diff --git a/test-requirements.txt b/test-requirements.txt
index 7057ec8..cec9c78 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -20,4 +20,4 @@ reno>=1.6.2 # Apache2
 
 #api-ref
 openstackdocstheme>=1.5.0 # Apache-2.0
-os-api-ref>=1.0.0 # Apache-2.0
+os-api-ref>=1.4.0 # Apache-2.0