diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 263a7d0..1bcca0a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,24 +1,24 @@
 name: Tests
 
 on:
-  push:
-    branches: [ master ]
-  pull_request:
+    push:
+        branches: [master]
+    pull_request:
 
 jobs:
-  phpunit:
-    strategy:
-      matrix:
-        php_version: [5.6, 7.0, 7.1, 7.2, 7.3, 7.4, 8.0, 8.1]
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: Setup PHP environment
-      uses: shivammathur/setup-php@v2
-      with:
-        php-version: ${{ matrix.php_version }}
-        coverage: xdebug
-    - name: Install dependencies
-      run: composer install
-    - name: PHPUnit check
-      run: ./vendor/bin/phpunit --coverage-text
+    phpunit:
+        strategy:
+            matrix:
+                php_version: [8.0, 8.1, 8.2, 8.3]
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - name: Setup PHP environment
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php_version }}
+                  coverage: xdebug
+            - name: Install dependencies
+              run: composer install
+            - name: PHPUnit check
+              run: ./vendor/bin/phpunit --coverage-text
diff --git a/composer.json b/composer.json
index a80b812..0197280 100644
--- a/composer.json
+++ b/composer.json
@@ -4,12 +4,12 @@
     "type": "library",
     "require": {
         "guzzlehttp/guzzle": "^6.2 || ^7.0",
-        "php": ">=5.6",
+        "php": ">=8.0",
         "ext-json": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7 || ^7.5 || ^8.5.19 || ^9.5.8",
-        "mockery/mockery": "~1.3.3 || ^1.4.2",
+        "phpunit/phpunit": "^9.5.8",
+        "mockery/mockery": "^1.4.2",
         "jetbrains/phpstorm-attributes": "^1.0",
         "friendsofphp/php-cs-fixer": "^3.54"
     },