diff --git a/requirements_dev.txt b/requirements_dev.txt
index 207f4f5..3eaef0b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,6 +1,6 @@
 wheel==0.32.1
 flake8==3.5.0
-tox==3.4.0
+tox==3.6.0
 coverage==4.5.1
 coveralls==1.5.1
 pytest==3.10.0