diff --git a/requirements.txt b/requirements.txt
index cc2a0785a..a4c93b5b5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,8 @@
 # date but we do not test them so no guarantee of having them all correct. If
 # you find any incorrect lower bounds, let us know or propose a fix.
 
+pbr>=2.0.0 # Apache-2.0
+
 futurist>=1.2.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.context>=5.3.0 # Apache-2.0