diff --git a/requirements.txt b/requirements.txt
index c6a13798..a414803e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -95,7 +95,7 @@ sphinxcontrib-serializinghtml==1.1.3
 stevedore==1.31.0
 terminado==0.8.3
 testpath==0.4.4
-tornado==6.0.3
+tornado==6.3.2
 tqdm==4.36.1
 traitlets==4.3.2
 twine==1.15.0