diff --git a/lib/Github/Api/PullRequest.php b/lib/Github/Api/PullRequest.php
index aed711a6c34..c322c00f003 100644
--- a/lib/Github/Api/PullRequest.php
+++ b/lib/Github/Api/PullRequest.php
@@ -102,13 +102,13 @@ public function create($username, $repository, array $params)
         return $this->post('repos/'.urlencode($username).'/'.urlencode($repository).'/pulls', $params);
     }
 
-    public function update($username, $repository, array $params)
+    public function update($username, $repository, $id, array $params)
     {
         if (isset($params['state']) && !in_array($params['state'], array('open', 'closed'))) {
             $params['state'] = 'open';
         }
 
-        return $this->patch('repos/'.urlencode($username).'/'.urlencode($repository).'/pulls', $params);
+        return $this->patch('repos/'.urlencode($username).'/'.urlencode($repository).'/pulls/'.urlencode($id), $params);
     }
 
     public function merged($username, $repository, $id)
diff --git a/lib/Github/Api/Repo.php b/lib/Github/Api/Repo.php
index 0b7deab20ef..1bac1ed8687 100644
--- a/lib/Github/Api/Repo.php
+++ b/lib/Github/Api/Repo.php
@@ -331,4 +331,25 @@ public function watchers($username, $repository, $page = 1)
             'page' => $page
         ));
     }
+
+    /**
+     * Perform a merge
+     * @link http://developer.github.com/v3/repos/merging/
+     *
+     * @param  string      $username
+     * @param  string      $repository
+     * @param  string      $base        The name of the base branch that the head will be merged into.
+     * @param  string      $head        The head to merge. This can be a branch name or a commit SHA1.
+     * @param  string      $message     Commit message to use for the merge commit. If omitted, a default message will be used.
+     *
+     * @return array|null
+     */
+    public function merge($username, $repository, $base, $head, $message = null)
+    {
+        return $this->post('repos/'.urlencode($username).'/'.urlencode($repository).'/merges', array(
+            'base'           => $base,
+            'head'           => $head,
+            'commit_message' => $message
+        ));
+    }
 }