diff --git a/requirements.txt b/requirements.txt
index c5980f3..e6b3bf9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-attrs==19.3.0
+attrs==19.3.0
 backcall==0.1.0
 bleach==3.3.0
 colorama==0.4.1
@@ -55,7 +55,7 @@ statsmodels==0.10.1
 terminado==0.8.2
 testpath==0.4.2
 text-unidecode==1.3
-tornado==6.0.3
+tornado==6.3.3
 traitlets==4.3.3
 wcwidth==0.1.7
 webencodings==0.5.1