diff --git a/requirements_dev.txt b/requirements_dev.txt
index ae557238..d8bb6f1d 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -95,7 +95,7 @@ snowballstemmer==1.2.1    # via pydocstyle, sphinx
 sphinx==1.7.5
 sphinxcontrib-websupport==1.1.0  # via sphinx
 termcolor==1.1.0          # via pytest-sugar
-tox==3.0.0
+tox==3.14.3
 traitlets==4.3.2          # via ipython
 urllib3==1.23             # via requests
 virtualenv==16.0.0        # via tox