diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e16d0fb..66bf904 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,9 +11,10 @@ jobs:
     strategy:
       matrix:
         os:
-          - ubuntu-24.04
+          - ubuntu-26.04
           - windows-2022
         php:
+          - 8.6
           - 8.5
           - 8.4
           - 8.3
@@ -45,7 +46,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.5
+          php-version: 8.6
           coverage: pcov
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text
diff --git a/composer.json b/composer.json
index 9aa4d04..d3a72b4 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
         "php": ">=7.1",
         "evenement/evenement": "^3.0 || ^2.0 || ^1.0",
         "react/dns": "^1.13",
-        "react/event-loop": "^1.2",
+        "react/event-loop": "^1.6",
         "react/promise": "^3.2 || ^2.6 || ^1.2.1",
         "react/stream": "^1.4"
     },
diff --git a/tests/SecureIntegrationTest.php b/tests/SecureIntegrationTest.php
index c5f3d41..1546724 100644
--- a/tests/SecureIntegrationTest.php
+++ b/tests/SecureIntegrationTest.php
@@ -3,6 +3,7 @@
 namespace React\Tests\Socket;
 
 use Evenement\EventEmitterInterface;
+use React\EventLoop\Loop;
 use React\Promise\Deferred;
 use React\Promise\Promise;
 use React\Socket\ConnectionInterface;
@@ -118,6 +119,14 @@ public function testSendDataWithEndToServerReceivesAllData()
         $client = await(timeout($this->connector->connect($this->address), self::TIMEOUT));
         /* @var $client ConnectionInterface */
 
+        // clear OpenSSL errors from closing the client before the server reads,
+        // as legacy PHP < 7.2 does not (https://bugs.php.net/bug.php?id=78775)
+        $client->on('close', function () {
+            Loop::futureTick(function () {
+                while (openssl_error_string() !== false);
+            });
+        });
+
         $data = str_repeat('a', 200000);
         $client->end($data);
 
@@ -180,6 +189,13 @@ public function testConnectToServerWhichSendsDataWithEndReceivesAllData()
     {
         $data = str_repeat('b', 100000);
         $this->server->on('connection', function (ConnectionInterface $peer) use ($data) {
+            // clear OpenSSL errors from closing the server side before the client reads,
+            // as legacy PHP < 7.2 does not (https://bugs.php.net/bug.php?id=78775)
+            $peer->on('close', function () {
+                Loop::futureTick(function () {
+                    while (openssl_error_string() !== false);
+                });
+            });
             $peer->end($data);
         });
 
diff --git a/tests/SocketServerTest.php b/tests/SocketServerTest.php
index dec6562..35b8b32 100644
--- a/tests/SocketServerTest.php
+++ b/tests/SocketServerTest.php
@@ -115,8 +115,8 @@ public function testConstructorThrowsForExistingUnixPath()
             $this->fail();
         } catch (\RuntimeException $e) {
             if ($e->getCode() === 0) {
-                // Zend PHP does not currently report a sane error
-                $this->assertStringEndsWith('Unknown error', $e->getMessage());
+                // PHP 8.6+ reports error message without errno, earlier versions do not report a sane error
+                $this->assertStringEndsWith(PHP_VERSION_ID >= 80600 ? 'Address already in use' : 'Unknown error', $e->getMessage());
             } else {
                 $this->assertEquals(SOCKET_EADDRINUSE, $e->getCode());
                 $this->assertStringEndsWith('Address already in use (EADDRINUSE)', $e->getMessage());