diff --git a/package.json b/package.json
index 18d6ab3571c..ba66a784d04 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "event-stream": "^3.3.1",
     "express": "^4.12.3",
     "express-ab": "^0.7.0",
-    "gulp": "^3.8.8",
+    "gulp": "^4.0.0",
     "gulp-autoprefixer": "1.0.0",
     "gulp-cache": "^0.4.1",
     "gulp-cache-bust": "perrygovier/gulp-cache-bust",
@@ -42,12 +42,12 @@
     "gulp-footer": "^1.0.5",
     "gulp-header": "^1.7.1",
     "gulp-if": "^1.2.1",
-    "gulp-imagemin": "^2.0.0",
-    "gulp-livereload": "^1.2.0",
+    "gulp-imagemin": "^3.0.0",
+    "gulp-livereload": "^2.1.1",
     "gulp-load-plugins": "^0.8.0",
     "gulp-minify-css": "^0.3.0",
     "gulp-rename": "^1.2.0",
-    "gulp-sass": "^2.3.1",
+    "gulp-sass": "^5.0.0",
     "gulp-shell": "0.5.1",
     "gulp-size": "^1.0.0",
     "gulp-sourcemaps": "^1.3.0",
@@ -58,7 +58,7 @@
     "js-yaml": "^3.4.2",
     "lunr": "^0.5.12",
     "mkdirp": "^0.5.1",
-    "psi": "^1.0.4",
+    "psi": "^4.1.0",
     "run-sequence": "^1.2.2",
     "tiny-lr": "0.0.5"
   }