diff --git a/docs/rtd-requirements.txt b/docs/rtd-requirements.txt
index 8e9aebc4..6e11c0ca 100644
--- a/docs/rtd-requirements.txt
+++ b/docs/rtd-requirements.txt
@@ -60,7 +60,7 @@ Products.statusmessages==4.0
 Products.validation==2.0.1
 Pygments==2.7.4
 Record==2.13.0
-RestrictedPython==3.6.0
+RestrictedPython==8.1
 Sphinx==1.1.3
 Unidecode==0.04.1
 ZConfig==2.9.1