diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ac38a1e..ad08c21 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -68,3 +68,78 @@ jobs:
       - name: Print logs
         if: failure()
         run: php .github/print-logs.php
+
+  http3:
+    name: HTTP/3 (Linux + PHP 8.4)
+    runs-on: ubuntu-24.04
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install build dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y build-essential autoconf libtool pkg-config \
+            cmake ninja-build libgnutls28-dev libpsl-dev libnghttp2-dev git
+
+      # 发行版自带 libcurl 未编译 QUIC，这里从源码构建带 HTTP/3 的 curl
+      - name: Build curl with HTTP/3 (ngtcp2 + nghttp3)
+        run: |
+          set -e
+          PREFIX=/usr/local
+          export PKG_CONFIG_PATH=$PREFIX/lib/pkgconfig:$PKG_CONFIG_PATH
+
+          git clone --depth 1 --branch v1.6.0 https://github.com/ngtcp2/nghttp3.git
+          cd nghttp3
+          git submodule update --init
+          autoreconf -fi
+          ./configure --prefix=$PREFIX --enable-lib-only
+          make -j"$(nproc)"
+          sudo make install
+          cd ..
+
+          git clone --depth 1 --branch v1.6.0 https://github.com/ngtcp2/ngtcp2.git
+          cd ngtcp2
+          git submodule update --init
+          autoreconf -fi
+          ./configure --prefix=$PREFIX --enable-lib-only --with-gnutls
+          make -j"$(nproc)"
+          sudo make install
+          cd ..
+
+          git clone --depth 1 --branch curl-8_10_1 https://github.com/curl/curl.git
+          cd curl
+          autoreconf -fi
+          ./configure --prefix=$PREFIX --with-gnutls --with-nghttp2 \
+            --with-nghttp3 --with-ngtcp2
+          make -j"$(nproc)"
+          sudo make install
+          cd ..
+
+          echo "$PREFIX/lib" | sudo tee /etc/ld.so.conf.d/zz-local.conf
+          sudo ldconfig
+          /usr/local/bin/curl --version | head -n1
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+          extensions: curl, openssl, mbstring, json
+          coverage: none
+          tools: composer:v2
+
+      # 若环境仍不支持 HTTP/3，直接让 job 失败，避免“假绿”
+      - name: Verify HTTP/3 support
+        run: |
+          php -r 'exit((defined("CURL_VERSION_HTTP3") && (curl_version()["features"] & CURL_VERSION_HTTP3)) ? 0 : 1);'
+          php -r 'echo "libcurl: " . curl_version()["version"] . PHP_EOL;'
+
+      - name: Install dependencies
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Run HTTP/3 tests
+        run: ./vendor/bin/phpunit -c ./tests/phpunit.xml --filter Http3Test
+
+      - name: Print server logs (on failure)
+        if: failure()
+        run: php .github/print-logs.php
diff --git a/README.md b/README.md
index e11980a..4652d14 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 
 YurunHttp，支持智能识别 Curl/Swoole 场景的高性能 Http Client。
 
-支持链式操作，简单易用。支持并发批量请求、HTTP2、WebSocket 全双工通信协议。
+支持链式操作，简单易用。支持并发批量请求、HTTP2、HTTP3、WebSocket 全双工通信协议。
 
 非常适合用于开发通用 SDK 包，不必再为 Swoole 协程兼容而头疼！
 
@@ -28,6 +28,7 @@ YurunHttp 的目标是做最好用的 PHP HTTP Client 开发包！
 * SSL 证书（HTTPS）
 * 并发批量请求
 * HTTP2
+* HTTP3（Curl Handler，基于 QUIC）
 * WebSocket
 * Curl & Swoole 环境智能兼容
 * 连接池
@@ -46,6 +47,8 @@ API 文档：[https://apidoc.gitee.com/yurunsoft/YurunHttp](https://apidoc.gitee
 
 > 每个小版本的更新日志请移步到 Release 查看
 
+v5.1.0 支持 HTTP/3（基于 QUIC，Curl Handler，需 libcurl >= 7.66 且编译 QUIC 支持；Swoole Handler 不支持）
+
 v5.0.1 支持 WebSocket 压缩及指定 Opcode
 
 v5.0.0 支持 `psr/http-message` `~2.0` 版本 (PHP >= 7.1)
@@ -267,6 +270,23 @@ Curl: `php --ri curl`
 
