diff --git a/package.json b/package.json
index e1a9bc0..1778dbd 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
     "memoizesync": "^1.1.1",
     "messy": "^7.0.0",
     "mitm": "^1.7.1",
-    "underscore": "^1.8.3",
+    "underscore": "1.13.7",
     "unexpected-messy": "^11.0.1"
   },
   "nyc": {