diff --git a/.travis.yml b/.travis.yml
index 3661eb50b..04467f208 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ branches:
 php: 
   - 5.3
   - 5.4
+  - 5.5
 
 services: mongodb
 
diff --git a/README.md b/README.md
index 8c2c7913b..e5ac5f610 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,8 @@ $users = User::where('votes', '>', 100)->orWhere('name', 'John')->get();
 $users = User::whereIn('age', array(16, 18, 20))->get();
 ```
 
+When using `whereNotIn` objects will be returned if the field is non existant. Combine with `whereNotNull('age')` to leave out those documents.
+
 **Using Where Between**
 
 ```php
@@ -181,3 +183,30 @@ $user = Comment::where('body', 'like', '%spam%')->get();
 **Inserts, updates and deletes**
 
 All basic insert, update, delete and select methods should be implemented.
+
+**Increments & decrements**
+
+Perform increments (default 1) on specified attributes.
+Attention: without a where-clause, every object will be modified.
+
+```php
+User::where('name', 'John Doe')->increment('age');
+User::where('name', 'Bart De Wever')->decrement('weight', 50);
+```
+
+The number of updated objects is returned.
+
+```php
+$count = User->increment('age');
+echo $count;
+```
+
+will return the number of users where `age` is a valid field.
+
+These functions also allow for a third attribute:
+
+```php
+User::where('age', '29')->increment('age', 1, array('group' => 'thirty something'));
+
+User::where('bmi', 30)->decrement('bmi', 1, array('category' => 'overweight'));
+```
\ No newline at end of file
diff --git a/src/Jenssegers/Mongodb/Builder.php b/src/Jenssegers/Mongodb/Builder.php
index 1dcbf6bed..faec737b4 100644
--- a/src/Jenssegers/Mongodb/Builder.php
+++ b/src/Jenssegers/Mongodb/Builder.php
@@ -286,6 +286,49 @@ public function update(array $values)
         return 0;
     }
 
+    /**
+     * Increment a column's value by a given amount.
+     *
+     * @param  string  $column
+     * @param  int     $amount
+     * @param  array   $extra
+     * @return int
+     */
+    public function increment($column, $amount = 1, array $extra = array())
+    {
+        // build update statement
+        $update = array(
+            '$inc' => array($column => $amount),
+            '$set' => $extra,
+        );
+
+        // protect
+        $this->whereNotNull($column);
+
+        // perform
+        $result = $this->collection->update($this->compileWheres(), $update, array('multiple' => true));
+
+        if (1 == (int) $result['ok'])
+        {
+            return $result['n'];
+        }
+
+        return 0;
+    }
+
+    /**
+     * Decrement a column's value by a given amount.
+     *
+     * @param  string  $column
+     * @param  int     $amount
+     * @param  array   $extra
+     * @return int
+     */
+    public function decrement($column, $amount = 1, array $extra = array())
+    {
+        return $this->increment($column, -1 * $amount, $extra);
+    }
+
     /**
      * Delete a record from the database.
      *
@@ -429,6 +472,13 @@ private function compileWhereIn($where)
         return array($column => array('$in' => $values));
     }
 
+    private function compileWhereNotIn($where)
+    {
+        extract($where);
+
+        return array($column => array('$nin' => $values));
+    }
+
     private function compileWhereNull($where)
     {
         $where['operator'] = '=';
diff --git a/tests/QueryTest.php b/tests/QueryTest.php
index 7615b9b2c..5d1ff4498 100644
--- a/tests/QueryTest.php
+++ b/tests/QueryTest.php
@@ -112,6 +112,12 @@ public function testSelect()
 		$this->assertEquals('John Doe', $user->name);
 		$this->assertEquals(null, $user->age);
 
+		$user = User::select('name', 'title')->first();
+
+		$this->assertEquals('John Doe', $user->name);
+		$this->assertEquals('admin', $user->title);
+		$this->assertEquals(null, $user->age);
+
 		$user = User::get(array('name'))->first();
 
 		$this->assertEquals('John Doe', $user->name);
@@ -143,12 +149,22 @@ public function testIn()
 
 		$users = User::whereIn('age', array(33, 35, 13))->get();
 		$this->assertEquals(6, count($users));
+
+		$users = User::whereNotIn('age', array(33, 35))->get();
+		$this->assertEquals(4, count($users));
+
+		$users = User::whereNotNull('age')
+		             ->whereNotIn('age', array(33, 35))->get();
+		$this->assertEquals(3, count($users));
 	}
 
 	public function testWhereNull()
 	{
 		$users = User::whereNull('age')->get();
 		$this->assertEquals(1, count($users));
+
+		$users = User::whereNotNull('age')->get();
+		$this->assertEquals(8, count($users));
 	}
 
 	public function testOrder()
@@ -173,6 +189,37 @@ public function testOffset()
 		$this->assertEquals('Jane Doe', $users[0]->name);
 	}
 
+	public function testIncrements()
+	{
+		User::where('name', 'John Doe')->increment('age');
+		User::where('name', 'John Doe')->increment('age', 2, array('title' => 'user'));
+
+		$user = User::where('name', 'John Doe')->first();
+		$this->assertEquals(38, $user->age);
+		$this->assertEquals('user', $user->title);
+
+		User::where('name', 'John Doe')->decrement('age');
+		$num = User::where('name', 'John Doe')->decrement('age', 2, array('title' => 'admin'));
+
+		$user = User::where('name', 'John Doe')->first();
+		$this->assertEquals(35, $user->age);
+		$this->assertEquals('admin', $user->title);
+		$this->assertEquals(1, $num);
+
+		User::increment('age');
+		User::increment('age', 2);
+
+		$user = User::where('name', 'Mark Moe')->first();
+		$this->assertEquals(26, $user->age);
+
+		User::decrement('age', 2);
+		$num = User::decrement('age');
+
+		$user = User::where('name', 'Mark Moe')->first();
+		$this->assertEquals(23, $user->age);
+		$this->assertEquals(8, $num);
+	}
+
 	public function testAggregates()
 	{
 		$this->assertEquals(9, User::count());
@@ -183,6 +230,9 @@ public function testAggregates()
 
 		$this->assertEquals(35, User::where('title', 'admin')->max('age'));
 		$this->assertEquals(37, User::where('title', 'user')->max('age'));
+	
+		$this->assertEquals(33, User::where('title', 'admin')->min('age'));
+		$this->assertEquals(13, User::where('title', 'user')->min('age'));
 	}
 
 	public function testGroupBy()