diff --git a/requirements.txt b/requirements.txt
index 806b7a8a..193ceb5b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ WebOb>=1.2.3
 eventlet>=0.17.4
 greenlet>=0.3.2
 monotonic>=0.3 # Apache-2.0
-oslo.utils>=2.4.0 # Apache-2.0
+oslo.utils!=2.6.0,>=2.4.0 # Apache-2.0
 oslo.concurrency>=2.3.0 # Apache-2.0
 oslo.config>=2.3.0 # Apache-2.0
 oslo.log>=1.8.0 # Apache-2.0