diff --git a/requirements_dev.txt b/requirements_dev.txt
index e7f422e..9ac9786 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip==9.0.1
 punch.py==1.4.2
 watchdog==0.8.3
 flake8==3.4.1
-tox==2.9.1
+tox==3.2.1
 coverage==4.4.1
 Sphinx==1.6.4
 isort==4.2.15
\ No newline at end of file