 Swoole: `php --ri swoole`
 
+### Http3 用法
+
+> 仅支持 Curl Handler（基于 QUIC），Swoole Handler 会抛出异常。
+
+```php
+$http = new HttpRequest;
+$http->protocolVersion = '3.0'; // 这句是关键
+$response = $http->get('https://www.taobao.com/');
+```
+
+使用 HTTP/3 需注意：
+
+* 必须使用 HTTPS 地址（QUIC over TLS）。
+* 需要 libcurl >= 7.66 且编译了 QUIC 支持（ngtcp2 / quiche），可通过 `php --ri curl` 查看。
+* 当服务器不支持 HTTP/3 时，Curl 会自动降级到 HTTP/2 / HTTP/1.1。
+* Swoole Handler 不支持 HTTP/3，发起 `3.0` 请求会抛出 `Swoole handler does not support HTTP/3` 异常。
+
 ### Http2 全双工用法
 
 > 该用法仅支持 Swoole
diff --git a/composer.json b/composer.json
index 1d5a69a..818d557 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "yurunsoft/yurun-http",
-    "description": "YurunHttp 是开源的 PHP HTTP 类库，支持链式操作，简单易用。支持 Curl、Swoole，支持 Http、Http2、WebSocket！",
+    "description": "YurunHttp 是开源的 PHP HTTP 类库，支持链式操作，简单易用。支持 Curl、Swoole，支持 Http、Http2、Http3、WebSocket！",
     "require": {
         "php": ">=7.1",
         "psr/http-message": "~1.0|~2.0",
diff --git a/phpstan.neon b/phpstan.neon
index 1be0aa9..bbb04d4 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -26,4 +26,5 @@ parameters:
         -
             message: '#Method \S+ has no return typehint specified.#'
             paths:
-                - tests/unit/**Test.php
\ No newline at end of file
+                - tests/unit/**Test.php
+        - '#Constant CURL_HTTP_VERSION_3 not found.#'
diff --git a/src/YurunHttp/Handler/Curl.php b/src/YurunHttp/Handler/Curl.php
index 9d2c40e..99bc479 100644
--- a/src/YurunHttp/Handler/Curl.php
+++ b/src/YurunHttp/Handler/Curl.php
@@ -366,6 +366,10 @@ private function buildCurlHandlerEx(&$request, $handler, $uri = null, $method =
                     $httpVersion = \CURL_HTTP_VERSION_2;
                 }
                 break;
+            case '3.0':
+                // HTTP/3 基于 QUIC，需 libcurl >= 7.66 且编译了 QUIC 支持
+                $httpVersion = \defined('\CURL_HTTP_VERSION_3') ? CURL_HTTP_VERSION_3 : 30;
+                break;
             default:
                 $httpVersion = \CURL_HTTP_VERSION_1_1;
                 break;
@@ -419,6 +423,10 @@ private function getResponse($request, $handler, $body, $receiveHeaders)
         // body
         $result = new Response($body, curl_getinfo($handler, \CURLINFO_HTTP_CODE));
 
+        // 实际使用的 HTTP 协议版本（CURLINFO_HTTP_VERSION 自 PHP 7.3 引入）
+        $curlHttpVersion = \defined('\CURLINFO_HTTP_VERSION') ? curl_getinfo($handler, \CURLINFO_HTTP_VERSION) : 0;
+        $httpVersion = $this->getCurlHttpVersion($curlHttpVersion);
+
         // headers
         $headers = $this->parseHeaderOneRequest($receiveHeaders);
         foreach ($headers as $name => $value)
@@ -443,10 +451,35 @@ private function getResponse($request, $handler, $body, $receiveHeaders)
 
         return $result->withRequest($request)
                       ->withCookieOriginParams($cookies)
+                      ->withHttpVersion($httpVersion)
                       ->withError(curl_error($handler))
                       ->withErrno(curl_errno($handler));
     }
 
+    /**
+     * 将 curl 的 CURLINFO_HTTP_VERSION 枚举值转换为协议版本字符串.
+     *
+     * @param int $version
+     *
+     * @return string
+     */
+    private function getCurlHttpVersion($version)
+    {
+        switch ($version)
+        {
+            case \defined('\CURL_HTTP_VERSION_1_0') ? \CURL_HTTP_VERSION_1_0 : 1:
+                return '1.0';
+            case \defined('\CURL_HTTP_VERSION_1_1') ? \CURL_HTTP_VERSION_1_1 : 2:
+                return '1.1';
+            case \defined('\CURL_HTTP_VERSION_2') ? \CURL_HTTP_VERSION_2 : 3:
+                return '2.0';
+            case \defined('\CURL_HTTP_VERSION_3') ? CURL_HTTP_VERSION_3 : 30:
+                return '3.0';
+            default:
+                return '';
+        }
+    }
+
     /**
      * parseHeaderOneRequest.
      *
@@ -615,7 +648,7 @@ private function parseHeaders(&$request, &$options)
         {
             $request = $request->withHeader('User-Agent', $request->getAttribute(Attributes::USER_AGENT, self::$defaultUA));
         }
-        if (!$request->hasHeader('Connection') && $request->getProtocolVersion() >= 1.1)
+        if (!$request->hasHeader('Connection') && $request->getProtocolVersion() >= 1.1 && '3.0' !== $request->getProtocolVersion())
         {
             $request = $request->withHeader('Connection', 'Keep-Alive')->withHeader('Keep-Alive', '300');
         }
diff --git a/src/YurunHttp/Handler/Swoole.php b/src/YurunHttp/Handler/Swoole.php
index ec68b01..3a32206 100644
--- a/src/YurunHttp/Handler/Swoole.php
+++ b/src/YurunHttp/Handler/Swoole.php
@@ -232,6 +232,10 @@ public function send(&$request)
      */
     public function sendDefer($request)
     {
+        if ('3.0' === $request->getProtocolVersion())
+        {
+            throw new \RuntimeException('Swoole handler does not support HTTP/3');
+        }
         $isHttp2 = '2.0' === $request->getProtocolVersion();
         if ($poolIsEnabled = $this->poolIsEnabled)
         {
diff --git a/src/YurunHttp/Http/Response.php b/src/YurunHttp/Http/Response.php
index f2b6835..7d294f7 100644
--- a/src/YurunHttp/Http/Response.php
+++ b/src/YurunHttp/Http/Response.php
@@ -56,6 +56,13 @@ class Response extends Psr7Response
      */
     protected $streamId;
 
