diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cf9807c..365d96e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,6 +13,10 @@ permissions:
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version: ['8.1', '8.2', '8.3', '8.4']
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -20,7 +24,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.4'
+          php-version: ${{ matrix.php-version }}
           extensions: json, openssl, simplexml
           coverage: none
 
diff --git a/README.md b/README.md
index 9086729..089a75c 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ WeChatDeveloper 是一个面向 **微信** 与 **支付宝** 的轻量 PHP SDK
 
 ## 环境要求
 
-- PHP `>= 8.4`
+- PHP `>= 8.1`
 - `ext-json`
 - `ext-openssl`
 - `ext-simplexml`
diff --git a/composer.json b/composer.json
index fa48d6c..9cc9d7c 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     }
   ],
   "require": {
-    "php": ">=8.4",
+    "php": ">=8.1",
     "ext-json": "*",
     "ext-openssl": "*",
     "ext-simplexml": "*",
@@ -26,7 +26,7 @@
     "psr/simple-cache": "^3.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^11.5"
+    "phpunit/phpunit": "^10.5 || ^11.5"
   },
   "autoload": {
     "psr-4": {