diff --git a/requirements-dev.txt b/requirements-dev.txt
index cd02f10..7a4fe68 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,7 +5,7 @@ flake8==3.7.7
 idna==2.8
 mccabe==0.6.1
 pycodestyle==2.5.0
-pyflakes==2.1.1
+pyflakes==2.3.1
 requests==2.21.0
 urllib3==1.25
 pytest-cov==2.6.1