diff --git a/requirements/tox.txt b/requirements/tox.txt
index 745b6e2..ed90da3 100644
--- a/requirements/tox.txt
+++ b/requirements/tox.txt
@@ -5,4 +5,4 @@
 -r test.txt
 
 tox==2.9.1; (python_version > '3.0' and python_version < '3.4')  # pyup: ignore
-tox==3.14.0; (python_version > '2.7' and python_version < '3.0') or python_version > '3.4'
+tox==3.14.3; (python_version > '2.7' and python_version < '3.0') or python_version > '3.4'