diff --git a/docs/rtd-requirements.txt b/docs/rtd-requirements.txt
index 8e9aebc4..73aff6e8 100644
--- a/docs/rtd-requirements.txt
+++ b/docs/rtd-requirements.txt
@@ -58,7 +58,7 @@ Products.ZopeVersionControl==1.1.3
 Products.contentmigration==2.1.10
 Products.statusmessages==4.0
 Products.validation==2.0.1
-Pygments==2.7.4
+Pygments==2.20.0
 Record==2.13.0
 RestrictedPython==3.6.0
 Sphinx==1.1.3