diff --git a/requirements.txt b/requirements.txt
index 85c7fd03..aebe0e54 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ flake8==3.7.6
 
 # Testing
 # ------------------------------------------------------------------------------
-tox==3.8.3
+tox==3.8.4
 pytest==4.4.0
 pytest_cases==1.5.1
 pytest-cookies==0.3.0