diff --git a/.github/workflows/code-style.yml b/.github/workflows/code-style.yml
index d27f9b3..f4243bb 100644
--- a/.github/workflows/code-style.yml
+++ b/.github/workflows/code-style.yml
@@ -13,7 +13,7 @@ jobs:
     
     strategy:
       matrix:
-        php-version: ['8.4', '8.5']
+        php-version: ['8.3', '8.4', '8.5']
     
     steps:
     - uses: actions/checkout@v4
@@ -28,9 +28,9 @@ jobs:
       uses: actions/cache@v3
       with:
         path: vendor
-        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ hashFiles('**/composer.json') }}
         restore-keys: |
-          ${{ runner.os }}-php-
+          ${{ runner.os }}-php-${{ matrix.php-version }}-
     
     - name: Install dependencies
       run: composer install --prefer-dist --no-progress
diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
index 747f442..d3ccece 100644
--- a/.github/workflows/phpstan.yml
+++ b/.github/workflows/phpstan.yml
@@ -13,7 +13,7 @@ jobs:
     
     strategy:
       matrix:
-        php-version: ['8.4', '8.5']
+        php-version: ['8.3', '8.4', '8.5']
     
     steps:
     - uses: actions/checkout@v4
@@ -32,9 +32,9 @@ jobs:
       uses: actions/cache@v3
       with:
         path: vendor
-        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        key: ${{ runner.os }}-php-${{ matrix.php-version }}-${{ hashFiles('**/composer.json') }}
         restore-keys: |
-          ${{ runner.os }}-php-
+          ${{ runner.os }}-php-${{ matrix.php-version }}-
     
     - name: Install dependencies
       run: composer install --prefer-dist --no-progress
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c2d9885..eb167e0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ['8.4', '8.5']
+        php: ['8.3', '8.4', '8.5']
 
     steps:
       - name: Checkout
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index bf1062e..f8a3dc7 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -11,10 +11,10 @@
     ->ignoreDotFiles(true)
     ->ignoreVCS(true);
 
-return new PhpCsFixer\Config()
+return (new PhpCsFixer\Config())
     ->setRules([
         '@PSR12' => true,
-        '@PHP84Migration' => true,
+        '@PHP83Migration' => true,
         'array_syntax' => ['syntax' => 'short'],
         'blank_line_after_namespace' => true,
         'blank_line_after_opening_tag' => true,
diff --git a/README.md b/README.md
index f28649f..22c1921 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ composer require valbeat/result
 
 ## Requirements
 
-- PHP 8.4 or higher (tested on PHP 8.4 and 8.5)
+- PHP 8.3 or higher (tested on PHP 8.3, 8.4 and 8.5)
 - Composer
 
 ## Basic Usage
diff --git a/composer.json b/composer.json
index e07f270..e806971 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": "^8.4"
+        "php": "^8.3"
     },
     "require-dev": {
         "phpstan/phpstan": "2.2.5",
diff --git a/phpstan.neon b/phpstan.neon
index ed05d1a..df6b243 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -13,7 +13,7 @@ parameters:
     checkBenevolentUnionTypes: true
     checkUninitializedProperties: true
     
-    # Supported PHP versions (8.4 - 8.5)
+    # Supported PHP versions (8.3 - 8.5)
     phpVersion:
-        min: 80400
+        min: 80300
         max: 80500
\ No newline at end of file