diff --git a/docker/dev.requirements.txt b/docker/dev.requirements.txt
index 76faae615..ae5d3e665 100644
--- a/docker/dev.requirements.txt
+++ b/docker/dev.requirements.txt
@@ -229,7 +229,7 @@ threadpoolctl==3.2.0
 tinycss2==1.2.1
 toml==0.10.2
 tomli==2.0.1
-tornado==6.3.3
+tornado==6.4.2
 tqdm==4.66.1
 traitlets==5.9.0
 twine==4.0.2