diff --git a/requirements-dev.txt b/requirements-dev.txt
index 6fb2e99..a92d885 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -18,7 +18,7 @@ cryptography==2.9.2       # via secretstorage
 distlib==0.3.0            # via virtualenv
 docutils==0.16            # via readme-renderer
 filelock==3.0.12          # via tox, virtualenv
-flake8==3.8.3             # via -r requirements-dev.in
+flake8==3.8.4             # via -r requirements-dev.in
 idna==2.9                 # via requests
 iniconfig==1.0.1          # via pytest
 isort==4.3.21             # via pylint