diff --git a/debian/control b/debian/control
index 176587d..eaa0994 100644
--- a/debian/control
+++ b/debian/control
@@ -50,6 +50,7 @@ Depends: adduser,
          ruby-dalli,
          ruby-delayed-job,
          ruby-delayed-job-active-record,
+         ruby-diffy,
          ruby-eita-jrails (>= 0.9.3-5~),
          ruby-eventmachine (>= 0.12.10-4~),
          ruby-exception-notification,
--
libgit2 0.21.2