diff --git a/package.json b/package.json
index 366934fd..8ebb38e2 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   },
   "devDependencies": {
     "mocha": "^3.5.0",
-    "should": "^12.0.0"
+    "should": "^13.0.0"
   },
   "scripts": {
     "update": "bash update_proto.sh",