# /sys/version-history

The `/sys/version-history` endpoint is used to retrieve the version history of a Vault.

### Read version history

This endpoint returns the version history of the Vault. The response will contain the following keys:

* `keys`: a list of installed versions in chronological order based on the time installed
* `key_info`: a map indexed by the versions found in the `keys` list containing the following subkeys:
  * `build_date`: the time (in UTC) at which the Vault binary used to run the Vault server was built. **Note: Only tracked from version 1.11.0 or greater**
  * `previous_version`: the version installed prior to this version or `null` if no prior version exists
  * `timestamp_installed`: the time (in UTC) at which the version was installed

| Method | Path                   |
| ------ | ---------------------- |
| `LIST` | `/sys/version-history` |

#### Sample request

```shell-session
$ curl \
    -X LIST --header "X-Vault-Token: ..." \
    http://127.0.0.1:8200/v1/sys/version-history
```

#### Sample response

```json
{
  "keys": ["1.9.0", "1.9.1", "1.9.2", "1.11.0"],
  "key_info": {
    "1.9.0": {
      "build_date": null,
      "previous_version": null,
      "timestamp_installed": "2021-11-18T10:23:16Z"
    },
    "1.9.1": {
      "build_date": null,
      "previous_version": "1.9.0",
      "timestamp_installed": "2021-12-13T11:09:52Z"
    },
    "1.9.2": {
      "build_date": null,
      "previous_version": "1.9.1",
      "timestamp_installed": "2021-12-23T10:56:37Z"
    },
    "1.11.0": {
      "build_date": "2022-05-03T08:34:11Z",
      "previous_version": null,
      "timestamp_installed": "2022-05-03T13:16:04Z"
    }
  }
}
```