diff --git a/requirements.txt b/requirements.txt
index f686d1b0..b51095f6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,3 +20,4 @@ Sphinx==2.0.1
 SQLAlchemy==1.3.0b2
 sqlalchemy-stubs==0.1
 SQLAlchemy-Utils==0.33.11
+Werkzeug==0.16.1