diff --git a/heat/engine/service.py b/heat/engine/service.py
index 7b8df0d06b..5d05627faf 100644
--- a/heat/engine/service.py
+++ b/heat/engine/service.py
@@ -151,10 +151,6 @@ class ThreadGroup(threadgroup.ThreadGroup):
             self.threads.append(th)
         return th
 
-    def wait(self):
-        """Wait for all threads in the group to complete."""
-        self.waitall()
-
 
 class ThreadGroupManager(object):
 
diff --git a/requirements.txt b/requirements.txt
index b198d05597..45d500b98f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ oslo.middleware>=3.31.0 # Apache-2.0
 oslo.policy>=4.5.0 # Apache-2.0
 oslo.reports>=1.18.0 # Apache-2.0
 oslo.serialization>=2.25.0 # Apache-2.0
-oslo.service[threading]>=4.2.0 # Apache-2.0
+oslo.service[threading]>=4.2.2 # Apache-2.0
 oslo.upgradecheck>=1.3.0 # Apache-2.0
 oslo.utils>=4.5.0 # Apache-2.0
 osprofiler>=1.4.0 # Apache-2.0