diff --git a/.travis.yml b/.travis.yml
index 51b9075..a5306e7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,14 @@
+sudo: false
+
 language: php
 
 php:
   - 5.3
   - 5.4
+  - 5.5
 
 before_script:
-  - curl -s http://getcomposer.org/installer | php
-  - php composer.phar install --prefer-source --no-interaction --dev
+  - curl -sS http://getcomposer.org/installer | php
+  - php composer.phar install --prefer-source --no-interaction
 
 script: phpunit
diff --git a/src/Pixie/QueryBuilder/QueryBuilderHandler.php b/src/Pixie/QueryBuilder/QueryBuilderHandler.php
index 36d2a19..8af0eba 100644
--- a/src/Pixie/QueryBuilder/QueryBuilderHandler.php
+++ b/src/Pixie/QueryBuilder/QueryBuilderHandler.php
@@ -23,7 +23,7 @@ class QueryBuilderHandler
     protected $statements = array();
 
     /**
-     * @var PDO
+     * @var \PDO
      */
     protected $pdo;
 
@@ -434,7 +434,6 @@ public function delete()
 
         list($response, $executionTime) = $this->statement($queryObject->getSql(), $queryObject->getBindings());
         $this->fireEvents('after-delete', $queryObject, $executionTime);
-        
 
         return $response;
     }
@@ -790,6 +789,21 @@ public function join($table, $key, $operator = null, $value = null, $type = 'inn
         return $this;
     }
 
+    public function transaction(\Closure $callback)
+    {
+        try {
+            $this->pdo->beginTransaction();
+
+            $callback($this);
+            $this->pdo->commit();
+
+            return true;
+        } catch (\Exception $e) {
+            $this->pdo->rollBack();
+            return false;
+        }
+    }
+
     /**
      * @param      $table
      * @param      $key