diff --git a/requirements.txt b/requirements.txt
index b358c17..ab2bdb0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,6 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-pbr>=2.0.0 # Apache-2.0
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
 requests!=2.12.2,!=2.13.0,>=2.10.0 # Apache-2.0
 six>=1.9.0 # MIT