diff --git a/requirements-dev.txt b/requirements-dev.txt
index d30fd724d..96d4a7af1 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,7 +1,7 @@
 # Include all requirements to run the bot.
 -r requirements.txt
 
-flake8==3.7.1
+flake8==3.7.3
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==1.1.0
 pytest==4.1.1