diff --git a/fixtures/mercurial/requirements.txt b/fixtures/mercurial/requirements.txt
index 8e7cdcf15..3a921c61f 100644
--- a/fixtures/mercurial/requirements.txt
+++ b/fixtures/mercurial/requirements.txt
@@ -1,7 +1,7 @@
 Flask==0.10.1
 Jinja2==2.7.2
 MarkupSafe==0.21
-Werkzeug==0.10.4
+Werkzeug==0.15.3
 gunicorn==19.3.0
 itsdangerous==0.24
 pylibmc==1.4.2