diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4f057729fa34..b672cc59accb 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -5,3 +5,4 @@ changelog>=0.5.6,<0.6
 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 cc6fc587f1fd..b4f966dbaead 100644
--- a/pdns/dnsdistdist/docs/requirements.txt
+++ b/pdns/dnsdistdist/docs/requirements.txt
@@ -5,3 +5,4 @@ changelog>=0.5.6,<0.6
 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 448fa8d4e697..601c62c060c9 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