diff --git a/tests/requirements.txt b/tests/requirements.txt
index 446044f..e3c0a9f 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,4 +1,4 @@
-flake8==3.5.0
+flake8==3.7.9
 tox==3.4.0
 coverage==4.5.1
 cryptography==2.3.1