diff --git a/requirements.txt b/requirements.txt
index 929afc5..3b409f0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,4 +18,4 @@ rdflib-jsonld==0.3
 requests==2.3.0
 six==1.7.2
 SPARQLWrapper==1.6.0
-Werkzeug==0.9.6
+Werkzeug==0.15.5