diff --git a/package.json b/package.json
index c6cd023d..85a2c4b2 100644
--- a/package.json
+++ b/package.json
@@ -23,13 +23,13 @@
     "gulp-cssnano": "^2.1.3",
     "gulp-html-prettify": "0.0.1",
     "gulp-npm-dist": "^1.0.1",
-    "gulp-postcss": "^7.0.1",
+    "gulp-postcss": "^9.0.0",
     "gulp-rename": "^1.2.2",
     "gulp-run": "^1.7.1",
     "gulp-uglify": "^3.0.0",
     "gulp-useref-plus": "0.0.8",
     "gulp-wait": "0.0.2",
-    "postcss-flexbugs-fixes": "^3.3.1",
+    "postcss-flexbugs-fixes": "^5.0.0",
     "pump": "^3.0.0",
     "run-sequence": "^2.2.1"
   },