diff --git a/requirements.txt b/requirements.txt
index e85555288d..bac2dd236b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,9 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-dnspython>=1.9.4
+pbr>=1.6
+dnspython>=1.12.0;python_version<'3.0'
+dnspython3>=1.12.0;python_version>='3.0'
 eventlet>=0.16.1,!=0.17.0
 greenlet>=0.3.1
 netifaces>=0.5,!=0.10.0,!=0.10.1