diff --git a/clean-nbs/requirements.lock.txt b/clean-nbs/requirements.lock.txt
index 0933df7..47e9857 100644
--- a/clean-nbs/requirements.lock.txt
+++ b/clean-nbs/requirements.lock.txt
@@ -87,7 +87,7 @@ testpath==0.5.0
 textwrap3==0.9.2
 threadpoolctl==2.1.0
 toml==0.10.2
-tornado==6.1
+tornado==6.3.3
 tqdm==4.61.2
 traitlets==5.0.5
 typing-extensions==3.10.0.0