diff --git a/requirements.txt b/requirements.txt
index 148bd15..94cc1f1 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!=2.1.0,>=2.0.0 # Apache-2.0
+pbr>=2.0.0,!=2.1.0 # Apache-2.0
 python-heatclient>=1.6.1
 python-neutronclient>=6.3.0,<6.8
 oslo.serialization>=2.18.0,!=2.19.1 # Apache-2.0