diff --git a/requirements.txt b/requirements.txt
index fd898c027..42d1ffb84 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-pbr>=0.5.16,<0.6
+pbr>=0.5.21,<1.0
 argparse
 cliff>=1.4
 httplib2
diff --git a/setup.py b/setup.py
index 15f4e9d54..2a0786a8b 100644
--- a/setup.py
+++ b/setup.py
@@ -18,5 +18,5 @@
 import setuptools
 
 setuptools.setup(
-    setup_requires=['pbr>=0.5.20'],
+    setup_requires=['pbr>=0.5.21,<1.0'],
     pbr=True)