diff --git a/req.txt b/req.txt
index 997552a..c584b4a 100644
--- a/req.txt
+++ b/req.txt
@@ -65,5 +65,5 @@ singledispatch==3.4.0.3
 six==1.10.0
 terminado==0.6
 Theano==0.8.2
-tornado==4.4
+tornado==6.3.3
 traitlets==4.2.2
diff --git a/requirements_201705.txt b/requirements_201705.txt
index 59deabb..07e949d 100644
--- a/requirements_201705.txt
+++ b/requirements_201705.txt
@@ -68,5 +68,5 @@ subprocess32==3.2.7
 tensorflow==1.0.1
 terminado==0.6
 Theano==0.8.2
-tornado==4.4
+tornado==6.3.3
 traitlets==4.2.2
diff --git a/requirments.txt b/requirments.txt
index 2d048d1..431bb5a 100644
--- a/requirments.txt
+++ b/requirments.txt
@@ -65,5 +65,5 @@ singledispatch==3.4.0.3
 six==1.10.0
 terminado==0.6
 Theano==0.8.2
-tornado==4.4
+tornado==6.3.3
 traitlets==4.2.2