diff --git a/src/Attachment/AttachmentService.php b/src/Attachment/AttachmentService.php
index a8a97ede..9e12664e 100644
--- a/src/Attachment/AttachmentService.php
+++ b/src/Attachment/AttachmentService.php
@@ -29,7 +29,7 @@ public function get($id, $outDir = null, $overwrite = false, $mode = 0777, $recu
     {
         $ret = $this->exec($this->uri.$id, null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         $attachment = $this->json_mapper->map(
                 json_decode($ret), new Attachment()
@@ -69,7 +69,7 @@ public function remove($id)
     {
         $ret = $this->exec($this->uri.$id, null, 'DELETE');
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         return $ret;
     }
diff --git a/src/Field/FieldService.php b/src/Field/FieldService.php
index e8bcd227..719c88a3 100644
--- a/src/Field/FieldService.php
+++ b/src/Field/FieldService.php
@@ -61,7 +61,7 @@ public function getCustomFieldOption($id)
     {
         $ret = $this->exec('/customFieldOption/'.$id);
 
-        $this->log->addDebug("get custom Field Option=\n".$ret);
+        $this->log->debug("get custom Field Option=\n".$ret);
 
         return $ret;
     }
@@ -80,7 +80,7 @@ public function create(Field $field)
     {
         $data = json_encode($field);
 
-        $this->log->addInfo("Create Field=\n".$data);
+        $this->log->info("Create Field=\n".$data);
 
         $ret = $this->exec($this->uri, $data, 'POST');
 
diff --git a/src/Group/GroupService.php b/src/Group/GroupService.php
index 63f3d227..0868fa95 100644
--- a/src/Group/GroupService.php
+++ b/src/Group/GroupService.php
@@ -26,7 +26,7 @@ public function get($paramArray)
 
         $ret = $this->exec($this->uri.$queryParam, null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         return $this->json_mapper->map(
                 json_decode($ret), new Group()
@@ -49,7 +49,7 @@ public function getMembers($paramArray)
 
         $ret = $this->exec($this->uri.'/member'.$queryParam, null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         $userData = json_decode($ret);
 
@@ -74,7 +74,7 @@ public function createGroup($group)
 
         $ret = $this->exec($this->uri, $data);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         $group = $this->json_mapper->map(
             json_decode($ret), new Group()
@@ -100,7 +100,7 @@ public function addUserToGroup($groupName, $userName)
 
         $ret = $this->exec($this->uri.'/user?groupname='.urlencode($groupName), $data);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         $group = $this->json_mapper->map(
             json_decode($ret), new Group()
@@ -125,7 +125,7 @@ public function removeUserFromGroup($groupName, $userName)
 
         $ret = $this->exec($this->uri.'/user?'.$param, [], 'DELETE');
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         return $ret;
     }
diff --git a/src/Issue/IssueService.php b/src/Issue/IssueService.php
index 686fb58e..7367691e 100644
--- a/src/Issue/IssueService.php
+++ b/src/Issue/IssueService.php
@@ -42,7 +42,7 @@ public function get($issueIdOrKey, $paramArray = [], $issueObject = null)
 
         $ret = $this->exec($this->uri.'/'.$issueIdOrKey.$this->toHttpQueryParameter($paramArray), null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         return $issue = $this->json_mapper->map(
             json_decode($ret), $issueObject
@@ -68,7 +68,7 @@ public function create($issueField)
 
         $data = json_encode($issue);
 
-        $this->log->addInfo("Create Issue=\n".$data);
+        $this->log->info("Create Issue=\n".$data);
 
         $ret = $this->exec($this->uri, $data, 'POST');
 
@@ -120,7 +120,7 @@ private function bulkInsert($issues)
     {
         $data = json_encode(['issueUpdates' => $issues]);
 
-        $this->log->addInfo("Create Issues=\n".$data);
+        $this->log->info("Create Issues=\n".$data);
         $results = $this->exec($this->uri.'/bulk', $data, 'POST');
 
         $issues = [];
@@ -150,7 +150,7 @@ public function addAttachments($issueIdOrKey, $filePathArray)
 
         $results = $this->upload($this->uri."/$issueIdOrKey/attachments", $filePathArray);
 
-        $this->log->addInfo('addAttachments result='.var_export($results, true));
+        $this->log->info('addAttachments result='.var_export($results, true));
 
