diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 466df71..37fcefa 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0"
+  ".": "1.0.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..4aba6b9
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,8 @@
+# Changelog
+
+## [1.0.0](https://github.com/iwf-web/php-coding-standard/compare/0.1.0...1.0.0) (2025-12-19)
+
+
+### ✨ Features
+
+* Initial commit ([e20b5bc](https://github.com/iwf-web/php-coding-standard/commit/e20b5bc4565c7c92152cb76cc27569a0201fbef1))