diff --git a/requirements.txt b/requirements.txt
index 0a3bb8a..eea79af 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance.
 
-pbr>=1.6
+pbr>=1.8
 wrapt