diff --git a/TextToSpeech/requirements.txt b/TextToSpeech/requirements.txt
index fee803a..e780622 100644
--- a/TextToSpeech/requirements.txt
+++ b/TextToSpeech/requirements.txt
@@ -107,7 +107,7 @@ tornado==4.5.2
 traitlets==4.3.2
 unicodecsv==0.14.1
 wcwidth==0.1.7
-Werkzeug==0.12.2
+Werkzeug==0.15.5
 widgetsnbextension==3.0.2
 wrapt==1.10.11
 xacro==1.11.3