diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index efe8870f..f42a7a7f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,10 +7,11 @@ on:
 jobs:
   PHPUnit:
     name: PHPUnit (PHP ${{ matrix.php }})
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     strategy:
       matrix:
         php:
+          - 8.6
           - 8.5
           - 8.4
           - 8.3
@@ -27,7 +28,7 @@ jobs:
           - 5.4
           - 5.3
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
@@ -41,10 +42,10 @@ jobs:
 
   PHPUnit-hhvm:
     name: PHPUnit (HHVM)
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-26.04
     continue-on-error: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - run: cp "$(which composer)" composer.phar && ./composer.phar self-update --2.2 # downgrade Composer for HHVM
       - name: Run hhvm composer.phar install
         uses: docker://hhvm/hhvm:3.30-lts-latest
diff --git a/composer.json b/composer.json
index 42a9f83c..a64116f6 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
         "evenement/evenement": "^3.0 || ^2.0 || ^1.0",
         "fig/http-message-util": "^1.1",
         "psr/http-message": "^2.0 || ^1.0",
-        "react/event-loop": "^1.2",
+        "react/event-loop": "^1.6",
         "react/promise": "^3.2 || ^2.3 || ^1.2.1",
         "react/socket": "^1.16",
         "react/stream": "^1.4"
diff --git a/tests/FunctionalHttpServerTest.php b/tests/FunctionalHttpServerTest.php
index dcd79b3e..99bdc84e 100644
--- a/tests/FunctionalHttpServerTest.php
+++ b/tests/FunctionalHttpServerTest.php
@@ -139,6 +139,16 @@ public function testSecureHttpsOnRandomPort()
         )));
         $http->listen($socket);
 
+        // 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)
+        $socket->on('connection', function (ConnectionInterface $conn) {
+            $conn->on('close', function () {
+                Loop::futureTick(function () {
+                    while (openssl_error_string() !== false);
+                });
+            });
+        });
+
         $result = $connector->connect($socket->getAddress())->then(function (ConnectionInterface $conn) {
             $conn->write("GET / HTTP/1.0\r\nHost: " . noScheme($conn->getRemoteAddress()) . "\r\n\r\n");
 
@@ -172,6 +182,16 @@ public function testSecureHttpsReturnsData()
         )));
         $http->listen($socket);
 
+        // 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)
+        $socket->on('connection', function (ConnectionInterface $conn) {
+            $conn->on('close', function () {
+                Loop::futureTick(function () {
+                    while (openssl_error_string() !== false);
+                });
+            });
+        });
+
         $connector = new Connector(array(
             'tls' => array('verify_peer' => false)
         ));
@@ -210,6 +230,16 @@ public function testSecureHttpsOnRandomPortWithoutHostHeaderUsesSocketUri()
         )));
         $http->listen($socket);
 
+        // 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)
+        $socket->on('connection', function (ConnectionInterface $conn) {
+            $conn->on('close', function () {
+                Loop::futureTick(function () {
+                    while (openssl_error_string() !== false);
+                });
+            });
+        });
+
         $result = $connector->connect($socket->getAddress())->then(function (ConnectionInterface $conn) {
             $conn->write("GET / HTTP/1.0\r\n\r\n");
 
diff --git a/tests/Io/AbstractMessageTest.php b/tests/Io/AbstractMessageTest.php
index 9e2c7d32..5cb02418 100644
--- a/tests/Io/AbstractMessageTest.php
+++ b/tests/Io/AbstractMessageTest.php
@@ -15,7 +15,7 @@ class MessageMock extends AbstractMessage
      */
     public function __construct($protocolVersion, array $headers, StreamInterface $body)
     {
-        return parent::__construct($protocolVersion, $headers, $body);
+        parent::__construct($protocolVersion, $headers, $body);
     }
 }