diff --git a/src/wp-content/themes/twentynineteen/package.json b/src/wp-content/themes/twentynineteen/package.json
index d6921082d3751..92d14e47544de 100644
--- a/src/wp-content/themes/twentynineteen/package.json
+++ b/src/wp-content/themes/twentynineteen/package.json
@@ -16,7 +16,7 @@
     "chokidar-cli": "^3.0.0",
     "node-sass": "^9.0.0",
     "npm-run-all": "^4.1.5",
-    "postcss": "^8.4.38",
+    "postcss": "^8.5.0",
     "postcss-cli": "^11.0.0",
     "postcss-focus-within": "^8.0.1",
     "rtlcss": "^4.1.1"