The upstream package has moved maintenance to github.com/golang-jwt/jwt: See this issue: dgrijalva/jwt-go#462
PR: #10
If you're still using github.com/dgrijalva/jwt-go, then please upgrade this project by changing JWKs.KeyFunc to JWKs.KeyFuncLegacy.
Additionally, if you didn't see the changed from v0.5.0, rate limiting is now possible. Make sure to use that if you're refreshing on an unknown kid.