diff --git a/requirements_dev.txt b/requirements_dev.txt
index 5427ac8..a0f25b0 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1 +1 @@
-tox==1.6.1
\ No newline at end of file
+tox==2.7.0
\ No newline at end of file