diff --git a/package-lock.json b/package-lock.json
index deb0e19..619b368 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,9 +41,9 @@
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@@ -269,6 +371,41 @@
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+      "integrity": "sha512-wpav5XYiddjXxirPoCTUPbqM0PXvJ9hiBMvuJgInvo4/lAOTZzUprArw17q2O1P2+GHhbBr18/iQwjL5Z9BqfA==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^3.0.0",
+        "object.assign": "^4.1.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+          "integrity": "sha512-4nhGqUkc4BqbBBB4Q6zLuD7lzzrHYrjKGeYaEji/3tFR5VdJu9v+LilhGIVe8wxEJPPOeWo7eg8dwY13TZ1BNg==",
+          "dev": true
+        }
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 88d5328..90f6486 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "docpad-plugin-marked": "^2.5.0",
     "docpad-plugin-menu": "^3.0.0",
     "docpad-plugin-partials": "^2.13.0",
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.2",
     "gulp-gzip": "^1.4.2",
     "gulp-minify-css": "^1.2.4",
     "html-transform": "git+https://github.com/sergeche/html-transform.git#v3.0.0",