => '{Filter results by workflow start date}',
-     *      'language' => '{Filter results by mediapackage's language.}',
-     *      'license' => '{Filter results by mediapackage's license}',
-     *      'title' => '{Filter results by mediapackage's title}',
-     *      'subject' => '{Filter results by mediapackage's subject}',
-     *      'workflowdefinition' => '{Filter results by workflow definition}',
-     *      'mp' => '{Filter results by mediapackage identifier.}',
-     *      'op' => '{ Filter results by workflows' current operation}',
-     *      'sort' => '{The sort order. May include any of the following: DATE_CREATED, TITLE, SERIES_TITLE, SERIES_ID, MEDIA_PACKAGE_ID, WORKFLOW_DEFINITION_ID, CREATOR, CONTRIBUTOR, LANGUAGE, LICENSE, SUBJECT. Add '_DESC' to reverse the sort order (e.g. TITLE_DESC)}',
-     *      'startPage' => '{(Default value=0): The paging offset }',
-     *      'count' => '{(Default value=0): The number of results to return.}',
-     *      'compact' => '{Whether to return a compact version of the workflow instance, with mediapackage elements, workflow and workflow operation configurations and non-current operations removed}',
-     * ]
-     * @param string $format (optional) The output format (json or xml) of the response body. (Default value = 'json')
-     *
-     * @return array the response result ['code' => 200, 'body' => '{A JSON (object) | XML (text) representation of the workflow set }']
-     * @deprecated from version v1.3 and will be removed in v1.4
-     */
-    public function getInstances($params = [], $format = '')
-    {
-        $uri = self::URI . "/instances.json";
-        if (!empty($format) && strtolower($format) == 'xml') {
-            $uri = str_replace('.json', '.xml', $uri);
-        }
-
-        $query = [];
-
-        $sortsASC = [
-            'DATE_CREATED', 'TITLE', 'SERIES_TITLE', 'SERIES_ID',
-            'MEDIA_PACKAGE_ID', 'WORKFLOW_DEFINITION_ID', 'CREATOR', 'CONTRIBUTOR',
-            'LANGUAGE', 'LICENSE','SUBJECT'
-        ];
-        $sortsDESC = array_map(function ($sort) {
-            return "{$sort}_DESC";
-        }, $sortsASC);
-        
-        $sorts = array_merge($sortsASC, $sortsDESC);
-        
-        if (array_key_exists('sort', $params) && !empty($params['sort']) &&
-            in_array($params['sort'], $sorts)) {
-            $query['sort'] = $params['sort'];
-        }
-
-        $acceptableParams = [
-            'state', 'q', 'seriesId', 'seriesTitle', 'creator', 'contributor',
-            'fromdate', 'todate', 'language', 'license', 'title', 'subject',
-            'workflowdefinition', 'mp', 'op', 'startPage', 'count', 'compact'
-        ];
-
-        foreach ($params as $param_name => $param_value) {
-            if (in_array($param_name, $acceptableParams) && !array_key_exists($param_name, $query)) {
-                $query[$param_name] = $param_value;
-            }
-        }
-        
-        $options = $this->restClient->getQueryParams($query);
-        return $this->restClient->performGet($uri, $options);
-    }
-
     /**
      * (Danger!) Permenantly removes a workflow instance including all its child jobs.
      * In most circumstances, /stop is what you should use.
      *
-     * @param string $instanceId The workflow instance identifier 
+     * @param string $instanceId The workflow instance identifier
      * @param boolean $force (optional) If the workflow status should be ignored and the workflow removed anyway (Default value=false)
      *
      * @return array the response result ['code' => 204, 'reason' => 'No Content'] (If workflow instance could be removed successfully, no content is returned)
@@ -246,7 +158,7 @@ public function removeInstance($instanceId, $force = false)
      * @param array|string $mediapackage (Optional) The new Mediapackage
      * @param array|string $properties (Optional) Properties
      *
-     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the updated and resumed workflow instance}'] 
+     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the updated and resumed workflow instance}']
      */
     public function replaceAndresume($instanceId, $mediapackage = '', $properties = '')
     {
@@ -271,7 +183,7 @@ public function replaceAndresume($instanceId, $mediapackage = '', $properties =
      *
      * @param string $instanceId The workflow instance identifier
      *
-     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the resumed workflow instance.}'] 
+     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the resumed workflow instance.}']
      */
     public function resume($instanceId)
     {
@@ -293,7 +205,7 @@ public function resume($instanceId)
      * @param string $parent (Optional) An optional parent workflow instance identifier
      * @param string|array $properties (Optional) An optional set of key=value properties
      *
-     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the new workflow instance.}'] 
+     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the new workflow instance.}']
      */
     public function start($definition, $mediapackage, $parent = '', $properties = '')
     {
@@ -319,7 +231,7 @@ public function start($definition, $mediapackage, $parent = '', $properties = ''
      *
      * @param string $instanceId The workflow instance identifier
      *
-     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the stopped workflow instance.}'] 
+     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the stopped workflow instance.}']
      */
     public function stop($instanceId)
     {
@@ -338,7 +250,7 @@ public function stop($instanceId)
      *
      * @param string $identifier The workflow instance identifier
      *
-     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the suspended workflow instance.}'] 
+     * @return array the response result ['code' => 200, 'body' => '{An XML (as text) representation of the suspended workflow instance.}']
      */
     public function suspend($instanceId)
     {
@@ -371,4 +283,4 @@ public function update($workflow)
         return $this->restClient->performPost($uri, $options);
     }
 }
-?>
\ No newline at end of file
+?>
diff --git a/tests/Unit/OcWorkflowTest.php b/tests/Unit/OcWorkflowTest.php
index 796002e..a355a5f 100644
--- a/tests/Unit/OcWorkflowTest.php
+++ b/tests/Unit/OcWorkflowTest.php
@@ -50,16 +50,6 @@ public function getters_test(): void
         $responseGetStateMappings = $this->ocWorkflow->getStateMappings();
         $this->assertSame(200, $responseGetStateMappings['code'], 'Failure to get State Mappings');
 
-        // Get statistics @depricated
-        // $responseGetStatistics = $this->ocWorkflow->getStatistics();
-        // $this->assertSame(200, $responseGetStatistics['code'], 'Failure to get statistics');
-
-        // Get All Instances  @depricated
-        // $responseGetInstances = $this->ocWorkflow->getInstances();
-        // $this->assertSame(200, $responseGetInstances['code'], 'Failure to get workflow Instances');
-        // $instances = $responseGetInstances['body']->workflows->workflow;
-        // $this->assertNotEmpty($instances);
-
         // Get Single Instance
         $dummyInstanceId = 1234567890;
         $responseGetInstance = $this->ocWorkflow->getInstance($dummyInstanceId);