diff --git a/requirements/dev.txt b/requirements/dev.txt
index e059884..c96dbbe 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -14,7 +14,7 @@ colorama==0.4.6
     # via tox
 distlib==0.3.8
     # via virtualenv
-filelock==3.15.4
+filelock==3.20.3
     # via
     #   tox
     #   virtualenv