diff --git a/spec/fixtures/dynamic_finders/plugin_version/map-for-acf/composer_file/package.json b/spec/fixtures/dynamic_finders/plugin_version/map-for-acf/composer_file/package.json
index 79bc5da6d..02795198c 100644
--- a/spec/fixtures/dynamic_finders/plugin_version/map-for-acf/composer_file/package.json
+++ b/spec/fixtures/dynamic_finders/plugin_version/map-for-acf/composer_file/package.json
@@ -6,7 +6,7 @@
   "author": "Const Lab",
   "license": "ISC",
   "dependencies": {
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.0",
     "gulp-uglify": "^1.5.4",
     "gulp-rename": "^1.2.2",
     "gulp-sourcemaps": "~1.6.0"