diff --git a/requirements.txt b/requirements.txt
index 4568208..bdf6896 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,4 +21,4 @@ oslo.rootwrap>=2.0.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0
 oslo.service>=1.0.0 # Apache-2.0
 oslo.utils>=3.4.0 # Apache-2.0
-keystonemiddleware>=4.0.0 # Apache-2.0
+keystonemiddleware!=4.1.0,>=4.0.0 # Apache-2.0