diff --git a/test-requirements.txt b/test-requirements.txt
index 6f0b4ee4e..4f9754cdd 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -17,7 +17,7 @@ mox3!=0.19.0,>=0.7.0 # Apache-2.0
 
 # Docs Requirements
 oslosphinx>=4.7.0 # Apache-2.0
-sphinx>=1.5.1 # BSD
+sphinx!=1.6.1,>=1.5.1 # BSD
 reno>=1.8.0 # Apache-2.0
 
 # Horizon requirements