diff --git a/test-requirements.txt b/test-requirements.txt
index 1d3954b..3588509 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,7 +10,7 @@ oslosphinx>=4.7.0 # Apache-2.0
 sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
 
 # for testing optional parts
-oslo.config>=3.14.0 # Apache-2.0
+oslo.config!=3.18.0,>=3.14.0 # Apache-2.0
 eventlet!=0.18.3,>=0.18.2 # MIT
 greenlet>=0.3.2 # MIT