diff --git a/ml4h/tensorize/dataflow/requirements_ml4h_dataflow.txt b/ml4h/tensorize/dataflow/requirements_ml4h_dataflow.txt
index df3399d75..6ef2d049c 100644
--- a/ml4h/tensorize/dataflow/requirements_ml4h_dataflow.txt
+++ b/ml4h/tensorize/dataflow/requirements_ml4h_dataflow.txt
@@ -169,7 +169,7 @@ tifffile==2022.10.10
 tinycss2==1.2.1
 tomli==2.0.1
 toolz==0.12.0
-tornado==6.2
+tornado==6.3.3
 tqdm==4.64.1
 traitlets==5.8.1
 twisted==22.10.0