diff --git a/requirements.in b/requirements.in
index 6a86da0aa..ba1f753b2 100644
--- a/requirements.in
+++ b/requirements.in
@@ -9,7 +9,7 @@ Flask-WTF==1.0.1
 wtforms==3.0.1
 Flask-Login==0.6.1
 werkzeug==2.1.2
-jinja2==3.1.2
+jinja2==3.0.3  # Can’t be upgraded until we are using Flask >= 2
 
 blinker==1.4
 pyexcel==0.7.0
diff --git a/requirements.txt b/requirements.txt
index ae4eae030..bc632b6f9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -91,7 +91,7 @@ itsdangerous==1.1.0
     #   flask
     #   flask-wtf
     #   notifications-utils
-jinja2==3.1.2
+jinja2==3.0.3
     # via
     #   -r requirements.in
     #   flask