diff --git a/doc/requirements.txt b/doc/requirements.txt
index 12390ff..a4fd173 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -11,6 +11,6 @@
 
 sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
-openstackdocstheme>=1.18.1 # Apache-2.0
+openstackdocstheme>=1.20.0 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0