diff --git a/package-lock.json b/package-lock.json
index 9558979..9bc0950 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -2446,15 +2439,6 @@
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@@ -2759,38 +2743,6 @@
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-            "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
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-            "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
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@@ -2869,24 +2821,6 @@
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-            "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
-            "dev": true,
-            "requires": {
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-            "integrity": "sha1-DHlipq3vp7vUrDZkYKY4VSrhoKI=",
-            "dev": true,
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         "strip-json-comments": {
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@@ -2902,6 +2836,12 @@
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             }
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+        "supports-preserve-symlinks-flag": {
+            "version": "1.0.0",
+            "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
+            "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
+            "dev": true
+        },
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@@ -3004,12 +2944,6 @@
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-            "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
-            "dev": true
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@@ -3032,12 +2966,12 @@
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-            "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.5.tgz",
-            "integrity": "sha512-g+dpmgn+XBneLmXXo+sGlW5xQEt4ErkS3mgeN2GFbremYeMBSJKr9Wf2KJplQVaiPY/f7FN6atosWYNm9ovrYg==",
+            "version": "3.3.6",
+            "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.6.tgz",
+            "integrity": "sha512-VoC83HWXmCrF6rgkyxS9GHv8W9Q5nhMKho+OadDJGzL2oDYbYEppBaCMH6pFlwLeqj2QS+hhkw2kpXkSdD1JxQ==",
             "dev": true,
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-                "sprintf-js": "^1.0.3",
+                "sprintf-js": "^1.1.1",
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@@ -3129,16 +3063,6 @@
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-            "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
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-            "requires": {
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diff --git a/package.json b/package.json
index 525d048..f4a4fb2 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
         "slideshow": "./slideshow-cli.js"
     },
     "devDependencies": {
-        "grunt": "1.0.4",
+        "grunt": "1.5.3",
         "grunt-cli": "1.3.2",
         "grunt-contrib-jshint": "2.1.0",
         "grunt-contrib-clean": "2.0.0",