diff --git a/requirements.txt b/requirements.txt
index c3bb005..0f9c8be 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # De opgeven versie is optioneel
 Flask==1.0.2
 Jinja2==2.10.1
-Werkzeug==0.15.2
+Werkzeug==0.15.3
 mysql-connector==2.2.9
 mysql-connector-python==8.0.11
 biopython==1.73