https://github.com/denoland/setup-deno/blob/5e01c016a857a4dbb5afe9d0f9733cd472cba985/src/version.mjs#L2C10-L2C15 This fetch call fails behind proxy. Please consider to use proxied fetch from [@actions/toolkit http client](https://github.com/actions/toolkit/blob/d14afd7973c037fa9f72882decd1eb3befa36135/packages/http-client/src/index.ts#L127 ) or [proxy-agent](https://www.npmjs.com/package/proxy-agent).