diff --git a/doc/requirements.txt b/doc/requirements.txt
index 9888385fd..08de827af 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,5 @@
 openstackdocstheme>=2.2.1 # Apache-2.0
 reno>=3.1.0 # Apache-2.0
-sphinx>=2.0.0,!=2.1.0 # BSD
+sphinx>=2.1.1 # BSD
 sphinxcontrib-httpdomain>=1.8.1
 sphinxcontrib-pecanwsme>=0.10.0