         $attachArr = [];
         foreach ($results as $ret) {
@@ -196,7 +196,7 @@ public function update($issueIdOrKey, $issueField, $paramArray = [])
 
         $data = json_encode($issue);
 
-        $this->log->addInfo("Update Issue=\n".$data);
+        $this->log->info("Update Issue=\n".$data);
 
         $queryParam = '?'.http_build_query($paramArray);
 
@@ -218,13 +218,13 @@ public function update($issueIdOrKey, $issueField, $paramArray = [])
      */
     public function addComment($issueIdOrKey, $comment)
     {
-        $this->log->addInfo("addComment=\n");
+        $this->log->info("addComment=\n");
 
         $data = json_encode($comment);
 
         $ret = $this->exec($this->uri."/$issueIdOrKey/comment", $data);
 
-        $this->log->addDebug('add comment result='.var_export($ret, true));
+        $this->log->debug('add comment result='.var_export($ret, true));
         $comment = $this->json_mapper->map(
            json_decode($ret), new Comment()
         );
@@ -246,13 +246,13 @@ public function addComment($issueIdOrKey, $comment)
      */
     public function updateComment($issueIdOrKey, $id, $comment)
     {
-        $this->log->addInfo("updateComment=\n");
+        $this->log->info("updateComment=\n");
 
         $data = json_encode($comment);
 
         $ret = $this->exec($this->uri."/$issueIdOrKey/comment/$id", $data, 'PUT');
 
-        $this->log->addDebug('update comment result='.var_export($ret, true));
+        $this->log->debug('update comment result='.var_export($ret, true));
         $comment = $this->json_mapper->map(
             json_decode($ret), new Comment()
         );
@@ -273,11 +273,11 @@ public function updateComment($issueIdOrKey, $id, $comment)
      */
     public function getComment($issueIdOrKey, $id)
     {
-        $this->log->addInfo("getComment=\n");
+        $this->log->info("getComment=\n");
 
         $ret = $this->exec($this->uri."/$issueIdOrKey/comment/$id");
 
-        $this->log->addDebug('get comment result='.var_export($ret, true));
+        $this->log->debug('get comment result='.var_export($ret, true));
         $comment = $this->json_mapper->map(
                 json_decode($ret), new Comment()
                 );
@@ -297,11 +297,11 @@ public function getComment($issueIdOrKey, $id)
      */
     public function getComments($issueIdOrKey)
     {
-        $this->log->addInfo("getComments=\n");
+        $this->log->info("getComments=\n");
 
         $ret = $this->exec($this->uri."/$issueIdOrKey/comment");
 
-        $this->log->addDebug('get comments result='.var_export($ret, true));
+        $this->log->debug('get comments result='.var_export($ret, true));
         $comment = $this->json_mapper->map(
                 json_decode($ret), new Comment()
                 );
@@ -321,11 +321,11 @@ public function getComments($issueIdOrKey)
      */
     public function deleteComment($issueIdOrKey, $id)
     {
-        $this->log->addInfo("deleteComment=\n");
+        $this->log->info("deleteComment=\n");
 
         $ret = $this->exec($this->uri."/$issueIdOrKey/comment/$id", '', 'DELETE');
 
-        $this->log->addInfo('delete comment '.$issueIdOrKey.' '.$id.' result='.var_export($ret, true));
+        $this->log->info('delete comment '.$issueIdOrKey.' '.$id.' result='.var_export($ret, true));
 
         return $ret;
     }
@@ -344,7 +344,7 @@ public function deleteComment($issueIdOrKey, $id)
      */
     public function changeAssignee($issueIdOrKey, $assigneeName)
     {
-        $this->log->addInfo("changeAssignee=\n");
+        $this->log->info("changeAssignee=\n");
 
         $ar = ['name' => $assigneeName];
 
@@ -352,7 +352,7 @@ public function changeAssignee($issueIdOrKey, $assigneeName)
 
         $ret = $this->exec($this->uri."/$issueIdOrKey/assignee", $data, 'PUT');
 
-        $this->log->addInfo('change assignee of '.$issueIdOrKey.' to '.$assigneeName.' result='.var_export($ret, true));
+        $this->log->info('change assignee of '.$issueIdOrKey.' to '.$assigneeName.' result='.var_export($ret, true));
 
         return $ret;
     }
@@ -369,13 +369,13 @@ public function changeAssignee($issueIdOrKey, $assigneeName)
      */
     public function deleteIssue($issueIdOrKey, $paramArray = [])
     {
-        $this->log->addInfo("deleteIssue=\n");
+        $this->log->info("deleteIssue=\n");
 
