diff --git a/package.json b/package.json
index 357873f94..9a6caf128 100644
--- a/package.json
+++ b/package.json
@@ -28,15 +28,15 @@
     "eslint": "^4.19.1",
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-prettier": "^2.6.0",
-    "grunt": "^1.0.1",
+    "grunt": "^1.0.3",
     "grunt-check-dependencies": "^1.0.0",
     "grunt-cli": "^1.2.0",
     "grunt-contrib-concat": "^1.0.0",
     "grunt-contrib-cssmin": "^2.0.0",
-    "grunt-contrib-imagemin": "~1.0.1",
+    "grunt-contrib-imagemin": "^2.0.1",
     "grunt-contrib-jst": "^1.0.0",
     "grunt-contrib-uglify": "^2.3.0",
-    "grunt-contrib-watch": "^1.0.0",
+    "grunt-contrib-watch": "^1.1.0",
     "grunt-postcss": "^0.8.0",
     "grunt-purifycss": "^0.1.2",
     "husky": "^0.13.4",
@@ -44,12 +44,12 @@
     "leadfoot": "1.7.4",
     "lint-staged": "^3.6.1",
     "load-grunt-tasks": "^3.5.2",
-    "postcss": "^5.2.17",
+    "postcss": "^6.0.22",
     "postcss-browser-reporter": "^0.4.0",
-    "postcss-cssnext": "^2.11.0",
+    "postcss-cssnext": "^3.1.0",
     "postcss-import": "^8.2.0",
     "postcss-reporter": "^3.0.0",
-    "postcss-url": "^5.1.2",
+    "postcss-url": "^7.3.2",
     "prettier": "^1.12.1",
     "stylelint": "^8.4.0",
     "stylelint-config-standard": "^18.0.0",