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This release is a hotfix for relay#5913 where Relay versions 26.4.0 and 26.4.1 fail to authenticate with Sentry upstream, encountering HTTP/2 stream errors. The relay continuously retries but gets: http2 error, stream error received: unspecific protocol error detected. This completely blocks event forwarding. What happened is Relay was unconditionally setting the Host header in HTTP/2 requests, violating protocol specs; the fix makes it conditional, only set if explicitly configured, so HTTP/2 can manage it automatically.

No configuration changes needed.

On the next release (26.5.0), we will be shipping Launchpad that powers Mobile Build Distribution & Size Analysis.


Questions or want to talk through your setup? Find us on Sentry's Discord — always happy to chat.

New Features ✨

  • Allow upgrade tests by @aldy505 in #4288

Bug Fixes 🐛

  • Force disable HTTP(S) proxy for seaweedfs services by @DragoonAethis in #4311

Internal Changes 🔧

Deps

  • Bump j178/prek-action from 2.0.1 to 2.0.2 by @dependabot in #4289
  • Bump actions/setup-node from 6.3.0 to 6.4.0 by @dependabot in #4291
  • Bump actions/create-github-app-token from 3.0.0 to 3.1.1 by @dependabot in #4280
  • Bump pygments from 2.19.2 to 2.20.0 by @dependabot in #4256

Deps Dev

  • Bump pytest from 9.0.1 to 9.0.3 by @dependabot in #4284
  • Bump cryptography from 46.0.5 to 46.0.7 by @dependabot in #4275

Other

  • (relay) Remove healthcheck from docker compose by @Dav1dde in #4304
  • (template) Remove task for updating relocation release tests by @kenzoengineer in #4297
Source: README.md, updated 2026-05-05