diff --git a/CHANGELOG.md b/CHANGELOG.md
index 72741b8..1314fd8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.2.1] - 2026-05-20
+
+### Changed
+
+- Bump `arborist-metrics` dependency from 0.1.2 to 0.1.3.
+- README: add "Built with AI · Powered by StrayMark" and "Copyright" sections
+  mirroring the format used in the upstream `arborist-metrics` repository.
+
+### Added
+
+- SPDX-License-Identifier and copyright header on every Rust source under
+  `src/` and `tests/cli/`, aligning with the Rust ecosystem convention and
+  the same change adopted in `arborist-metrics` v0.1.3.
+
 ## [0.2.0] - 2026-04-04
 
 ### Added
@@ -41,7 +55,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - CI workflow with clippy lints and test suite.
 - Published to crates.io as `arborist-cli`.
 
-[Unreleased]: https://github.com/StrangeDaysTech/arborist-cli/compare/v0.2.0...HEAD
+[Unreleased]: https://github.com/StrangeDaysTech/arborist-cli/compare/v0.2.1...HEAD
+[0.2.1]: https://github.com/StrangeDaysTech/arborist-cli/compare/v0.2.0...v0.2.1
 [0.2.0]: https://github.com/StrangeDaysTech/arborist-cli/compare/v0.1.1...v0.2.0
 [0.1.1]: https://github.com/StrangeDaysTech/arborist-cli/compare/v0.1.0...v0.1.1
 [0.1.0]: https://github.com/StrangeDaysTech/arborist-cli/releases/tag/v0.1.0
diff --git a/Cargo.lock b/Cargo.lock
index 5dcc7a7..4b3bc25 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -84,7 +84,7 @@ dependencies = [
 
 [[package]]
 name = "arborist-cli"
-version = "0.2.0"
+version = "0.2.1"
 dependencies = [
  "arborist-metrics",
  "assert_cmd",
diff --git a/Cargo.toml b/Cargo.toml
index 62bd305..7fe2a7e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "arborist-cli"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2024"
 description = "CLI for arborist-metrics: cognitive/cyclomatic complexity and SLOC metrics"
 license = "MIT OR Apache-2.0"
@@ -8,7 +8,22 @@ repository = "https://github.com/StrangeDaysTech/arborist-cli"
 readme = "README.md"
 keywords = ["complexity", "metrics", "cognitive", "cyclomatic", "cli"]
 categories = ["command-line-utilities", "development-tools"]
-exclude = [".straymark/", ".github/", ".claude/", ".specify/", "specs/", "tests/fixtures/"]
+exclude = [
+    ".agent/",
+    ".claude/",
+    ".cursor/",
+    ".cursorrules",
+    ".gemini/",
+    ".github/",
+    ".specify/",
+    ".straymark/",
+    "specs/",
+    "tests/fixtures/",
+    "AGENTS.md",
+    "CLAUDE.md",
+    "GEMINI.md",
+    "STRAYMARK.md",
+]
 
 [[bin]]
 name = "arborist"