diff --git a/spark/requirements.txt b/spark/requirements.txt
index 3714f20..58656cc 100644
--- a/spark/requirements.txt
+++ b/spark/requirements.txt
@@ -114,7 +114,7 @@ termcolor==1.1.0
 terminado==0.8.3
 testpath==0.4.4
 threadpoolctl==2.1.0
-tornado==6.0.3
+tornado==6.4.2
 tqdm==4.50.2
 traitlets==4.3.3
 urllib3==1.26.5