diff --git a/mypy-requirements.txt b/mypy-requirements.txt
index 70e89d1005..7e36f0c0de 100644
--- a/mypy-requirements.txt
+++ b/mypy-requirements.txt
@@ -1,7 +1,7 @@
 mypy==0.990
 idna>=2.0.0
 cryptography>=1.3.4
-tornado>=6.1
+tornado>=6.4.2
 pytest>=6.2
 trustme==0.9.0
 types-backports