diff --git a/.github/workflows/tests.yml b/.github/workflows/test.yml
similarity index 88%
rename from .github/workflows/tests.yml
rename to .github/workflows/test.yml
index 8d96243..3a8f4f1 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,8 @@ env:
   DRUPAL_TESTING_DATABASE_USER: root
   DRUPAL_TESTING_DATABASE_PASSWORD: root
   DRUPAL_TESTING_DATABASE_ENGINE: mysql
-  DRUPAL_TESTING_SELENIUM_CHROME_VERSION: '105.0'
+  DRUPAL_TESTING_SELENIUM_CHROME_VERSION: 'latest'
+  DRUPAL_TESTING_USE_SELENIUM: 'false'
 
 jobs:
   test-projects:
@@ -24,11 +25,8 @@ jobs:
         RUN: [1, 2]
         include:
           - RUN: 1
-            DRUPAL_TESTING_DRUPAL_VERSION: '~10.0'
-            PHP_VERSION: '8.1'
-          - RUN: 2
-            DRUPAL_TESTING_DRUPAL_VERSION: '~10.0'
-            PHP_VERSION: '8.2'
+            DRUPAL_TESTING_DRUPAL_VERSION: '~11.3'
+            PHP_VERSION: '8.4'
 
     steps:
       - uses: actions/checkout@v1
@@ -44,7 +42,7 @@ jobs:
           sudo /etc/init.d/mysql start
 
       - name: Cache composer dependencies
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.composer/cache
           key: ${{ runner.os }}-composer-cache-${{ hashFiles('**/composer.json') }}
@@ -74,7 +72,7 @@ jobs:
       - uses: shivammathur/setup-php@v2
         with:
           coverage: none
-          php-version: '8.1'
+          php-version: '8.3'
           extensions: gd, pdo_mysql
 
       - name: Start MySql service
@@ -82,7 +80,7 @@ jobs:
           sudo /etc/init.d/mysql start
 
       - name: Cache composer dependencies
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.composer/cache
           key: ${{ runner.os }}-composer-cache-${{ hashFiles('**/composer.json') }}
@@ -90,7 +88,7 @@ jobs:
 
       - name: Cache NPM dependencies
         id: npm-cache
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ~/.npm
           key: ${{ runner.os }}-npm-cache
@@ -110,7 +108,7 @@ jobs:
         run: cd /tmp; tar cfz build.tgz test; mv build.tgz ${GITHUB_WORKSPACE}
 
       - name: Upload build
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v4
         with:
           name: build
           path: build.tgz
@@ -126,7 +124,7 @@ jobs:
       - uses: shivammathur/setup-php@v2
         with:
           coverage: none
-          php-version: '8.1'
+          php-version: '8.3'
           extensions: gd, pdo_mysql
 
       - name: Start MySql service
@@ -139,9 +137,10 @@ jobs:
           echo "$GITHUB_WORKSPACE/bin" >> $GITHUB_PATH
 
       - name: Download build
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v4
         with:
           name: build
+          path: build
 
       - name: Unzip build artifact
         run: tar xCfz /tmp build/build.tgz test; rm -rf build
diff --git a/composer.json b/composer.json
index f3dbcda..d06c23a 100644
--- a/composer.json
+++ b/composer.json
@@ -16,8 +16,7 @@
     ],
     "require": {
         "php": ">=7.2",
-        "drupal/coder": "^8.3",
-        "symfony/yaml": "^3.4"
+        "drupal/coder": "^8.3"
     },
     "config": {
         "allow-plugins": {
diff --git a/configuration.sh b/configuration.sh
index fb1c52d..1f00641 100644
--- a/configuration.sh
+++ b/configuration.sh
@@ -13,7 +13,8 @@ DRUPAL_TESTING_COMPOSER_PROJECT=${DRUPAL_TESTING_COMPOSER_PROJECT:-"drupal/recom
 
 # The drupal version to test against. This can be any valid composer version string, but only drupal versions greater 8.6
 # are supported. By default, we use the most recent stable version.
-DRUPAL_TESTING_DRUPAL_VERSION=${DRUPAL_TESTING_DRUPAL_VERSION:-$(git ls-remote --tags --sort=-version:refname https://github.com/drupal/core.git | grep -E -o '[0-9]+\.[0-9]\.[0-9]+$' | head -n1)}
+_drupal_latest_core=$(git ls-remote --tags --sort=-version:refname https://github.com/drupal/core.git | grep -E -o '[0-9]+\.[0-9]+\.[0-9]+$' | head -n1)
+DRUPAL_TESTING_DRUPAL_VERSION=${DRUPAL_TESTING_DRUPAL_VERSION:-"~${_drupal_latest_core%.*}"}
 
 # The version of the composer project to use.
 DRUPAL_TESTING_COMPOSER_PROJECT_VERSION=${DRUPAL_TESTING_COMPOSER_PROJECT_VERSION:-${DRUPAL_TESTING_DRUPAL_VERSION}}
@@ -190,7 +191,7 @@ export SYMFONY_DEPRECATIONS_HELPER=${SYMFONY_DEPRECATIONS_HELPER-weak}
 export SIMPLETEST_BASE_URL=${SIMPLETEST_BASE_URL:-http://${DRUPAL_TESTING_HTTP_HOST}:${DRUPAL_TESTING_HTTP_PORT}}
 
