diff --git a/requirements_dev.txt b/requirements_dev.txt
index fa5a459..51134f8 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -28,7 +28,7 @@ distlib==0.3.9
     # via virtualenv
 executing==2.1.0
     # via stack-data
-filelock==3.16.1
+filelock==3.20.3
     # via
     #   tox
     #   virtualenv