diff --git a/browser/package-lock.json b/browser/package-lock.json
index 90f1aa3..9bd7476 100644
--- a/browser/package-lock.json
+++ b/browser/package-lock.json
@@ -195,6 +195,15 @@
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@@ -236,10 +245,19 @@
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-      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
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@@ -256,12 +274,30 @@
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+      "resolved": "https://registry.npmjs.org/arr-map/-/arr-map-2.0.2.tgz",
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@@ -277,7 +313,7 @@
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@@ -286,6 +322,41 @@
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+      "resolved": "https://registry.npmjs.org/array-sort/-/array-sort-1.0.0.tgz",
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@@ -399,6 +489,18 @@
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+        "once": "^1.3.2",
+        "process-nextick-args": "^2.0.0",
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+        "arr-flatten": "^1.0.1",
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@@ -1036,6 +1165,12 @@
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+      "resolved": "https://registry.npmjs.org/clone-buffer/-/clone-buffer-1.0.0.tgz",
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+      "resolved": "https://registry.npmjs.org/cloneable-readable/-/cloneable-readable-1.1.3.tgz",
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@@ -1476,6 +1640,24 @@
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       "dev": true,
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-        "clone": "^1.0.2"
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+      "resolved": "https://registry.npmjs.org/default-resolution/-/default-resolution-2.0.0.tgz",
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@@ -1854,6 +2045,28 @@
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-      "integrity": "sha1-jhdyBsPICDfYVjLouTWd/osvbq8=",
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+          "dev": true
+        },
+        "convert-source-map": {
+          "version": "1.9.0",
+          "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.9.0.tgz",
+          "integrity": "sha512-ASFBup0Mz1uyiIjANan1jzLQami9z1PoYSZCiiYW2FczPbenXc45FZdBZLzOT+r6+iciuEModtmCti+hjaAk0A==",
+          "dev": true
+        },
+        "replace-ext": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-1.0.1.tgz",
+          "integrity": "sha512-yD5BHCe7quCgBph4rMQ+0KkIRKwWCrHDOX1p1Gp6HwjPM5kVoCdKGNhN7ydqqsX6lJEnQDKZ/tFMiEdQ1dvPEw==",
+          "dev": true
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+        "vinyl": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-2.2.1.tgz",
+          "integrity": "sha512-LII3bXRFBZLlezoG5FfZVcXflZgWP/4dCwKtxd5ky9+LOtM4CS3bIRQsmR1KMnMW07jpE8fqR2lcxPZ+8sJIcw==",
+          "dev": true,
+          "requires": {
+            "clone": "^2.1.1",
+            "clone-buffer": "^1.0.0",
+            "clone-stats": "^1.0.0",
+            "cloneable-readable": "^1.0.0",
+            "remove-trailing-separator": "^1.0.1",
+            "replace-ext": "^1.0.0"
+          }
+        }
+      }
+    },
     "vinyl-sourcemaps-apply": {
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diff --git a/browser/package.json b/browser/package.json
index 74f3689..49f5673 100644
--- a/browser/package.json
+++ b/browser/package.json
@@ -20,7 +20,7 @@
   "devDependencies": {
     "browser-sync": "^2.26.5",
     "browserify": "^14.0.0",
-    "gulp": "^3.8.10",
+    "gulp": "^4.0.2",
     "gulp-autoprefixer": "^3.1.1",
     "gulp-less": "3.3.0",
     "gulp-notify": "^2.1.0",