diff --git a/deps.json b/deps.json
index caed4552e..42eebfd8d 100644
--- a/deps.json
+++ b/deps.json
@@ -34,6 +34,11 @@
         "version": "d781998583680cda80cf61e0b37dd0cd8da2eb52",
         "type": "git"
     },
+    "otto": {
+        "repo": "github.com/robertkrimen/otto",
+        "version": "f9e07770bd9b5142de517b05a85ffbb42d1895da",
+        "type": "git"
+    },
     "rbtree": {
         "repo": "github.com/yasushi-saito/rbtree",
         "version": "571e2538414bf914c7e2909b61217b4e3e5508f4",