diff --git a/dev-requirements.txt b/dev-requirements.txt
index b1cd474..48b34d3 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -10,7 +10,7 @@ distlib==0.4.0
     # via virtualenv
 docutils==0.22.3
     # via readme-renderer
-filelock==3.19.1
+filelock==3.20.1
     # via
     #   tox
     #   virtualenv