diff --git a/pip-sample/requirements.txt b/pip-sample/requirements.txt
index 680d0816..dff33847 100644
--- a/pip-sample/requirements.txt
+++ b/pip-sample/requirements.txt
@@ -55,7 +55,7 @@ simplegeneric==0.8.1
 six==1.11.0
 terminado==0.8.1
 testpath==0.4.1
-tornado==5.1.1
+tornado==6.4.2
 traitlets==4.3.2
 tweepy==3.6.0
 urllib3==1.23