diff --git a/requirements_test.txt b/requirements_test.txt
index a3a2522..09746d6 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -2,7 +2,7 @@ Sphinx==1.6.3
 sphinx-rtd-theme==0.2.5b1
 pip==9.0.1
 wheel==0.29.0
-flake8==3.3.0
+flake8==3.4.1
 tox==2.7.0
 coverage==4.4.1
 pytest==3.1.3