diff --git a/changelog.d/9618.misc b/changelog.d/9618.misc
new file mode 100644
index 0000000000..14c7b78dd9
--- /dev/null
+++ b/changelog.d/9618.misc
@@ -0,0 +1 @@
+Fix incorrect type hints.
diff --git a/tox.ini b/tox.ini
index a6d10537ae..9ff70fe312 100644
--- a/tox.ini
+++ b/tox.ini
@@ -189,7 +189,5 @@ 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