--- /dev/null
+# Migrating from WSC 5.4 - Third Party Libraries
+
+## scssphp
+
+scssphp was updated from version 1.4 to 1.6.
+
+If you interact with scssphp only by deploying `.scss` files, then you should not experience any breaking changes, except when the improved SCSS compatibility interprets your SCSS code differently.
+
+If you happen to directly use scssphp in your PHP code, you should be aware that scssphp deprecated the use of the `compile()` method, non-UTF-8 processing and also adjusted the handling of pure PHP values for variable handling.
+
+Refer to [WoltLab/WCF#4345](https://github.com/WoltLab/WCF/pull/4345) and the [scssphp releases](https://github.com/scssphp/scssphp/releases) for details.
- 'Migrating from WSC 5.4':
- 'PHP API': 'migration/wsc54/php.md'
- 'TypeScript and JavaScript': 'migration/wsc54/javascript.md'
+ - 'Third Party Libraries': 'migration/wsc54/libraries.md'
- 'Deprecations and Removals': 'migration/wsc54/deprecations_removals.md'
- 'Migrating from WSC 5.3':
- 'PHP API': 'migration/wsc53/php.md'