conda · jaimergp · May 7, 2025 · Mar 14, 2025 · Mar 14, 2025 · Mar 14, 2025
diff --git a/README.md b/README.md
@@ -34,6 +34,8 @@ for conda's implementation, all major changes should be submitted as
 | [0021](cep-0021.md) | Run-exports in sharded Repodata                                             |
 | [0022](cep-0022.md) | Frozen environments                                                         |
 | [0023](cep-0023.md) | Text spec input files                                                       |
+| [0024](cep-0024.md) | Specification of <code>environment.yml</code> input files                   |
+| [0025](cep-0025.md) | Versioning of Existing conda Standards                                      |
 
 ## References
 

diff --git a/cep-0025.md b/cep-0025.md
@@ -0,0 +1,44 @@
+# CEP 25 - Versioning of Existing conda Standards
+
+<table>
+<tr><td> Title </td><td> CEP 25 - Versioning of Existing conda Standards and Specs </td></tr>
+<tr><td> Status </td><td> Approved  </td></tr>
+<tr><td> Author(s) </td><td> Matthew R. Becker &lt;becker.mr@gmail.com&gt;</td></tr>
+<tr><td> Created </td><td> Mar 14, 2025</td></tr>
+<tr><td> Updated </td><td> Mar 31, 2025</td></tr>
+<tr><td> Discussion </td><td> https://github.com/conda/ceps/pull/119 </td></tr>
+<tr><td> Implementation </td><td> NA </td></tr>
+</table>
+
+## Abstract
+
+As the conda ecosystem is being standardized and evolving, the existing standards
+(in many cases only documented by the code that implements them) have been called
+`v1` in some cases (e.g., `.tar.bz2` versus `.conda`) and `v0` in others (e.g., `v0` versus `v1` recipe formats).
+This differing nomenclature is confusing. In this CEP, we resolve this issue by establishing conventions on how to number existing and future `conda` standards.
+
+## Specification
+
+All existing conda standards which satisfy the following conditions
+
+- are documented formally in CEPs or are only effectively documented through code implementations
+- have not been superseded by a newer standard labeled `v1`
+
+MUST be versioned at `v1`.
+
+The numbering of build recipe formats is exempt from this CEP due to the fact
+that the new recipe format in [CEP 14](https://github.com/conda/ceps/blob/main/cep-0014.md) specified `schema_version: 1`.
+
+Standards MUST use a version specifier that consists only of numbers and a single period `.`, has a major version,
+and has at most a minor version (i.e. matches the regex `^[0-9]+($|\.[0-9]+$)`). A `v` MAY be prepended
+for clarity, but MUST be removed before comparing versions. Version comparisons and ordering MUST follow
+`conda`'s version comparison and ordering conventions.
+
+## Backwards Compatibility
+
+The `v1` versioning is fully backwards compatible with all current standards, except recipe formats
+which have been explicitly excluded.
+
+## Copyright
+
+All CEPs are explicitly [CC0 1.0 Universal](https://creativecommons.org/publicdomain/zero/1.0/).