+    /**
+     * 实际使用的 HTTP 协议版本，如 '1.1'、'2.0'、'3.0'.
+     *
+     * @var string
+     */
+    protected $httpVersion = '';
+
     /**
      * Request.
      *
@@ -374,6 +381,31 @@ public function getStreamId()
         return $this->streamId;
     }
 
+    /**
+     * 设置实际使用的 HTTP 协议版本.
+     *
+     * @param string $httpVersion
+     *
+     * @return static
+     */
+    public function withHttpVersion($httpVersion)
+    {
+        $self = clone $this;
+        $self->httpVersion = $httpVersion;
+
+        return $self;
+    }
+
+    /**
+     * 获取实际使用的 HTTP 协议版本，如 '1.1'、'2.0'、'3.0'.
+     *
+     * @return string
+     */
+    public function getHttpVersion()
+    {
+        return $this->httpVersion;
+    }
+
     /**
      * 设置请求体.
      *
diff --git a/tests/unit/Http3/Http3Test.php b/tests/unit/Http3/Http3Test.php
new file mode 100644
index 0000000..477b347
--- /dev/null
+++ b/tests/unit/Http3/Http3Test.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Yurun\Util\YurunHttp\Test\Http3;
+
+use Yurun\Util\HttpRequest;
+use Yurun\Util\YurunHttp;
+use Yurun\Util\YurunHttp\Handler\Curl;
+use Yurun\Util\YurunHttp\Test\BaseTest;
+
+class Http3Test extends BaseTest
+{
+    public function testHttp3(): void
+    {
+        // HTTP/3 仅 Curl Handler 支持
+        if (!\defined('\CURL_HTTP_VERSION_3'))
+        {
+            $this->markTestSkipped('CURL_HTTP_VERSION_3 未定义，当前 PHP/libcurl 版本不支持 HTTP/3');
+        }
+
+        $curlVersion = curl_version();
+        // HTTP/3 需要 libcurl >= 7.66.0（0x074200）
+        if ($curlVersion['version_number'] < 0x074200)
+        {
+            $this->markTestSkipped(sprintf('libcurl %s < 7.66.0，不支持 HTTP/3', $curlVersion['version']));
+        }
+
+        // 检测 libcurl 是否编译了 HTTP/3(QUIC) 支持
+        if (\defined('\CURL_VERSION_HTTP3') && !($curlVersion['features'] & \CURL_VERSION_HTTP3))
+        {
+            $this->markTestSkipped('当前 libcurl 未编译 HTTP/3(QUIC) 支持');
+        }
+
+        // 强制使用 Curl Handler（Swoole 不支持 HTTP/3）
+        YurunHttp::setDefaultHandler(Curl::class);
+
+        $http = new HttpRequest();
+        $http->protocolVersion = '3.0';
+        $http->timeout = 10000;
+        $http->connectTimeout = 10000;
+
+        $response = $http->get('https://www.taobao.com/');
+
+        // 环境/网络不支持时跳过，而不是判定失败
+        if (0 !== $response->errno())
+        {
+            $this->markTestSkipped(sprintf('HTTP/3 请求失败（环境/网络原因）: %s', $response->error()));
+        }
+
+        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertNotEmpty($response->getBody());
+
+        // 校验响应确实是 HTTP/3（QUIC）
+        $this->assertEquals('3.0', $response->getHttpVersion(), sprintf(
+            '响应协议版本不是 HTTP/3，实际为: %s',
+            $response->getHttpVersion()
+        ));
+    }
+}