diff --git a/docs/requirements.txt b/docs/requirements.txt
index 669c19b98508..622263e53d84 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -5,3 +5,4 @@ git+https://github.com/pieterlexis/sphinx-changelog@render-tags
 sphinxcontrib-fulltoc
 guzzle_sphinx_theme
 docutils!=0.15,<0.18
+jinja2<3.1.0
diff --git a/pdns/dnsdistdist/docs/requirements.txt b/pdns/dnsdistdist/docs/requirements.txt
index c9a188e66396..5e3da903a230 100644
--- a/pdns/dnsdistdist/docs/requirements.txt
+++ b/pdns/dnsdistdist/docs/requirements.txt
@@ -5,3 +5,4 @@ git+https://github.com/pieterlexis/sphinx-changelog@render-tags
 sphinxcontrib-httpdomain
 sphinxcontrib-fulltoc
 docutils!=0.15,<0.18
+jinja2<3.1.0
diff --git a/pdns/recursordist/docs/requirements.txt b/pdns/recursordist/docs/requirements.txt
index 5d88e2afefc3..573799b8527d 100644
--- a/pdns/recursordist/docs/requirements.txt
+++ b/pdns/recursordist/docs/requirements.txt
@@ -6,3 +6,4 @@ guzzle_sphinx_theme
 sphinxcontrib.httpdomain
 sphinxcontrib-fulltoc
 docutils!=0.15,<0.18
+jinja2<3.1.0