 # The driver args for webdriver.
-export MINK_DRIVER_ARGS_WEBDRIVER=${MINK_DRIVER_ARGS_WEBDRIVER-"[\"chrome\", {\"chromeOptions\": {\"w3c\": false } }, \"http://${DRUPAL_TESTING_SELENIUM_HOST}:${DRUPAL_TESTING_SELENIUM_PORT}/wd/hub\"]"}
+export MINK_DRIVER_ARGS_WEBDRIVER=${MINK_DRIVER_ARGS_WEBDRIVER-"[\"chrome\", {\"goog:chromeOptions\": {\"args\": [\"--headless\", \"--disable-gpu\", \"--no-sandbox\", \"--disable-dev-shm-usage\"]}}, \"http://${DRUPAL_TESTING_SELENIUM_HOST}:${DRUPAL_TESTING_SELENIUM_PORT}/wd/hub\"]"}
 
 # Increase composer memory limit.
 export COMPOSER_MEMORY_LIMIT=${COMPOSER_MEMORY_LIMIT:-"-1"}
diff --git a/lib/stages/prepare_build.sh b/lib/stages/prepare_build.sh
index efe902e..ab6bf34 100644
--- a/lib/stages/prepare_build.sh
+++ b/lib/stages/prepare_build.sh
@@ -15,6 +15,8 @@ _stage_prepare_build() {
     # Build is based on drupal project
     composer create-project "${DRUPAL_TESTING_COMPOSER_PROJECT}":"${DRUPAL_TESTING_COMPOSER_PROJECT_VERSION}" "${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}" --no-interaction --no-install
 
+    # Disable blocking on security advisories — this is a CI test environment, not production.
+    composer config audit.block-insecure false --working-dir="${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}"
     composer config "prefer-stable" true --working-dir="${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}"
 
     if [[ ${DRUPAL_TESTING_PROJECT_TYPE} != "drupal-profile" ]]; then
@@ -61,7 +63,7 @@ _stage_prepare_build() {
     composer config extra.enable-patching true --working-dir="${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}"
 
     # Use jq to find all dev dependencies of the project and add them to root composer file.
-    for dev_dependency in $(jq -r '.["require-dev"?] | keys[] as $k | "\($k):\(.[$k])"' "${DRUPAL_TESTING_PROJECT_BASEDIR}"/composer.json); do
+    for dev_dependency in $(jq -r '(.["require-dev"?] // {}) | keys[] as $k | "\($k):\(.[$k])"' "${DRUPAL_TESTING_PROJECT_BASEDIR}"/composer.json); do
         composer require "${dev_dependency}" --dev --no-update --working-dir="${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}"
     done
 
diff --git a/lib/stages/prepare_old_install.sh b/lib/stages/prepare_old_install.sh
index 3d7bfce..b8d57a7 100644
--- a/lib/stages/prepare_old_install.sh
+++ b/lib/stages/prepare_old_install.sh
@@ -23,6 +23,8 @@ _stage_prepare_old_install() {
     # Build is based on drupal project
     composer create-project "${DRUPAL_TESTING_COMPOSER_PROJECT}":"${DRUPAL_TESTING_UPGRADE_COMPOSER_PROJECT_VERSION}" "${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}" --no-interaction --no-install
 
+    # Disable blocking on security advisories — this is a CI test environment, not production.
+    composer config audit.block-insecure false --working-dir="${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}"
     composer config "prefer-stable" true --working-dir="${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}"
 
     # Reorder repositories, to make sure, local path is first.
diff --git a/lib/stages/prepare_upgrade.sh b/lib/stages/prepare_upgrade.sh
index 2534210..860d91b 100644
--- a/lib/stages/prepare_upgrade.sh
+++ b/lib/stages/prepare_upgrade.sh
@@ -39,7 +39,7 @@ _stage_prepare_upgrade() {
     # Set the path repository back to the project under test.
     composer config repositories.0 --json "{\"type\":\"path\", \"url\":\"${DRUPAL_TESTING_PROJECT_BASEDIR}\", \"options\":{\"symlink\": false}}" --working-dir="${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}"
     # Use jq to find all dev dependencies of the project and add them to root composer file.
-    for dev_dependency in $(jq -r '.["require-dev"?] | keys[] as $k | "\($k):\(.[$k])"' "${DRUPAL_TESTING_PROJECT_BASEDIR}"/composer.json); do
+    for dev_dependency in $(jq -r '(.["require-dev"?] // {}) | keys[] as $k | "\($k):\(.[$k])"' "${DRUPAL_TESTING_PROJECT_BASEDIR}"/composer.json); do
         composer require "${dev_dependency}" --dev --no-update --working-dir="${DRUPAL_TESTING_DRUPAL_INSTALLATION_DIRECTORY}"
     done
 
diff --git a/lib/stages/start_services.sh b/lib/stages/start_services.sh
index c454add..996bb2b 100644
--- a/lib/stages/start_services.sh
+++ b/lib/stages/start_services.sh
@@ -28,12 +28,27 @@ _stage_start_services() {
 
