# Release History

## 4.2.1 (2024-01-16)

### Bugs Fixed

- [[#4754]](https://github.com/Azure/azure-sdk-for-cpp/issues/4754) Thread safety for authentication policy.

## 4.2.0 (2023-05-09)

### Features Added

- Added support for challenge-based and multi-tenant authentication.

## 4.2.0-beta.1 (2023-04-11)

### Features Added

- Added support for challenge-based and multi-tenant authentication.

## 4.1.0 (2022-10-11)

### Features Added

- Keyvault 7.3 support added for Secrets.

## 4.1.0-beta.1 (2022-07-07)

### Features Added

- Keyvault 7.3 support added for Secrets.

### Breaking Changes

- Removed ServiceVersion type, replaced with ApiVersion field in the SecretClientOptions type.

## 4.0.0 (2022-06-07)

### Breaking Changes

- Renamed `keyvault_secrets.hpp` to `secrets.hpp`.

## 4.0.0-beta.2 (2022-03-08)

- Second preview.
  - Internal improvements. 

## 4.0.0-beta.1 (2021-09-08)

- initial preview
