diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4b46e43..02b9e5f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 * Supply `webpack` `^5.103` to provide `webpack.ManifestPlugin` for STRWEB-144. Refs STCLI-275.
 * Expose the `--federate` flag on `build` and `serve` command. Refs STRIPES-861.
 * Build static federated ui-bundles, host app. Refs STRIPES-861.
+* Upgrade fast-xml-parser from 4 (EOL) to 5.5.8. Refs STCLI-278.
 
 ## [4.0.0](https://github.com/folio-org/stripes-cli/tree/v4.0.0) (2025-02-24)
 [Full Changelog](https://github.com/folio-org/stripes-cli/compare/v3.2.0...v4.0.0)
diff --git a/package.json b/package.json
index 51bf659..21d92bf 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "debug": "^4.0.1",
     "express": "^4.17.1",
     "fast-glob": "^3.3.1",
-    "fast-xml-parser": "^4.2.4",
+    "fast-xml-parser": "^5.5.8",
     "find-up": "^2.1.0",
     "fs-extra": "^11.1.1",
     "get-stdin": "^6.0.0",