diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 550e711..2404a74 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-versions: [ '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3' ]
+        php-versions: [ '5.3', '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3' ]
 
     name: Run Unit Test on PHP ${{ matrix.php-versions }}
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9a17e8..e7cc555 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 All notable changes to `Spark Plug` will be documented in this file.
 
+## [0.6.3](https://github.com/rougin/spark-plug/compare/v0.6.2...v0.6.3) - 2024-10-21
+
+### Changed
+- Minimum PHP version to `v5.3.0`
+
 ## [0.6.2](https://github.com/rougin/spark-plug/compare/v0.6.1...v0.6.2) - 2024-09-29
 
 ### Added
diff --git a/composer.json b/composer.json
index 3c135d1..67cd883 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
   ],
   "require":
   {
-    "php": ">=5.4.0"
+    "php": ">=5.3.0"
   },
   "require-dev":
   {