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-rw-r--r--tox.ini2
1 files changed, 2 insertions, 0 deletions
diff --git a/tox.ini b/tox.ini
index 9ff70fe312..a6d10537ae 100644
--- a/tox.ini
+++ b/tox.ini
@@ -189,5 +189,7 @@ commands=
 [testenv:mypy]
 deps =
     {[base]deps}
+    # Type hints are broken with Twisted > 20.3.0, see https://github.com/matrix-org/synapse/issues/9513
+    twisted==20.3.0
 extras = all,mypy
 commands = mypy