diff --git a/package-lock.json b/package-lock.json
index a0447bf..e5509c1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,7 +6,7 @@
     "": {
       "name": "ol3-map-widget",
       "devDependencies": {
-        "grunt": "^1.0.4",
+        "grunt": "^1.5.2",
         "grunt-contrib-clean": "~1.1.0",
         "grunt-contrib-compress": "^2.0.0",
         "grunt-contrib-copy": "^1.0.0",
@@ -2536,9 +2536,9 @@
       "dev": true
     },
     "node_modules/grunt": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.4.1.tgz",
-      "integrity": "sha512-ZXIYXTsAVrA7sM+jZxjQdrBOAg7DyMUplOMhTaspMRExei+fD0BTwdWXnn0W5SXqhb/Q/nlkzXclSi3IH55PIA==",
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.2.tgz",
+      "integrity": "sha512-XCtfaIu72OyDqK24MjWiGC9SwlkuhkS1mrULr1xzuJ2XqAFhP3ZAchZGHJeSCY6mkaOXU4F7SbmmCF7xIVoC9w==",
       "dev": true,
       "dependencies": {
         "dateformat": "~3.0.3",
@@ -2546,7 +2546,7 @@
         "exit": "~0.1.2",
         "findup-sync": "~0.3.0",
         "glob": "~7.1.6",
-        "grunt-cli": "~1.4.2",
+        "grunt-cli": "~1.4.3",
         "grunt-known-options": "~2.0.0",
         "grunt-legacy-log": "~3.0.0",
         "grunt-legacy-util": "~2.0.1",
@@ -8486,9 +8486,9 @@
       "dev": true
     },
     "grunt": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.4.1.tgz",
-      "integrity": "sha512-ZXIYXTsAVrA7sM+jZxjQdrBOAg7DyMUplOMhTaspMRExei+fD0BTwdWXnn0W5SXqhb/Q/nlkzXclSi3IH55PIA==",
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.2.tgz",
+      "integrity": "sha512-XCtfaIu72OyDqK24MjWiGC9SwlkuhkS1mrULr1xzuJ2XqAFhP3ZAchZGHJeSCY6mkaOXU4F7SbmmCF7xIVoC9w==",
       "dev": true,
       "requires": {
         "dateformat": "~3.0.3",
@@ -8496,7 +8496,7 @@
         "exit": "~0.1.2",
         "findup-sync": "~0.3.0",
         "glob": "~7.1.6",
-        "grunt-cli": "~1.4.2",
+        "grunt-cli": "~1.4.3",
         "grunt-known-options": "~2.0.0",
         "grunt-legacy-log": "~3.0.0",
         "grunt-legacy-util": "~2.0.1",
diff --git a/package.json b/package.json
index ee2df52..febde42 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "description": "This package.json file is only used for installing npm dependencies. But this is not an installable node package, but a WireCloud widget. Take a look into src/config.xml for more details about this widget",
   "devDependencies": {
-    "grunt": "^1.0.4",
+    "grunt": "^1.5.2",
     "grunt-contrib-clean": "~1.1.0",
     "grunt-contrib-compress": "^2.0.0",
     "grunt-contrib-copy": "^1.0.0",