v1.91.1

BerriAI/litellmv1.91.1Jul 8, 2026by github-actions[bot]

AI Summary

This patch release introduces cryptographic signing for Docker images using Cosign and includes backports of three pull requests to the stable 1.91.x branch.

Key Highlights

All LiteLLM Docker images are now signed with Cosign for enhanced security and integrity.
Provides instructions to verify images using a pinned commit hash or the release tag.
Includes backports of PRs #32256, #32405, and #32524 to the stable branch.

New Features

Docker image signature verification with Cosign
Backport of PR #32256
Backport of PR #32405
Backport of PR #32524

Full Release Notes

## Verify Docker Image Signature

All LiteLLM Docker images are signed with [cosign](https://docs.sigstore.dev/cosign/overview/). Every release is signed with the same key introduced in [commit `0112e53`](https://github.com/BerriAI/litellm/commit/0112e53046018d726492c814b3644b7d376029d0).

**Verify using the pinned commit hash (recommended):**

A commit hash is cryptographically immutable, so this is the strongest way to ensure you are using the original signing key:

```bash
cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/0112e53046018d726492c814b3644b7d376029d0/cosign.pub \
  ghcr.io/berriai/litellm:v1.91.1
```

**Verify using the release tag (convenience):**

Tags are protected in this repository and resolve to the same key. This option is easier to read but relies on tag protection rules:

```bash
cosign verify \
  --key https://raw.githubusercontent.com/BerriAI/litellm/v1.91.1/cosign.pub \
  ghcr.io/berriai/litellm:v1.91.1
```

Expected output:

```
The following checks were performed on each of these signatures:
  - The cosign claims were validated
  - The signatures were verified against the specified public key
```

---
## What's Changed
* chore(release): backport #32256, #32405, #32524 to stable/1.91.x and cut 1.91.1 by @yuneng-berri in https://github.com/BerriAI/litellm/pull/32552


**Full Changelog**: https://github.com/BerriAI/litellm/compare/v1.91.0...v1.91.1