         if [ "${DRUPAL_TESTING_USE_SELENIUM}"  = true ]; then
             docker run --detach --net host --name "${DRUPAL_TESTING_SELENIUM_DOCKER_NAME}" --volume "${DRUPAL_TESTING_PROJECT_BASEDIR}":/project --volume /dev/shm:/dev/shm selenium/standalone-chrome:"${DRUPAL_TESTING_SELENIUM_CHROME_VERSION}"
+            wait_for_port "${DRUPAL_TESTING_SELENIUM_HOST}" "${DRUPAL_TESTING_SELENIUM_PORT}"
+            # Wait for Selenium node to register — port open ≠ Chrome node ready.
+            local selenium_status_url="http://${DRUPAL_TESTING_SELENIUM_HOST}:${DRUPAL_TESTING_SELENIUM_PORT}/status"
+            local ready_count=0
+            until curl -sf "${selenium_status_url}" | grep -q '"ready":true'; do
+                sleep 2
+                ready_count=$((ready_count + 1))
+                if [[ ${ready_count} -gt 15 ]]; then
+                    printf "Error: Selenium node did not become ready in time.\n" 1>&2
+                    exit 1
+                fi
+            done
+        elif command -v chromedriver > /dev/null 2>&1; then
+            # Use system ChromeDriver (pre-installed on GitHub Actions runners).
+            chromedriver --port="${DRUPAL_TESTING_SELENIUM_PORT}" --url-base=/wd/hub &
+            wait_for_port "${DRUPAL_TESTING_SELENIUM_HOST}" "${DRUPAL_TESTING_SELENIUM_PORT}"
         else
             download_chromedriver
             "${DRUPAL_TESTING_TEST_BASE_DIRECTORY}"/chromedriver --port="${DRUPAL_TESTING_SELENIUM_PORT}" --url-base=/wd/hub &
+            wait_for_port "${DRUPAL_TESTING_SELENIUM_HOST}" "${DRUPAL_TESTING_SELENIUM_PORT}"
         fi
-
-        wait_for_port "${DRUPAL_TESTING_SELENIUM_HOST}" "${DRUPAL_TESTING_SELENIUM_PORT}"
     fi
 
     if ! port_is_open "${DRUPAL_TESTING_HTTP_HOST}" "${DRUPAL_TESTING_HTTP_PORT}"; then
diff --git a/tests/module/module.info.yml b/tests/module/module.info.yml
index 883a6f1..932ebf7 100644
--- a/tests/module/module.info.yml
+++ b/tests/module/module.info.yml
@@ -2,4 +2,4 @@ name: Module
 type: module
 description: Drupal module with all sorts of tests, to test capabilities of the drupal-testing package.
 package: Drupal Testing
-core_version_requirement: ^9 || ^10
+core_version_requirement: ^9 || ^10 || ^11
diff --git a/tests/module/tests/FunctionalJavascript/ModuleControllerTest.php b/tests/module/tests/FunctionalJavascript/ModuleControllerTest.php
index 982965d..cf7f5ba 100644
--- a/tests/module/tests/FunctionalJavascript/ModuleControllerTest.php
+++ b/tests/module/tests/FunctionalJavascript/ModuleControllerTest.php
@@ -3,14 +3,16 @@
 namespace Drupal\Tests\module\FunctionalJavascript;
 
 use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\Attributes\RunTestsInSeparateProcesses;
 
 /**
  * Class ModuleControllerTest.
  *
  * Javascript tests.
- *
- * @group module
  */
+#[Group('module')]
+#[RunTestsInSeparateProcesses]
 class ModuleControllerTest extends WebDriverTestBase {
 
   /**
diff --git a/tests/module/tests/Unit/ModuleServiceTest.php b/tests/module/tests/Unit/ModuleServiceTest.php
index 03b6b08..73ff5c3 100644
--- a/tests/module/tests/Unit/ModuleServiceTest.php
+++ b/tests/module/tests/Unit/ModuleServiceTest.php
@@ -4,11 +4,15 @@
 
 use Drupal\module\Service;
 use Drupal\Tests\UnitTestCase;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Group;
 
 /**
- * @coversDefaultClass \Drupal\module\Service
- * @group module
+ * Tests for the Service class.
  */
+#[CoversClass(\Drupal\module\Service::class)]
+#[Group('module')]
 class ModuleServiceTest extends UnitTestCase {
   /**
    * The entity permission provider.
@@ -27,10 +31,9 @@ protected function setUp(): void {
   }
 
   /**
-   * @covers ::serve
-   *
-   * @dataProvider numberProvider
+   * Tests the serve method.
    */
+  #[DataProvider('numberProvider')]
   public function testServe($number, $serving): void {
     $this->assertEquals($serving, $this->service->serve($number));
   }
@@ -41,7 +44,7 @@ public function testServe($number, $serving): void {
    * @return array
    *   A list of number and the servings they generate.
    */
-  public function numberProvider(): array {
+  public static function numberProvider(): array {
     return [
       [1, 'You have been served a 1'],
     ];