🤖 Automated update README: Wed Sep 24 01:26:02 UTC 2025 [skip ci]

Author: STAC CI

README.md

@@ -37,7 +37,7 @@ Below you can also find a list of extensions grouped by [maturity](#grouped-by-m
 | [CARD4L (Optical and SAR)](https://github.com/stac-extensions/card4l) | card4l | Item | Pilot | 0.1.0 | 2022-01-25 | Describes how to comply to the CEOS CARD4L specifications (SAR and Optical) with STAC |
 | [CEOS-ARD](https://github.com/stac-extensions/ceos-ard) | ceosard | Collection, Item | Proposal | 0.2.0 | 2024-05-07 | Describes how to comply to the CEOS-ARD specifications with STAC. Supersedes the STAC CARD4L extension. |
 | [CF](https://github.com/stac-extensions/cf) | cf | Collection, Item | Proposal | 0.2.0 | 2023-08-30 | Allows to provide the Standard Name Table based on the CF metadata convention. |
-| [CMIP6](https://github.com/stac-extensions/cmip6) | cmip6 | Item | Proposal | 2.0.0 | 2025-07-08 | None |
+| [CMIP6](https://github.com/stac-extensions/cmip6) | cmip6 | Item | Proposal | 3.0.0 | 2025-09-23 | None |
 | [Camera](https://github.com/linz/stac/tree/master/extensions/camera)* | camera | Collection, Item | *WIP* | *Unknown* | *Unknown* | Camera related metadata, such as focal length and sequence number. Especially useful for aerial imagery surveys. |
 | [Classification](https://github.com/stac-extensions/classification) | classification | Collection, Item | Pilot | 2.0.0 | 2024-05-18 | Describes categorical values and bitfields to give values in a file a certain meaning (classification). |
 | [Composite](https://github.com/stac-extensions/composite) | composite | Item | *WIP* | **Unreleased** | N/A | Defines how virtual assets can be composed from existing assets in STAC |
@@ -109,7 +109,7 @@ Below you can also find a list of extensions grouped by [maturity](#grouped-by-m
 | [link-templates](https://github.com/stac-extensions/link-templates) | - | Catalog, Collection, Item | *WIP* | **Unreleased** | N/A | A construct to provide templated links in STAC, as originally defined in OGC APIs. |
 | [xarray Assets](https://github.com/stac-extensions/xarray-assets) | xarray | Asset | Deprecated | 1.0.0 | 2021-06-30 | This extension helps users open STAC Assets with xarray. It gives a place for catalog maintainers to specify various required or recommended options. |
 
-* **Last updated:** Sep 23 2025, 01:25 UTC
+* **Last updated:** Sep 24 2025, 01:26 UTC
 * **Count:** 83
 
 ### Grouped by maturity