diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c3ec0e0..f9c85b4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,12 +7,21 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        PHP_VERSION: [ "8.0", "8.1" ]
+        ROBO_VERSION: [ "4.0", "5.0" ]
+        PHP_VERSION: [ "8.2", "8.3" ]
+        include:
+          - ROBO_VERSION: "4.0"
+            PHP_VERSION: "8.0"
+          - ROBO_VERSION: "4.0"
+            PHP_VERSION: "8.1"
 
     steps:
       - uses: actions/checkout@v2
       - uses: php-actions/composer@v6
         with:
-          php_version: ${{ matrix.php_version }}
+          command: "require consolidation/robo:~${{ matrix.ROBO_VERSION }}"
+          php_version: ${{ matrix.PHP_VERSION }}
           version: 2
       - uses: php-actions/phpunit@v3
+        with:
+          test_suffix: FALSE
diff --git a/composer.json b/composer.json
index 6467db6..51a0e33 100644
--- a/composer.json
+++ b/composer.json
@@ -10,12 +10,12 @@
     }
   ],
   "require": {
-    "consolidation/robo": "^4.0"
+    "consolidation/robo": "^4.0 || ^5.0"
   },
   "require-dev": {
     "drupal/coder": "^8.3.16",
     "phpunit/phpunit": "^9.5.5",
-    "phpro/grumphp": "^1.14"
+    "phpro/grumphp": "^1.14 || ^2.3"
   },
   "autoload": {
     "psr-4": {
diff --git a/tests/TaskTest.php b/tests/TaskTest.php
index 702a39a..e2c9665 100644
--- a/tests/TaskTest.php
+++ b/tests/TaskTest.php
@@ -146,7 +146,7 @@ public function testProcess($config_file, $source_file, $processed_file) {
    * @return array
    *    Test data.
    */
-  public function appendTestProvider() {
+  public static function appendTestProvider() {
     return [
       ['1-config.yml', '1-input.php', '1-output-append.php'],
       ['2-config.yml', '2-input.php', '2-output-append.php'],
@@ -159,7 +159,7 @@ public function appendTestProvider() {
    * @return array
    *    Test data.
    */
-  public function prependTestProvider() {
+  public static function prependTestProvider() {
     return [
       ['1-config.yml', '1-input.php', '1-output-prepend.php'],
       ['2-config.yml', '2-input.php', '2-output-prepend.php'],
@@ -172,7 +172,7 @@ public function prependTestProvider() {
    * @return array
    *    Test data.
    */
-  public function writeTestProvider() {
+  public static function writeTestProvider() {
     return [
       ['3-config.yml', '3-output-write.php'],
     ];