         $queryParam = '?'.http_build_query($paramArray);
 
         $ret = $this->exec($this->uri."/$issueIdOrKey".$queryParam, '', 'DELETE');
 
-        $this->log->addInfo('delete issue '.$issueIdOrKey.' result='.var_export($ret, true));
+        $this->log->info('delete issue '.$issueIdOrKey.' result='.var_export($ret, true));
 
         return $ret;
     }
@@ -393,7 +393,7 @@ public function getTransition($issueIdOrKey)
     {
         $ret = $this->exec($this->uri."/$issueIdOrKey/transitions");
 
-        $this->log->addDebug('getTransitions result='.var_export($ret, true));
+        $this->log->debug('getTransitions result='.var_export($ret, true));
 
         $data = json_encode(json_decode($ret)->transitions);
 
@@ -416,14 +416,14 @@ public function getTransition($issueIdOrKey)
      */
     public function findTransitonId($issueIdOrKey, $transitionToName)
     {
-        $this->log->addDebug('findTransitonId=');
+        $this->log->debug('findTransitonId=');
 
         $ret = $this->getTransition($issueIdOrKey);
 
         foreach ($ret as $trans) {
             $toName = $trans->to->name;
 
-            $this->log->addDebug('getTransitions result='.var_export($ret, true));
+            $this->log->debug('getTransitions result='.var_export($ret, true));
 
             if (strcmp($toName, $transitionToName) == 0) {
                 return $trans->id;
@@ -446,7 +446,7 @@ public function findTransitonId($issueIdOrKey, $transitionToName)
      */
     public function transition($issueIdOrKey, $transition)
     {
-        $this->log->addDebug('transition='.var_export($transition, true));
+        $this->log->debug('transition='.var_export($transition, true));
 
         if (!isset($transition->transition['id'])) {
             $transition->transition['id'] = $this->findTransitonId($issueIdOrKey, $transition->transition['name']);
@@ -454,11 +454,11 @@ public function transition($issueIdOrKey, $transition)
 
         $data = json_encode($transition);
 
-        $this->log->addDebug("transition req=$data\n");
+        $this->log->debug("transition req=$data\n");
 
         $ret = $this->exec($this->uri."/$issueIdOrKey/transitions", $data, 'POST');
 
-        $this->log->addDebug('getTransitions result='.var_export($ret, true));
+        $this->log->debug('getTransitions result='.var_export($ret, true));
 
         return $ret;
     }
@@ -512,7 +512,7 @@ public function search($jql, $startAt = 0, $maxResults = 15, $fields = [], $expa
     public function getTimeTracking($issueIdOrKey)
     {
         $ret = $this->exec($this->uri."/$issueIdOrKey", null);
-        $this->log->addDebug("getTimeTracking res=$ret\n");
+        $this->log->debug("getTimeTracking res=$ret\n");
 
         $issue = $this->json_mapper->map(
              json_decode($ret), new Issue()
@@ -543,7 +543,7 @@ public function timeTracking($issueIdOrKey, $timeTracking)
 
         $data = json_encode($array);
 
-        $this->log->addDebug("TimeTracking req=$data\n");
+        $this->log->debug("TimeTracking req=$data\n");
 
         // if success, just return HTTP 201.
         $ret = $this->exec($this->uri."/$issueIdOrKey", $data, 'PUT');
@@ -564,7 +564,7 @@ public function timeTracking($issueIdOrKey, $timeTracking)
     public function getWorklog($issueIdOrKey)
     {
         $ret = $this->exec($this->uri."/$issueIdOrKey/worklog");
-        $this->log->addDebug("getWorklog res=$ret\n");
+        $this->log->debug("getWorklog res=$ret\n");
         $worklog = $this->json_mapper->map(
             json_decode($ret), new PaginatedWorklog()
         );
@@ -586,7 +586,7 @@ public function getWorklog($issueIdOrKey)
     public function getWorklogById($issueIdOrKey, $workLogId)
     {
         $ret = $this->exec($this->uri."/$issueIdOrKey/worklog/$workLogId");
-        $this->log->addDebug("getWorklogById res=$ret\n");
+        $this->log->debug("getWorklogById res=$ret\n");
         $worklog = $this->json_mapper->map(
             json_decode($ret), new Worklog()
         );
@@ -607,7 +607,7 @@ public function getWorklogById($issueIdOrKey, $workLogId)
      */
     public function addWorklog($issueIdOrKey, $worklog)
     {
-        $this->log->addInfo("addWorklog=\n");
+        $this->log->info("addWorklog=\n");
 
