diff --git a/requirements.txt b/requirements.txt
index a22e829..0070b8d 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>=2.0.0 # Apache-2.0
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
 six>=1.9.0 # MIT
 wrapt>=1.7.0 # BSD License
 funcsigs>=0.4;python_version=='2.7' or python_version=='2.6' # Apache-2.0