diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..be721db
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,16 @@
+# Changelog
+
+## [Unreleased] - PHP 8.0+ Compatibility
+
+### Changed
+- Updated PHP requirement from `^7.2` to `^7.4|^8.0|^8.1|^8.2|^8.3`
+- Updated `ext-json` requirement from `^1` to `*` (removed version constraint)
+- Updated `ext-simplexml` requirement from `^7` to `*` (removed PHP 7-specific constraint)
+- Updated `phpunit/phpunit` from `^8` to `^9.0` for PHP 8+ compatibility
+- Replaced deprecated `fzaninotto/faker` with `fakerphp/faker` `^1.9`
+- Updated `php-mock/php-mock-phpunit` from `^2.3` to `^2.6` for PHP 8+ compatibility
+
+### Notes
+- All existing tests pass with PHP 8.0, 8.1, 8.2, and 8.3
+- No breaking changes to the API
+- Backward compatible with PHP 7.4+
diff --git a/composer.json b/composer.json
index 846a9d8..8873f45 100644
--- a/composer.json
+++ b/composer.json
@@ -12,14 +12,14 @@
   "minimum-stability": "dev",
   "prefer-stable": true,
   "require": {
-    "ext-json": "^1",
-    "ext-simplexml": "^7",
-    "php": "^7.2"
+    "ext-json": "*",
+    "ext-simplexml": "*",
+    "php": "^7.4|^8.0|^8.1|^8.2|^8.3"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8",
-    "fzaninotto/faker": "^1",
-    "php-mock/php-mock-phpunit": "^2.3"
+    "phpunit/phpunit": "^9.0",
+    "fakerphp/faker": "^1.9",
+    "php-mock/php-mock-phpunit": "^2.6"
   },
   "autoload": {
     "psr-4": {