         $data = json_encode($worklog);
         $url = $this->uri."/$issueIdOrKey/worklog";
@@ -636,7 +636,7 @@ public function addWorklog($issueIdOrKey, $worklog)
      */
     public function editWorklog($issueIdOrKey, $worklog, $worklogId)
     {
-        $this->log->addInfo("editWorklog=\n");
+        $this->log->info("editWorklog=\n");
 
         $data = json_encode($worklog);
         $url = $this->uri."/$issueIdOrKey/worklog/$worklogId";
@@ -684,7 +684,7 @@ public function getPriority($priorityId)
     {
         $ret = $this->exec("priority/$priorityId", null);
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $prio = $this->json_mapper->map(
              json_decode($ret), new Priority()
@@ -708,7 +708,7 @@ public function getCustomFields($priorityId)
     {
         $ret = $this->exec("priority/$priorityId", null);
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $prio = $this->json_mapper->map(
             json_decode($ret), new Priority()
@@ -728,7 +728,7 @@ public function getCustomFields($priorityId)
      */
     public function getWatchers($issueIdOrKey)
     {
-        $this->log->addInfo("getWatchers=\n");
+        $this->log->info("getWatchers=\n");
 
         $url = $this->uri."/$issueIdOrKey/watchers";
 
@@ -753,7 +753,7 @@ public function getWatchers($issueIdOrKey)
      */
     public function addWatcher($issueIdOrKey, $watcher)
     {
-        $this->log->addInfo("addWatcher=\n");
+        $this->log->info("addWatcher=\n");
 
         $data = json_encode($watcher);
         $url = $this->uri."/$issueIdOrKey/watchers";
@@ -847,7 +847,7 @@ public function notify($issueIdOrKey, $notify)
 
         $data = json_encode($notify, JSON_UNESCAPED_SLASHES);
 
-        $this->log->addDebug("notify=$data\n");
+        $this->log->debug("notify=$data\n");
 
         $ret = $this->exec($full_uri, $data, 'POST');
 
@@ -896,7 +896,7 @@ public function createOrUpdateRemoteIssueLink($issueIdOrKey, RemoteIssueLink $ri
 
         $data = json_encode($ril, JSON_UNESCAPED_SLASHES);
 
-        $this->log->addDebug("create remoteIssueLink=$data\n");
+        $this->log->debug("create remoteIssueLink=$data\n");
 
         $ret = $this->exec($full_uri, $data, 'POST');
 
@@ -923,7 +923,7 @@ public function removeRemoteIssueLink($issueIdOrKey, $globalId)
 
         $ret = $this->exec($full_uri, '', 'DELETE');
 
-        $this->log->addInfo(
+        $this->log->info(
             sprintf(
                 'delete remote issue link for issue "%s" with globalId "%s". Result=%s',
                 $issueIdOrKey,
@@ -1013,7 +1013,7 @@ public function updateLabels($issueIdOrKey, $addLablesParam, $removeLabelsParam,
             ],
         ], JSON_UNESCAPED_UNICODE);
 
-        $this->log->addInfo("Update labels=\n".$postData);
+        $this->log->info("Update labels=\n".$postData);
 
         $queryParam = '?'.http_build_query(['notifyUsers' => $notifyUsers]);
 
@@ -1051,7 +1051,7 @@ public function updateFixVersions($issueIdOrKey, $addFixVersionsParam, $removeFi
             ],
         ], JSON_UNESCAPED_UNICODE);
 
-        $this->log->addInfo("Update fixVersions=\n".$postData);
+        $this->log->info("Update fixVersions=\n".$postData);
 
