diff --git a/dev_requirements.txt b/dev_requirements.txt
index 2c7f35e..6859762 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -1,5 +1,5 @@
 mock
-pyflakes==2.0.0
+pyflakes==2.1.1
 # DocStringChecker currently only works with pylint 1.6.5. Upgrading causes it
 # to stop producing errors on bad docstrings.
 pylint==1.6.5