diff --git a/requirements.txt b/requirements.txt
index 8b8b8c1f2..3819ff1d4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # 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
 cliff>=2.3.0 # Apache-2.0
 debtcollector>=1.2.0 # Apache-2.0
 iso8601>=0.1.11 # MIT