diff --git a/ai_dubs/requirements.txt b/ai_dubs/requirements.txt
index d94949a..c17a419 100644
--- a/ai_dubs/requirements.txt
+++ b/ai_dubs/requirements.txt
@@ -102,7 +102,7 @@ termcolor==1.1.0
 terminado==0.9.2
 testpath==0.4.4
 toml==0.10.2
-tornado==6.1
+tornado==6.3.3
 tqdm==4.56.0
 traitlets==5.0.5
 typing-extensions==3.7.4.3