Mac OS 13 is unsupported by Apple as of Nov 2025. If that's the most recent OS you are able to install that also means your H/W is also outdated and can't handle MAC OS 14 or above so it's stopped on 13. You'll not get any more updates from Apple, and 3rd party apps will stop giving you updates also e.g. Microsoft 365, Adobe, and Intuit - Turbotax 2025 desktop is only supported on MAC OS 14 or above.
See
https://turbotax.intuit.com/personal-taxes/cd-download/tta-system-requirements/
https://ttlc.intuit.com/turbotax-support/en-us/help-article/download-products/end-support-mojave-10-...
