diff --git a/CHANGELOG.md b/CHANGELOG.md
index fba314f..6d9d761 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [2.0.0](https://github.com/Universal-Commerce-Protocol/ucp-schema/compare/v1.4.1...v2.0.0) (2026-08-27)
+
+
+### ⚠ BREAKING CHANGES
+
+* ComposeError::UnknownParent is removed. Match arms naming it must be deleted; the equivalent condition now surfaces as ComposeError::OrphanExtension.
+
+### Bug Fixes
+
+* compose extensions when any parent is active ([#39](https://github.com/Universal-Commerce-Protocol/ucp-schema/issues/39)) ([613ee80](https://github.com/Universal-Commerce-Protocol/ucp-schema/commit/613ee804c4bad1efa0d98cd60b582a9c8a4599e6))
+* preserve schema resource identity in bundling, composition, and selection ([#66](https://github.com/Universal-Commerce-Protocol/ucp-schema/issues/66)) ([9f91c3d](https://github.com/Universal-Commerce-Protocol/ucp-schema/commit/9f91c3d497d8f9d7f4051fbfb49b2262536acfd7))
+
 ## [1.4.1](https://github.com/Universal-Commerce-Protocol/ucp-schema/compare/v1.4.0...v1.4.1) (2026-07-24)
 
 
diff --git a/Cargo.lock b/Cargo.lock
index 31a6ff0..3869f21 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2122,7 +2122,7 @@ checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
 [[package]]
 name = "ucp-schema"
-version = "1.4.1"
+version = "2.0.0"
 dependencies = [
  "assert_cmd",
  "clap",
diff --git a/Cargo.toml b/Cargo.toml
index 1e270a1..8610325 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ucp-schema"
-version = "1.4.1"
+version = "2.0.0"
 edition = "2021"
 license = "Apache-2.0"
 description = "Runtime resolution of UCP schema annotations"