diff --git a/docs/requirements.txt b/docs/requirements.txt
index f1d2ac2..9a4c268 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,6 @@
 alabaster<0.8
 jinja2<3.2
-markupsafe<2
+markupsafe<4
 readme-renderer<23
 sphinx>=5,<9
 sphinxcontrib-websupport<2.1