diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fa78b8cd..3a593694 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
@@ -27,16 +28,17 @@ jobs:
           - 5.4
           - 5.3
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
           coverage: xdebug
           ini-file: development
           ini-values: disable_functions='' # do not disable PCNTL functions on PHP < 8.1
-          extensions: sockets, pcntl ${{ matrix.php >= 5.6 && ', event' || '' }} ${{ matrix.php >= 5.4 && (matrix.php < 8.0 && ', ev-1.1.5' || ', ev') || '' }}
+          extensions: sockets, pcntl ${{ matrix.php >= 5.6 && ', event' || '' }} ${{ matrix.php >= 5.4 && (matrix.php < 8.0 && ', ev-1.1.5' || ', ev-rosmanov/pecl-ev@1.2.4') || '' }}
         env:
           fail-fast: true # fail step if any extension can not be installed
+          EV_PATH: . # needed to build ext-ev from git on Ubuntu 26.04, see https://github.com/shivammathur/setup-php/issues/1146
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text
         if: ${{ matrix.php >= 7.3 }}
@@ -45,11 +47,12 @@ jobs:
 
   PHPUnit-Unstable:
     name: PHPUnit (Unstable PHP ${{ matrix.php }})
-    runs-on: ubuntu-22.04
+    runs-on: ${{ matrix.php >= 8.0 && 'ubuntu-26.04' || 'ubuntu-24.04' }} # legacy extensions do not build on 26.04
     continue-on-error: true
     strategy:
       matrix:
         php:
+          - 8.6
           - 8.5
           - 8.4
           - 8.3
@@ -66,7 +69,7 @@ jobs:
           - 5.4
           - 5.3
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
@@ -76,7 +79,7 @@ jobs:
       - name: Install ext-uv on PHP 7+
         run: |
           sudo apt-get update -q && sudo apt-get install libuv1-dev
-          echo "yes" | sudo pecl install ${{ matrix.php >= 8.0 && 'uv-0.3.0' || 'uv-0.2.4' }}
+          echo "yes" | sudo pecl install ${{ matrix.php >= 8.0 && 'uv-0.3.1' || 'uv-0.2.4' }}
           php -m | grep -q uv || echo "extension=uv.so" >> "$(php -r 'echo php_ini_loaded_file();')"
         if: ${{ matrix.php >= 7.0 }}
       - name: Install legacy ext-libevent on PHP < 7.0
@@ -89,7 +92,7 @@ jobs:
           make
           sudo make install
           popd
-          echo "extension=libevent.so" | sudo tee -a "$(php -r 'echo php_ini_loaded_file();')"
+          echo "extension=libevent.so" | sudo tee "$(php -r 'echo PHP_CONFIG_FILE_SCAN_DIR;')/99-libevent.ini" # load after ext-sockets
         if: ${{ matrix.php < 7.0 }}
       - name: Install legacy ext-libev on PHP < 7.0
         run: |
@@ -100,7 +103,7 @@ jobs:
           make
           sudo make install
           popd
-          echo "extension=libev.so" | sudo tee -a "$(php -r 'echo php_ini_loaded_file();')"
+          echo "extension=libev.so" | sudo tee "$(php -r 'echo PHP_CONFIG_FILE_SCAN_DIR;')/99-libev.ini" # load after ext-sockets
         if: ${{ matrix.php < 7.0 }}
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text
@@ -115,6 +118,7 @@ jobs:
     strategy:
       matrix:
         php:
+          - 8.6
           - 8.5
           - 8.4
           - 8.3
@@ -126,7 +130,7 @@ jobs:
           - 7.2
           - 7.1
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
@@ -141,10 +145,10 @@ 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/tests/StreamSelectLoopTest.php b/tests/StreamSelectLoopTest.php
index 7e2435a8..684dbabf 100644
--- a/tests/StreamSelectLoopTest.php
+++ b/tests/StreamSelectLoopTest.php
@@ -40,14 +40,13 @@ public function testStreamSelectTimeoutEmulation()
         $this->assertGreaterThan(0.04, $interval);
     }
 
-    public function testStreamSelectReportsWarningForStreamWithFilter()
+    public function testStreamSelectReportsWarningForMemoryStream()
     {
         if (defined('HHVM_VERSION')) {
             $this->markTestSkipped('Not supported on legacy HHVM');
         }
 
-        $stream = tmpfile();
-        stream_filter_append($stream, 'string.rot13');
+        $stream = fopen('php://memory', 'r+');
 
         $this->loop->addReadStream($stream, $this->expectCallableNever());
 
@@ -78,14 +77,13 @@ public function testStreamSelectReportsWarningForStreamWithFilter()
         $this->assertEquals($previous, $now);
     }
 
-    public function testStreamSelectThrowsWhenCustomErrorHandlerThrowsForStreamWithFilter()
+    public function testStreamSelectThrowsWhenCustomErrorHandlerThrowsForMemoryStream()
     {
         if (defined('HHVM_VERSION')) {
             $this->markTestSkipped('Not supported on legacy HHVM');
         }
 
-        $stream = tmpfile();
-        stream_filter_append($stream, 'string.rot13');
+        $stream = fopen('php://memory', 'r+');
 
         $this->loop->addReadStream($stream, $this->expectCallableNever());