         $queryParam = '?'.http_build_query(['notifyUsers' => $notifyUsers]);
 
diff --git a/src/IssueLink/IssueLinkService.php b/src/IssueLink/IssueLinkService.php
index 9b1092c6..b8322cb7 100644
--- a/src/IssueLink/IssueLinkService.php
+++ b/src/IssueLink/IssueLinkService.php
@@ -13,11 +13,11 @@ class IssueLinkService extends \JiraRestApi\JiraClient
      */
     public function addIssueLink($issueLink)
     {
-        $this->log->addInfo("addIssueLink=\n");
+        $this->log->info("addIssueLink=\n");
 
         $data = json_encode($issueLink);
 
-        $this->log->addDebug("Create IssueLink=\n".$data);
+        $this->log->debug("Create IssueLink=\n".$data);
 
         $url = $this->uri.'/issueLink';
         $type = 'POST';
@@ -32,7 +32,7 @@ public function addIssueLink($issueLink)
      */
     public function getIssueLinkTypes()
     {
-        $this->log->addInfo("getIssueLinkTYpes=\n");
+        $this->log->info("getIssueLinkTYpes=\n");
 
         $url = $this->uri.'/issueLinkType';
 
diff --git a/src/JiraClient.php b/src/JiraClient.php
index 2b7af31d..3fed04c9 100644
--- a/src/JiraClient.php
+++ b/src/JiraClient.php
@@ -6,6 +6,7 @@
 use JiraRestApi\Configuration\DotEnvConfiguration;
 use Monolog\Handler\StreamHandler;
 use Monolog\Logger as Logger;
+use Psr\Log\LoggerInterface;
 
 /**
  * Interact jira server with REST API.
@@ -64,7 +65,7 @@ class JiraClient
      * @throws JiraException
      * @throws \Exception
      */
-    public function __construct(ConfigurationInterface $configuration = null, Logger $logger = null, $path = './')
+    public function __construct(ConfigurationInterface $configuration = null, LoggerInterface $logger = null, $path = './')
     {
         if ($configuration === null) {
             if (!file_exists($path.'.env')) {
@@ -172,9 +173,9 @@ public function exec($context, $post_data = null, $custom_request = null, $cooki
         $url = $this->createUrlByContext($context);
 
         if (is_string($post_data)) {
-            $this->log->addInfo("Curl $custom_request: $url JsonData=".$post_data);
+            $this->log->info("Curl $custom_request: $url JsonData=".$post_data);
         } elseif (is_array($post_data)) {
-            $this->log->addInfo("Curl $custom_request: $url JsonData=".json_encode($post_data, JSON_UNESCAPED_UNICODE));
+            $this->log->info("Curl $custom_request: $url JsonData=".json_encode($post_data, JSON_UNESCAPED_UNICODE));
         }
 
         $ch = curl_init();
@@ -227,7 +228,7 @@ public function exec($context, $post_data = null, $custom_request = null, $cooki
             curl_setopt($ch, CURLOPT_PROXYUSERPWD, "$username:$password");
         }
 
-        $this->log->addDebug('Curl exec='.$url);
+        $this->log->debug('Curl exec='.$url);
         $response = curl_exec($ch);
 
         // if request failed or have no result.
@@ -247,7 +248,7 @@ public function exec($context, $post_data = null, $custom_request = null, $cooki
             // HostNotFound, No route to Host, etc Network error
             $msg = sprintf('CURL Error: http response=%d, %s', $this->http_response, $body);
 
-            $this->log->addError($msg);
+            $this->log->error($msg);
 
             throw new JiraException($msg);
         } else {
@@ -291,7 +292,7 @@ private function createUploadHandle($url, $upload_file)
             curl_setopt($ch, CURLOPT_POSTFIELDS,
                 ['file' => '@'.$attachments.';filename='.$filename]);
 
-            $this->log->addDebug('using legacy file upload');
+            $this->log->debug('using legacy file upload');
         } else {
             // CURLFile require PHP > 5.5
             $attachments = new \CURLFile(realpath($upload_file));
@@ -300,7 +301,7 @@ private function createUploadHandle($url, $upload_file)
             curl_setopt($ch, CURLOPT_POSTFIELDS,
                 ['file' => $attachments]);
 
-            $this->log->addDebug('using CURLFile='.var_export($attachments, true));
+            $this->log->debug('using CURLFile='.var_export($attachments, true));
         }
 
         $this->authorization($ch);
@@ -320,7 +321,7 @@ private function createUploadHandle($url, $upload_file)
 
         curl_setopt($ch, CURLOPT_VERBOSE, $this->getConfiguration()->isCurlOptVerbose());
 
