# 426 Upgrade Required

> HTTP response status code

**Wikidata**: [Q64728497](https://www.wikidata.org/wiki/Q64728497)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HTTP_426)  
**Source**: https://4ort.xyz/entity/426-upgrade-required


## References

1. RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content