diff --git a/requirements.txt b/requirements.txt
index 07c6fc9..f2ddc7b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 iso8601>=0.1.11 # MIT
 lxml!=3.7.0,>=2.3 # BSD
-oslo.config>=4.0.0 # Apache-2.0
+oslo.config!=4.3.0,!=4.4.0,>=4.0.0 # Apache-2.0
 docutils>=0.11 # OSI-Approved Open Source, Public Domain
 sphinx!=1.6.1,>=1.5.1 # BSD
 demjson # GLGPLv3+