diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..3fef9dd
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,30 @@
+# Changelog
+
+## [1.0.0](https://github.com/geekcell/php-ddd/compare/v2.0.0...v1.0.0) (2023年01月16日)
+
+
+### ⚠ BREAKING CHANGES
+
+* Make `Collection` an instantiable class.
+* Change Repository interface.
+* Use item and collection types as constructor arguments
+* Update contracts for command and query bus.
+
+### Features
+
+* Add `ValueObject` contract and implementations. ([c1a00b4](https://github.com/geekcell/php-ddd/commit/c1a00b451ef70e096d7fd5a105bbd635cb57da55))
+* Add command and query bus. ([848da2c](https://github.com/geekcell/php-ddd/commit/848da2c60a4c3ee459614804099baadd8fa1ff2e))
+
+
+### Code Refactoring
+
+* Change Repository interface. ([4e1b14a](https://github.com/geekcell/php-ddd/commit/4e1b14a7e16f4bf99748d764bbb14832661e4087))
+* Make `Collection` an instantiable class. ([3ca9db5](https://github.com/geekcell/php-ddd/commit/3ca9db517e24931d26145de7def76c416da94d15))
+* Update contracts for command and query bus. ([a5b8957](https://github.com/geekcell/php-ddd/commit/a5b89573ad5f282a5b8b510a815332a6f2fe2f0a))
+* Use item and collection types as constructor arguments ([050ffcc](https://github.com/geekcell/php-ddd/commit/050ffcce4ef49aa1db2921713f6a79d428c567d3))
+
+
+### Miscellaneous Chores
+
+* Apply PHP CS fixer fixes. ([8072b49](https://github.com/geekcell/php-ddd/commit/8072b49e198368e514c30e496e073ba2ff82a808))
+* Apply PHP CS fixer fixes. ([8e8c960](https://github.com/geekcell/php-ddd/commit/8e8c9608e03c332d1a43d16c5908b582bcac2c84))
diff --git a/composer.json b/composer.json
index 2d6eb4a..35a91b4 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,9 @@
 {
 "name": "geekcell/ddd",
+ "description": "Your ultimate guard rails for domain driven design with PHP.",
 "type": "library",
 "license": "MIT",
+ "version": "1.0.0",
 "autoload": {
 "psr-4": {
 "GeekCell\\Ddd\\": "src/",
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