diff --git a/Cargo.toml b/Cargo.toml
index f129315..644be7c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,13 +16,13 @@ edition = "2024"
 license = "Apache-2.0"
 repository = "https://github.com/Agent-Card/ai-catalog-rust"
 rust-version = "1.95"
-version = "0.2.1"
+version = "0.3.0"
 
 [workspace.dependencies]
-ai-catalog = { path = "crates/ai-catalog", version = "0.2.1" }
-ai-catalog-oci = { path = "crates/ai-catalog-oci", version = "0.2.1" }
-ai-catalog-trust = { path = "crates/ai-catalog-trust", version = "0.2.1" }
-ai-catalog-validate = { path = "crates/ai-catalog-validate", version = "0.2.1" }
+ai-catalog = { path = "crates/ai-catalog", version = "0.3.0" }
+ai-catalog-oci = { path = "crates/ai-catalog-oci", version = "0.3.0" }
+ai-catalog-trust = { path = "crates/ai-catalog-trust", version = "0.3.0" }
+ai-catalog-validate = { path = "crates/ai-catalog-validate", version = "0.3.0" }
 base64 = "0.22"
 regex = "1"
 serde = { version = "1.0", features = ["derive"] }
diff --git a/crates/ai-catalog-oci/CHANGELOG.md b/crates/ai-catalog-oci/CHANGELOG.md
index f45510a..e64a74c 100644
--- a/crates/ai-catalog-oci/CHANGELOG.md
+++ b/crates/ai-catalog-oci/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.0](https://github.com/Agent-Card/ai-catalog-rust/compare/ai-catalog-oci-v0.2.1...ai-catalog-oci-v0.3.0) - 2026-09-10
+
+### Added
+
+- add known media type constants ([#23](https://github.com/Agent-Card/ai-catalog-rust/pull/23))
+
 ## [0.2.1](https://github.com/Agent-Card/ai-catalog-rust/compare/ai-catalog-oci-v0.2.0...ai-catalog-oci-v0.2.1) - 2026-09-01
 
 ### Other
diff --git a/crates/ai-catalog-validate/CHANGELOG.md b/crates/ai-catalog-validate/CHANGELOG.md
index 4b9b522..dea6515 100644
--- a/crates/ai-catalog-validate/CHANGELOG.md
+++ b/crates/ai-catalog-validate/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.0](https://github.com/Agent-Card/ai-catalog-rust/compare/ai-catalog-validate-v0.2.1...ai-catalog-validate-v0.3.0) - 2026-09-10
+
+### Added
+
+- add known media type constants ([#23](https://github.com/Agent-Card/ai-catalog-rust/pull/23))
+
 ## [0.2.1](https://github.com/Agent-Card/ai-catalog-rust/compare/ai-catalog-validate-v0.2.0...ai-catalog-validate-v0.2.1) - 2026-09-01
 
 ### Other
diff --git a/crates/ai-catalog/CHANGELOG.md b/crates/ai-catalog/CHANGELOG.md
index 7d0ba62..86edc72 100644
--- a/crates/ai-catalog/CHANGELOG.md
+++ b/crates/ai-catalog/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.0](https://github.com/Agent-Card/ai-catalog-rust/compare/ai-catalog-v0.2.1...ai-catalog-v0.3.0) - 2026-09-10
+
+### Added
+
+- add known media type constants ([#23](https://github.com/Agent-Card/ai-catalog-rust/pull/23))
+
 ## [0.2.1](https://github.com/Agent-Card/ai-catalog-rust/compare/ai-catalog-v0.2.0...ai-catalog-v0.2.1) - 2026-09-01
 
 ### Other