diff --git a/doc/en/requirements.txt b/doc/en/requirements.txt
index 5b49cb7fc..89446634e 100644
--- a/doc/en/requirements.txt
+++ b/doc/en/requirements.txt
@@ -5,3 +5,6 @@ sphinx-removed-in>=0.2.0
 sphinx>=3.1,<4
 sphinxcontrib-trio
 sphinxcontrib-svg2pdfconverter
+
+# XXX: sphinx<4 is broken with latest jinja2
+jinja2<3.1