diff --git a/requirements.txt b/requirements.txt
index 7d9d8aa..34ba7eb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@ requests==2.20.0
 suds-jurko==0.6
 vatnumber==1.2
 vobject==0.9.3
-Werkzeug==0.11.15
+Werkzeug==0.15.3
 XlsxWriter==0.9.3
 xlwt==1.3.*
 xlrd==1.0.0