diff --git a/requirements.txt b/requirements.txt
index 6168add2358..92cfbcf892a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ jupyter==1.0.0
 
 coverage==4.1
 nose==1.3.7
-tornado==4.0.2
+tornado
 flake8==2.5.2
 tqdm
 networkx==2.1