diff --git a/requirements.txt b/requirements.txt
index af2361f..f767f91 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-tornado==3.1.1
+tornado==6.3.3
 pandas==0.19.2
 scipy==0.18.1
 numpy==1.13.1