diff --git a/package-lock.json b/package-lock.json
index 73c021e..09ce8a5 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -164,12 +172,24 @@
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+      "optional": true,
       "requires": {
         "duplexify": "3.6.0",
         "glob-stream": "5.3.5",
@@ -4595,6 +5499,7 @@
           "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.3.tgz",
           "integrity": "sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=",
           "dev": true,
+          "optional": true,
           "requires": {
             "readable-stream": "2.3.6",
             "xtend": "4.0.1"
@@ -4613,6 +5518,7 @@
       "resolved": "https://registry.npmjs.org/ware/-/ware-1.3.0.tgz",
       "integrity": "sha1-0bFPOdLiy0q4xAmPdW/ksWTkc9Q=",
       "dev": true,
+      "optional": true,
       "requires": {
         "wrap-fn": "0.1.5"
       }
@@ -4645,6 +5551,7 @@
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
       "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
       "dev": true,
+      "optional": true,
       "requires": {
         "string-width": "1.0.2"
       }
@@ -4654,6 +5561,7 @@
       "resolved": "https://registry.npmjs.org/wrap-fn/-/wrap-fn-0.1.5.tgz",
       "integrity": "sha1-8htuQQFv9KfjFyDbxjoJAWvfmEU=",
       "dev": true,
+      "optional": true,
       "requires": {
         "co": "3.1.0"
       },
@@ -4662,7 +5570,8 @@
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/co/-/co-3.1.0.tgz",
           "integrity": "sha1-TqVOpaCJOBUxheFSEMaNkJK8G3g=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -4690,6 +5599,7 @@
       "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.9.2.tgz",
       "integrity": "sha1-T7G8euH8L1cDe1SvasyP4QMcW3c=",
       "dev": true,
+      "optional": true,
       "requires": {
         "buffer-crc32": "0.2.13",
         "fd-slicer": "1.1.0"
diff --git a/package.json b/package.json
index c29a2f1..a25a9a5 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "license": "GPL v3",
   "repository": "https://github.com/puikinsh/sparkling",
   "devDependencies": {
-    "grunt": "^1.0.2",
+    "grunt": "^1.5.3",
     "grunt-checktextdomain": "^1.0.1",
     "grunt-cli": "^1.2.0",
     "grunt-contrib-clean": "^1.1.0",