diff --git a/requirements-dev.txt b/requirements-dev.txt
index c16e387ef..030b4b2a2 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,7 +4,7 @@
 -r requirements-hyperopt.txt
 
 coveralls==2.1.2
-flake8==3.8.3
+flake8==3.8.4
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==4.1.0
 mypy==0.782