diff --git a/tools/code_format/requirements.txt b/tools/code_format/requirements.txt
index fca427f852a1..e62476d2074d 100644
--- a/tools/code_format/requirements.txt
+++ b/tools/code_format/requirements.txt
@@ -1,6 +1,6 @@
-flake8==3.9.0 \
-    --hash=sha256:12d05ab02614b6aee8df7c36b97d1a3b2372761222b19b58621355e82acddcff \
-    --hash=sha256:78873e372b12b093da7b5e5ed302e8ad9e988b38b063b61ad937f26ca58fc5f0
+flake8==3.9.1 \
+    --hash=sha256:3b9f848952dddccf635be78098ca75010f073bfe14d2c6bda867154bea728d2a \
+    --hash=sha256:1aa8990be1e689d96c745c5682b687ea49f2e05a443aff1f8251092b0014e378
 importlib-metadata==3.10.0 \
     --hash=sha256:d2d46ef77ffc85cbf7dac7e81dd663fde71c45326131bea8033b9bad42268ebe \
     --hash=sha256:c9db46394197244adf2f0b08ec5bc3cf16757e9590b02af1fca085c16c0d600a