diff --git a/nnfee/estimator/requirements.txt b/nnfee/estimator/requirements.txt
index 77155af..76ea169 100644
--- a/nnfee/estimator/requirements.txt
+++ b/nnfee/estimator/requirements.txt
@@ -19,4 +19,4 @@ six==1.11.0
 tensorboard==1.6.0
 tensorflow==1.6.0
 termcolor==1.1.0
-Werkzeug==0.14.1
+Werkzeug==0.15.3