# Session Token JWT v2

Key changes in v2 include a revamped structure for organization-related claims, now nested under the `o` claim for improved clarity and reduced token size. Additionally, a new `v` claim explicitly identifies the token version.

As of today, April 14, 2025, version 1 of the session token format is deprecated. You can update to version 2 via the [**Updates** page](https://dashboard.clerk.com/last-active?path=updates) in your Clerk Dashboard.

For a detailed breakdown of all claims available in v2 and how they differ from v1, please refer to our [Session Tokens documentation](https://clerk.com/docs/backend-requests/resources/session-tokens.md).

We strongly recommend using one of our SDKs that support API version [`2025-04-10`](https://clerk.com/docs/versioning/available-versions.md#2025-04-10) to handle decoding reliably.