diff --git a/requirements_dev.txt b/requirements_dev.txt
index fb5f21a..ae15a3e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@
 -r requirements_test.txt
 pytest-django==3.4.4
 Django==2.1.5
-tox==3.6.1
+tox==3.8.1
 
 # docs
 Sphinx==1.8.3