diff --git a/requirements.txt b/requirements.txt
index f00a9dc37..9d82a670c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ futurist>=0.1.2 # Apache-2.0
 oslo.config>=2.3.0 # Apache-2.0
 oslo.context>=0.2.0 # Apache-2.0
 oslo.log>=1.8.0 # Apache-2.0
-oslo.utils>=2.4.0 # Apache-2.0
+oslo.utils!=2.6.0,>=2.4.0 # Apache-2.0
 oslo.serialization>=1.4.0 # Apache-2.0
 oslo.service>=0.10.0 # Apache-2.0
 oslo.i18n>=1.5.0 # Apache-2.0