diff --git a/packages/sea-builder/CHANGELOG.md b/packages/sea-builder/CHANGELOG.md
index 4dec5d8..c49f3ca 100644
--- a/packages/sea-builder/CHANGELOG.md
+++ b/packages/sea-builder/CHANGELOG.md
@@ -8,3 +8,48 @@ project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+### Added
+
+- `CHANGELOG.md` (#112).
+
+### Changed
+
+- Bumped the `cpy-cli` devDependency to v7 (#41).
+- Bumped the `semver` dependency to `^7.8.1` (#42).
+- Bumped the `undici` devDependency to `7.24.0` and `vitest` to
+  `^4.1.0` (#44).
+- Bumped the `undici` devDependency to v7.28.0 (#66).
+- Removed the unused, exact-pinned `undici` devDependency (#75).
+- **Breaking:** raised the `engines.node` floor from
+  `^20.11 || ^22 || >=24` to `^22.23.1 || ^24.2.0 || >=26.0.0`,
+  dropping Node.js 20, Node.js 22 below 22.23.1, Node.js 24 below
+  24.2.0, and every Node.js 25 release; bumped pnpm to v11 (#88).
+- Bumped the `typescript` devDependency to `~6.0.3` (#113).
+
+### Fixed
+
+- Restored CI signal on feature branches and pull requests, and
+  aligned the `@vitest/coverage-v8` peer with `vitest` v4 (#68).
+- Fixed the `env` shebang with a multi-word argument on Linux by
+  passing it with `-S` (#71).
+- Verified downloaded Node.js archives against their published
+  checksum before caching, and stopped writing directly into the
+  permanent download cache (#72).
+- Stopped `devPreinstall` from executing unpinned `pnpm dlx` packages
+  (#76).
+
+## [0.21.0] - 2025-10-03
+
+### Changed
+
+- Bumped the `listr2` dependency to `^9.0.4` (#19).
+- Bumped the `cpy-cli` devDependency to `^6.0.0`, `type-fest` to
+  `^5.0.1` (a major bump), `typescript` to `~5.9.3`, `undici` to
+  `7.16.0`, and `vite` to `^7.1.9` (#19).
+
+## [0.20.0] - 2025-06-30
+
+### Added
+
+- Initial release (#2).
diff --git a/packages/typescript-config/CHANGELOG.md b/packages/typescript-config/CHANGELOG.md
index 4dec5d8..905b631 100644
--- a/packages/typescript-config/CHANGELOG.md
+++ b/packages/typescript-config/CHANGELOG.md
@@ -8,3 +8,37 @@ project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+### Added
+
+- `CHANGELOG.md` (#112).
+
+### Changed
+
+- Bumped the `cpy-cli` devDependency to v7 (#41).
+- **Breaking:** raised the `engines.node` floor from
+  `^20.11 || ^22 || >=24` to `^22.23.1 || ^24.2.0 || >=26.0.0`,
+  dropping Node.js 20, Node.js 22 below 22.23.1, Node.js 24 below
+  24.2.0, and every Node.js 25 release; bumped pnpm to v11 (#88).
+- Bumped the `typescript` devDependency to `~6.0.3` (#113).
+
+## [0.21.0] - 2025-10-03
+
+### Changed
+
+- **Breaking:** enabled `erasableSyntaxOnly`, which rejects TypeScript
+  syntax that requires emit-time transformation (enums, parameter
+  properties, legacy `namespace`/`module` with runtime code, etc.)
+  (#19). This option requires TypeScript 5.8+; the advertised
+  `peerDependencies` range (`>=5.7.x`) was not updated, so consumers
+  on TypeScript 5.7 must upgrade their compiler to avoid an unknown
+  compiler option error.
+- Bumped the `cpy-cli` devDependency to `^6.0.0` and `typescript` to
+  `~5.9.3` (#19).
+
+## [0.20.0] - 2025-06-30
+
+### Added
+
+- Migrated from `kurone-kito/lints-config` (#2); its pre-migration
+  history will be backfilled in a follow-up (#108).
diff --git a/packages/vite-lib-config/CHANGELOG.md b/packages/vite-lib-config/CHANGELOG.md
index 4dec5d8..aafeec6 100644
--- a/packages/vite-lib-config/CHANGELOG.md
+++ b/packages/vite-lib-config/CHANGELOG.md
@@ -8,3 +8,60 @@ project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+### Added
+
+- `CHANGELOG.md` (#112).
+
+### Changed
+
+- Bumped the `cpy-cli` devDependency to v7 (#41).
+- Bumped the `vitest` devDependency to `^4.1.0` (#44).
+- **Breaking:** raised the `engines.node` floor from
+  `^20.11 || ^22 || >=24` to `^22.23.1 || ^24.2.0 || >=26.0.0`,
+  dropping Node.js 20, Node.js 22 below 22.23.1, Node.js 24 below
+  24.2.0, and every Node.js 25 release; bumped pnpm to v11 (#88).
+- **Breaking:** raised the shared `viteConfig`'s Vite build target
+  from `node20.11` to `node22.23`. Any package built through this
+  config — including this repository's own `sea-builder` — may now
+  emit syntax unsupported on Node.js 20, even when the build itself
+  runs on a supported Node.js version (#88).
+- Bumped the `typescript` devDependency to `~6.0.3` (#113).
+
+### Fixed
+
+- Restored CI signal on feature branches and pull requests, and
+  aligned the `@vitest/coverage-v8` peer with `vitest` v4 (#68).
+- Corrected the published API documentation for `viteConfig` and
+  `vitestConfig`. `viteConfig`'s JSDoc had the shebang/library-mode
+  branches inverted and omitted that nonexistent entries are filtered
+  out first (an empty result after filtering yields an empty
+  configuration) and that a mixed set of entries falls into library
+  mode; `vitestConfig`'s JSDoc had incorrectly described the same
+  shebang/library-mode logic instead of its actual behavior — merging
+  a `test.environment: 'node'` default under the `viteConfig` built
+  for the same entry point (#70).
+- Resolved `typedoc-plugin-markdown` explicitly to avoid a lookup
+  failure under pnpm's global virtual store, and added external link
+  mappings for Vite's `UserConfig`/`mergeConfig` symbols in the
+  generated API docs (#88).
+
+## [0.21.0] - 2025-10-03
+
+### Added
+
+- Added a TypeDoc-based API documentation generation pipeline (#19).
+
+### Changed
+
+- Bumped the `type-fest` dependency to `^5.0.1` (a major bump; used
+  by the exported `ViteConfigOptions` type) and `vite` to `^7.1.9`
+  (#19).
+- Bumped the `cpy-cli` devDependency to `^6.0.0` and `typescript` to
+  `~5.9.3` (#19).
+
+## [0.20.0] - 2025-06-30
+
+### Added
+
+- Initial release (#2).