diff --git a/tox.ini b/tox.ini
index ebc63d85a..60b277331 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,4 +1,4 @@
-# Tox (http://tox.testrun.org/) is a tool for running tests
+# Tox (https://testrun.org/tox/latest/) is a tool for running tests
 # in multiple virtualenvs. This configuration file will run the
 # test suite on all supported python versions. To use it, "pip install tox"
 # and then run "tox" from this directory.