diff --git a/requirements.txt b/requirements.txt
index 39575d2b..6f67ec90 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,11 +2,11 @@
 # 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
 Babel!=2.4.0,>=2.3.4 # BSD
 
 os-brick>=1.8.0 # Apache-2.0
-os-win>=1.4.0 # Apache-2.0
+os-win>=2.0.0 # Apache-2.0
 oslo.config>=3.22.0 # Apache-2.0
 oslo.log>=3.22.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0