diff --git a/tox.ini b/tox.ini
index 711787f0b5b12ccd4ef207cd9822117893720439_dG94LmluaQ==..155a20154f844efa5436f26b5b092c9ee17027e1_dG94LmluaQ== 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,6 +9,7 @@
 deps =
   pytest
   cubicweb-blog
+  mock
 commands =
   {envpython} -m pytest {posargs:test}