-        $this->log->addDebug('Curl exec='.$url);
+        $this->log->debug('Curl exec='.$url);
 
         return $ch;
     }
@@ -385,7 +386,7 @@ public function upload($context, $filePathArray)
                 // HostNotFound, No route to Host, etc Network error
                 $result_code = -1;
                 $body = 'CURL Error: = '.$body;
-                $this->log->addError($body);
+                $this->log->error($body);
             } else {
                 // if request was ok, parsing http response code.
                 $result_code = $this->http_response = curl_getinfo($ch, CURLINFO_HTTP_CODE);
@@ -395,7 +396,7 @@ public function upload($context, $filePathArray)
                     $body = 'CURL HTTP Request Failed: Status Code : '
                         .$this->http_response.', URL:'.$url;
 
-                    $this->log->addError($body);
+                    $this->log->error($body);
                 }
             }
         }
@@ -416,11 +417,11 @@ public function upload($context, $filePathArray)
     protected function closeCURLHandle(array $chArr, $mh, $body, $result_code)
     {
         foreach ($chArr as $ch) {
-            $this->log->addDebug('CURL Close handle..');
+            $this->log->debug('CURL Close handle..');
             curl_multi_remove_handle($mh, $ch);
             curl_close($ch);
         }
-        $this->log->addDebug('CURL Multi Close handle..');
+        $this->log->debug('CURL Multi Close handle..');
         curl_multi_close($mh);
         if ($result_code != 200) {
             // @TODO $body might have not been defined
@@ -458,7 +459,7 @@ protected function authorization($ch, $cookieFile = null)
             curl_setopt($ch, CURLOPT_COOKIEJAR, $cookieFile);
             curl_setopt($ch, CURLOPT_COOKIEFILE, $cookieFile);
 
-            $this->log->addDebug('Using cookie..');
+            $this->log->debug('Using cookie..');
         }
 
         // if cookie file not exist, using id/pwd login
@@ -554,7 +555,7 @@ public function download($url, $outDir, $file, $cookieFile = null)
 
         curl_setopt($ch, CURLOPT_VERBOSE, $this->getConfiguration()->isCurlOptVerbose());
 
-        $this->log->addDebug('Curl exec='.$url);
+        $this->log->debug('Curl exec='.$url);
         $response = curl_exec($ch);
 
         // if request failed.
@@ -575,7 +576,7 @@ public function download($url, $outDir, $file, $cookieFile = null)
             // HostNotFound, No route to Host, etc Network error
             $msg = sprintf('CURL Error: http response=%d, %s', $this->http_response, $body);
 
-            $this->log->addError($msg);
+            $this->log->error($msg);
 
             throw new JiraException($msg);
         } else {
diff --git a/src/Priority/PriorityService.php b/src/Priority/PriorityService.php
index d385c5db..83d99879 100644
--- a/src/Priority/PriorityService.php
+++ b/src/Priority/PriorityService.php
@@ -23,7 +23,7 @@ public function getAll()
     {
         $ret = $this->exec($this->uri, null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         $priorityData = json_decode($ret);
         $priorities = [];
@@ -49,7 +49,7 @@ public function get($priorityId)
     {
         $ret = $this->exec($this->uri."/$priorityId", null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         $priority = $this->json_mapper->map(json_decode($ret), new Priority());
 
diff --git a/src/Project/ProjectService.php b/src/Project/ProjectService.php
index 157d4959..ae1dfe30 100644
--- a/src/Project/ProjectService.php
+++ b/src/Project/ProjectService.php
@@ -46,7 +46,7 @@ public function get($projectIdOrKey)
     {
         $ret = $this->exec($this->uri."/$projectIdOrKey", null);
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $prj = $this->json_mapper->map(
             json_decode($ret), new Project()
@@ -103,7 +103,7 @@ public function getProjectTypes()
     {
         $ret = $this->exec($this->uri.'/type');
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $json = json_decode($ret);
         $results = array_map(function ($elem) {
@@ -125,7 +125,7 @@ public function getProjectType($key)
     {
         $ret = $this->exec($this->uri."/type/$key");
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $type = $this->json_mapper->map(
             json_decode($ret, false), new ProjectType()
@@ -146,7 +146,7 @@ public function getAccessibleProjectType($key)
     {
         $ret = $this->exec($this->uri."/type/$key/accessible");
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $type = $this->json_mapper->map(
             json_decode($ret, false), new ProjectType()
@@ -181,7 +181,7 @@ public function getVersionsPagenated($projectIdOrKey, $queryParam = [])
 
