diff --git a/canvas_modules/harness/package.json b/canvas_modules/harness/package.json
index 9bfa949141..c3f09b117c 100644
--- a/canvas_modules/harness/package.json
+++ b/canvas_modules/harness/package.json
@@ -68,7 +68,7 @@
     "mini-css-extract-plugin": "0.11.2",
     "object-assign": "4.1.1",
     "path": "0.12.7",
-    "postcss": "8.3.6",
+    "postcss": "8.4.31",
     "postcss-loader": "4.3.0",
     "prop-types": "15.7.2",
     "react": "18.2.0",