diff --git a/requirements.txt b/requirements.txt
index 9318afafa..8e956a043 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 linkify-it-py
-plone-sphinx-theme
+plone-sphinx-theme<2
 sphinx-autobuild
 sphinx-copybutton
 sphinx-design  # Documentation only