diff --git a/package-lock.json b/package-lock.json
index 6868c3e..a6c362f 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -209,6 +336,12 @@
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@@ -371,6 +543,12 @@
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+        "convert-source-map": "^1.5.0",
+        "graceful-fs": "^4.1.6",
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@@ -2718,7 +2844,7 @@
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diff --git a/package.json b/package.json
index 33cfc4d..779a453 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
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   "homepage": "https://github.com/seagatesoft/webdext#readme",
   "devDependencies": {
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.2",
     "gulp-concat": "^2.6.1"
   },
   "dependencies": {