diff --git a/.github/workflows/qa.yaml b/.github/workflows/qa.yaml
index e90af93..9c71b7b 100644
--- a/.github/workflows/qa.yaml
+++ b/.github/workflows/qa.yaml
@@ -10,8 +10,8 @@ jobs:
   tests:
     strategy:
       matrix:
-        php: [ '7.4','8.0','8.1' ]
-    runs-on: ubuntu-22.04
+        php: [ '7.4','8.0','8.1','8.2','8.3','8.4' ]
+    runs-on: ubuntu-24.04
     steps:
 
       - name: Setup PHP
@@ -20,40 +20,37 @@ jobs:
           php-version: ${{ matrix.php }}
           extensions: mbstring, intl
           coverage: xdebug
-          tools: composer:v2
+          tools: phing:v3
 
       - uses: actions/checkout@v2
 
-      - name: Download phing
-        run: mkdir bin && curl -L -C - -s -S -o bin/phing https://github.com/phingofficial/phing/releases/download/3.0.0-RC3/phing-3.0.0-RC3.phar && chmod +x bin/phing
-
       - name: Phing setup
-        run: bin/phing setup
+        run: phing setup
 
       - name: lint php
-        run: bin/phing php:lint
+        run: phing php:lint
 
       - name: validate composer
-        run: bin/phing composer:validate
+        run: phing composer:validate
 
       - name: behat
-        run: bin/phing behat:run
+        run: phing behat:run
 
-      - name: psalm
-        run: bin/phing psalm:run
+#       - name: psalm
+#         run: phing psalm:run
 
       - name: phpstan
-        run: bin/phing phpstan:analyse
+        run: phing phpstan:analyse
 
       - name: CC before build
-        run: bin/phing cc:before-build
+        run: phing cc:before-build
         env:
           CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
 
       - name: PHPUnit
-        run: bin/phing phpunit:run
+        run: phing phpunit:run
 
       - name: CC after build
-        run: bin/phing cc:after-build
+        run: phing cc:after-build
         env:
           CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
diff --git a/README.md b/README.md
index cc1cd35..172a320 100644
--- a/README.md
+++ b/README.md
@@ -95,7 +95,7 @@ Contributing
 
 - If you liked this project, ⭐ star it on GitHub.
   [![GitHub Repo stars](https://img.shields.io/github/stars/jawira/case-converter?style=social)](https://github.com/jawira/case-converter)
-- Or follow me on Twitter.
+- Or follow me on X.
   [![Twitter Follow](https://img.shields.io/twitter/follow/jawira?style=social)](https://twitter.com/jawira)
 
 License
diff --git a/composer.json b/composer.json
index 6643d8d..24a3f65 100644
--- a/composer.json
+++ b/composer.json
@@ -31,9 +31,8 @@
   },
   "require-dev": {
     "behat/behat": "^3.0",
-    "phpstan/phpstan": "^1.0",
-    "phpunit/phpunit": "^9.0",
-    "vimeo/psalm": "^4.0"
+    "phpstan/phpstan": "^v2",
+    "phpunit/phpunit": "^9.0"
   },
   "suggest": {
     "pds/skeleton": "PHP Package Development Standards",
diff --git a/psalm.xml b/psalm.xml
index 81e5982..68220c0 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -1,6 +1,8 @@
 <?xml version="1.0"?>
 <psalm errorLevel="1"
        resolveFromConfigFile="true"
+       findUnusedCode="false"
+       findUnusedBaselineEntry="true"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="https://getpsalm.org/schema/config"
        xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd">
diff --git a/src/Glue/Gluer.php b/src/Glue/Gluer.php
index 99a1763..9148c9c 100644
--- a/src/Glue/Gluer.php
+++ b/src/Glue/Gluer.php
@@ -80,7 +80,7 @@ protected function glueUsingRules(string $glue, int $wordsMode, ?int $firstWordM
     {
         $convertedWords = $this->changeWordsCase($this->words, $wordsMode);
 
-        if ($firstWordMode) {
+        if (is_int($firstWordMode)) {
             $convertedWords = $this->changeFirstWordCase($convertedWords, $firstWordMode);
         }
 
diff --git a/src/Split/Splitter.php b/src/Split/Splitter.php
index 46119ba..cd4bf65 100644
--- a/src/Split/Splitter.php
+++ b/src/Split/Splitter.php
@@ -41,6 +41,10 @@ abstract public function split(): array;
      */
     protected function splitUsingPattern(string $inputString, string $pattern): array
     {
+        if (empty($pattern)) {
+            throw new CaseConverterException('Pattern must not be empty.'); // @codeCoverageIgnore
+        }
+
         $words = preg_split($pattern, $inputString, 0, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
 
         if ($words === false) {