diff --git a/requirements.txt b/requirements.txt
index 4172e4c..d5f1962 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -120,7 +120,7 @@ singledispatch==3.4.0.3
 six==1.10.0
 suds==0.4
 termcolor==1.1.0
-tornado==4.5.3
+tornado==6.4.2
 tox==2.9.1
 urllib3==1.21.1
 virtualenv==15.1.0