diff --git a/requirements-dev.txt b/requirements-dev.txt
index 589ca7c54..f346439af 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,7 +4,7 @@
 -r requirements-hyperopt.txt
 
 coveralls==1.8.2
-flake8==3.7.8
+flake8==3.7.9
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==3.0.0
 mypy==0.740