diff --git a/requirements/dev.txt b/requirements/dev.txt
index eff14fc6..f96601b5 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -13,6 +13,6 @@ pyaml==17.8.0
 sphinx-issues==0.3.1
 sphinx_rtd_theme==0.2.4
 sphinxcontrib-paverutils==1.16.0
-tox==2.8.2
+tox==2.9.0
 twine==1.9.1
 wheel==0.30.0