diff --git a/requirements.txt b/requirements.txt
index f902a01b..0aea43f5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-pbr>=1.8 # Apache-2.0
+pbr<2.0.0,>=1.8 # Apache-2.0
 alembic>=0.8.10 # MIT
 debtcollector>=1.2.0 # Apache-2.0
 oslo.i18n>=2.1.0 # Apache-2.0