diff --git a/hawkular/alerts.py b/hawkular/alerts.py
index e1cf01c..37bfcd1 100644
--- a/hawkular/alerts.py
+++ b/hawkular/alerts.py
@@ -217,6 +217,17 @@ def create_group_dampening(self, group_id, dampening):
         url = self._service_url(['triggers', 'groups', group_id, 'dampenings'])
         return Dampening(self._post(url, data))
 
+    def update_group_dampening(self, group_id, dampening_id, dampening):
+        """
+        Update an existing group dampening
+        :param group_id: Group Trigger id attached to dampening
+        :param dampening_id: id of the dampening to be updated
+        :return: Group Dampening created
+        """
+        data = self._serialize_object(dampening)
+        url = self._service_url(['triggers', 'groups', group_id, 'dampenings', dampening_id])
+        return Dampening(self._put(url, data))
+
     def delete_group_dampening(self, group_id, dampening_id):
         """
         Delete an existing group dampening
diff --git a/tests/test_alerts.py b/tests/test_alerts.py
index 3a2dd4b..d67cca1 100644
--- a/tests/test_alerts.py
+++ b/tests/test_alerts.py
@@ -217,9 +217,9 @@ def test_create_groups(self):
         m1.data_id_map = {'my-metric-id': 'my-metric-id-member1'}
 
         dampening = Dampening()
-        dampening.dampening_id = 'a-group-dampening'
         dampening.trigger_mode = TriggerMode.FIRING
         dampening.type = DampeningType.STRICT
+        dampening.trigger_id = 'a-group-trigger'
 
         tc = self.client.create_group_trigger(t)
         self.assertEqual(tc.type, TriggerType.GROUP)
@@ -230,15 +230,24 @@ def test_create_groups(self):
         gm = self.client.get_group_members('a-group-trigger')
         self.assertEqual(len(gm), 1)
         self.assertEqual(gm[0].id, 'member1')
+
+        # Create group trigger dampening
         self.client.create_group_dampening('a-group-trigger', dampening)
         gt = self.client.get_trigger('a-group-trigger', full=True)
-        gd = gt.dampenings
-        self.assertEqual(len(gd), 1)
-        self.assertEqual(gd[0].trigger_mode, 'FIRING')
-        self.assertEqual(gd[0].type, 'STRICT')
+        gds = gt.dampenings
+        self.assertEqual(len(gds), 1)
+        self.assertEqual(gds[0].trigger_mode, 'FIRING')
+        self.assertEqual(gds[0].type, 'STRICT')
+
+        # Update group trigger dampening
+        dampening.type = DampeningType.STRICT_TIME
+        dampening.eval_time_setting = 5
+        dampening.dampening_id = gds[0].dampening_id
+        gd = self.client.update_group_dampening('a-group-trigger', dampening.dampening_id, dampening)
+        self.assertEqual(gd.type, 'STRICT_TIME')
 
         # Delete group trigger dampening
-        self.client.delete_group_dampening('a-group-trigger', gd[0].dampening_id)
+        self.client.delete_group_dampening('a-group-trigger', dampening.dampening_id)
         gt = self.client.get_trigger('a-group-trigger', full=True)
         self.assertFalse(gt.dampenings)