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-rw-r--r--synapse/python_dependencies.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index 1dd39f06cf..79ae06ce5d 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -74,7 +74,8 @@ REQUIREMENTS = [
     # Note: 21.1.0 broke `/sync`, see #9936
     "attrs>=19.2.0,!=21.1.0",
     "netaddr>=0.7.18",
-    "Jinja2>=2.9",
+    # Jinja2 3.1.0 removes the deprecated jinja2.Markup class, which we rely on.
+    "Jinja2<3.1.0",
     "bleach>=1.4.3",
     # We use `ParamSpec`, which was added in `typing-extensions` 3.10.0.0.
     "typing-extensions>=3.10.0",