diff --git a/requirements.txt b/requirements.txt
index 54844286..7821fbfa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,4 +15,4 @@ pymdown-extensions==3.5
 pyparsing==2.1.10
 PyYAML==3.12
 six==1.10.0
-tornado==4.5.1
+tornado==5.1