diff --git a/requirements.txt b/requirements.txt
index 8d85332..c29be86 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ molecule==2.14.0
 pytest==3.5.1
 python-vagrant==0.5.15
 testinfra==1.13.0
-tox==3.0.0
+tox==3.23.1