diff --git a/gulpfile.js b/gulpfile.js
index 70a838f504..fd82ad3ab4 100755
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -16,20 +16,10 @@ gulp.task('jekyll-build', function (done) {
 });
 
 // Rebuild Jekyll and page reload
-gulp.task('jekyll-rebuild', ['jekyll-build'], function () {
+gulp.task('jekyll-rebuild', function () {
     browserSync.reload();
 });
 
-// Wait for jekyll-build, then launch the Server
-gulp.task('browser-sync', ['sass', 'img', 'jekyll-build'], function() {
-    browserSync({
-        server: {
-            baseDir: '_site'
-        },
-        notify: false
-    });
-});
-
 // Compile files
 gulp.task('sass', function () {
     return gulp.src('assets/css/scss/main.scss')
@@ -56,13 +46,23 @@ gulp.task('img', function() {
     .pipe(browserSync.reload({stream:true}));
 });
 
+// Wait for jekyll-build, then launch the Server
+gulp.task('browser-sync', gulp.series('sass', 'img', 'jekyll-build'), function() {
+    browserSync({
+        server: {
+            baseDir: '_site'
+        },
+        notify: false
+    });
+});
+
 // Watch scss, html, img files
 gulp.task('watch', function () {
-    gulp.watch('assets/css/scss/**/*.scss', ['sass']);
-    gulp.watch('assets/js/**/*.js', ['jekyll-rebuild']);
-    gulp.watch('assets/img/**/*', ['img']);
-    gulp.watch(['*.html', '_layouts/*.html', '_includes/*.html', '_pages/*.html', '_posts/*'], ['jekyll-rebuild']);
+    gulp.watch('assets/css/scss/**/*.scss', gulp.series('sass'));
+    gulp.watch('assets/js/**/*.js', gulp.series('jekyll-rebuild'));
+    gulp.watch('assets/img/**/*', gulp.series('img'));
+    gulp.watch(['*.html', '_layouts/*.html', '_includes/*.html', '_pages/*.html', '_posts/*'], gulp.series('jekyll-rebuild'));
 });
 
 //  Default task
-gulp.task('default', ['browser-sync', 'watch']);
+gulp.task('default', gulp.series('browser-sync', 'watch'));
diff --git a/package.json b/package.json
index d70921d143..72a8eab257 100644
--- a/package.json
+++ b/package.json
@@ -9,11 +9,11 @@
   "dependencies": {
     "browser-sync": "^2.18.13",
     "child_process": "^1.0.2",
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.2",
     "gulp-autoprefixer": "^4.0.0",
     "gulp-cache": "^0.4.6",
-    "gulp-imagemin": "^3.2.0",
+    "gulp-imagemin": "^7.1.0",
     "gulp-sass": "^3.1.0",
-    "imagemin-pngquant": "^5.0.0"
+    "imagemin-pngquant": "^9.0.2"
   }
 }