diff --git a/package-lock.json b/package-lock.json
index 31c81b3..12f290e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -875,9 +875,9 @@
       "dev": true
     },
     "diff": {
-      "version": "1.3.2",
-      "resolved": "https://registry.npmjs.org/diff/-/diff-1.3.2.tgz",
-      "integrity": "sha1-/Qeh8fiRUZ2ZBaTJqJ3PWnC2YDc=",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.2.tgz",
+      "integrity": "sha512-58lmxKSA4BNyLz+HHMUzlOEpg09FV+ev6ZMe3vJihgdxzgcwZ8VoEEPmALCZG9LmqfVoNMMKpttIYTVG6uDY7A==",
       "dev": true
     },
     "duplexer": {
@@ -1571,6 +1571,12 @@
             "supports-color": "^1.3.0"
           }
         },
+        "diff": {
+          "version": "1.3.2",
+          "resolved": "https://registry.npmjs.org/diff/-/diff-1.3.2.tgz",
+          "integrity": "sha1-/Qeh8fiRUZ2ZBaTJqJ3PWnC2YDc=",
+          "dev": true
+        },
         "supports-color": {
           "version": "1.3.1",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-1.3.1.tgz",
diff --git a/package.json b/package.json
index 0cfa4d9..ac0be65 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
   "license": "MIT",
   "devDependencies": {
     "caniuse-db": "^1.0.30001119",
+    "diff": ">=3.5.0",
     "grunt": "^1.3.0",
     "grunt-autoprefixer": "^3.0.*",
     "grunt-browser-sync": "^2.2.*",