diff --git a/package-lock.json b/package-lock.json
index 904d236..755d824 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
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@@ -3068,9 +3068,9 @@
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+      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.4.1.tgz",
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@@ -3079,7 +3079,7 @@
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         "grunt-cli": "~1.4.2",
-        "grunt-known-options": "~1.1.1",
+        "grunt-known-options": "~2.0.0",
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@@ -3241,6 +3241,15 @@
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+    "node_modules/grunt/node_modules/grunt-known-options": {
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+      "resolved": "https://registry.npmjs.org/grunt-known-options/-/grunt-known-options-2.0.0.tgz",
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+      "dev": true,
+      "engines": {
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     "node_modules/handlebars": {
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       "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-2.0.0.tgz",
@@ -9459,9 +9468,9 @@
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-      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.4.0.tgz",
-      "integrity": "sha512-yRFc0GVCDu9yxqOFzpuXQ2pEdgtLDnFv5Qz54jfIcNnpJ8Z7B7P7kPkT4VMuRvm+N+QOsI8C4v/Q0DSaoj3LgQ==",
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.4.1.tgz",
+      "integrity": "sha512-ZXIYXTsAVrA7sM+jZxjQdrBOAg7DyMUplOMhTaspMRExei+fD0BTwdWXnn0W5SXqhb/Q/nlkzXclSi3IH55PIA==",
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@@ -9470,7 +9479,7 @@
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         "grunt-cli": "~1.4.2",
-        "grunt-known-options": "~1.1.1",
+        "grunt-known-options": "~2.0.0",
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@@ -9479,6 +9488,14 @@
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         "nopt": "~3.0.6",
         "rimraf": "~3.0.2"
+      },
+      "dependencies": {
+        "grunt-known-options": {
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+          "resolved": "https://registry.npmjs.org/grunt-known-options/-/grunt-known-options-2.0.0.tgz",
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+          "dev": true
+        }
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     },
     "grunt-cli": {
diff --git a/package.json b/package.json
index bd9127b..a1f03ee 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   },
   "homepage": "http://floydpink.github.io/lzwCompress.js/",
   "devDependencies": {
-    "grunt": "^1.4.0",
+    "grunt": "^1.4.1",
     "grunt-contrib-jshint": "^3.0.0",
     "grunt-contrib-watch": "^1.1.0",
     "grunt-karma": "^4.0.2",