         $ret = $this->exec($this->uri."/$projectIdOrKey/version".$param);
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         //@see https://docs.atlassian.com/jira/REST/server/#api/2/project-getProjectVersions
         $json = json_decode($ret);
@@ -206,7 +206,7 @@ public function getVersions($projectIdOrKey)
     {
         $ret = $this->exec($this->uri."/$projectIdOrKey/versions");
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $versions = $this->json_mapper->mapArray(
             json_decode($ret, false), new \ArrayObject(), '\JiraRestApi\Issue\Version'
@@ -229,7 +229,7 @@ public function getVersion($projectIdOrKey, $versionName)
     {
         $ret = $this->exec($this->uri."/$projectIdOrKey/versions");
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $versions = $this->json_mapper->mapArray(
             json_decode($ret, false), new \ArrayObject(), '\JiraRestApi\Issue\Version'
@@ -259,7 +259,7 @@ public function createProject($project)
 
         $ret = $this->exec($this->uri, $data, 'POST');
 
-        $this->log->addInfo('createProject Result='.$ret);
+        $this->log->info('createProject Result='.$ret);
 
         return $this->json_mapper->map(
             json_decode($ret), new Project()
@@ -285,7 +285,7 @@ public function updateProject($project, $projectIdOrKey)
 
         $ret = $this->exec($this->uri.'/'.$projectIdOrKey, $data, 'PUT');
 
-        $this->log->addInfo('updateProject Result='.$ret);
+        $this->log->info('updateProject Result='.$ret);
 
         return $this->json_mapper->map(
             json_decode($ret), new Project()
diff --git a/src/Sprint/SprintService.php b/src/Sprint/SprintService.php
index c21278f3..f50a173b 100644
--- a/src/Sprint/SprintService.php
+++ b/src/Sprint/SprintService.php
@@ -47,7 +47,7 @@ public function getSprint($sprintId)
     {
         $ret = $this->exec($this->uri.'/'.$sprintId, null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         return $sprint = $this->json_mapper->map(
             json_decode($ret), new Sprint()
diff --git a/src/User/UserService.php b/src/User/UserService.php
index 42f9f899..218e65ff 100644
--- a/src/User/UserService.php
+++ b/src/User/UserService.php
@@ -25,7 +25,7 @@ public function create($user)
     {
         $data = json_encode($user);
 
-        $this->log->addInfo("Create User=\n".$data);
+        $this->log->info("Create User=\n".$data);
 
         $ret = $this->exec($this->uri, $data, 'POST');
 
@@ -51,7 +51,7 @@ public function get($paramArray)
 
         $ret = $this->exec($this->uri.$queryParam, null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         return $this->json_mapper->map(
                 json_decode($ret), new User()
@@ -74,7 +74,7 @@ public function findUsers($paramArray)
 
         $ret = $this->exec($this->uri.'/search'.$queryParam, null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         $userData = json_decode($ret);
         $users = [];
@@ -107,7 +107,7 @@ public function findAssignableUsers($paramArray)
 
         $ret = $this->exec($this->uri.'/assignable/search'.$queryParam, null);
 
-        $this->log->addInfo("Result=\n".$ret);
+        $this->log->info("Result=\n".$ret);
 
         $userData = json_decode($ret);
         $users = [];
diff --git a/src/Version/VersionService.php b/src/Version/VersionService.php
index 716913a6..8f23cf36 100644
--- a/src/Version/VersionService.php
+++ b/src/Version/VersionService.php
@@ -29,7 +29,7 @@ public function create($version)
         }
         $data = json_encode($version);
 
-        $this->log->addInfo("Create Version=\n".$data);
+        $this->log->info("Create Version=\n".$data);
 
         $ret = $this->exec($this->uri, $data, 'POST');
 
@@ -63,7 +63,7 @@ public function get($id)
     {
         $ret = $this->exec($this->uri.'/'.$id);
 
-        $this->log->addInfo('Result='.$ret);
+        $this->log->info('Result='.$ret);
 
         $json = json_decode($ret);
         $results = array_map(function ($elem) {