diff --git a/.github/workflows/qa.yaml b/.github/workflows/qa.yaml
index 760ee0d1..1780c819 100644
--- a/.github/workflows/qa.yaml
+++ b/.github/workflows/qa.yaml
@@ -8,11 +8,11 @@ jobs:
   phpstan:
     name: PHPStan
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Install PHP with extensions
         uses: shivammathur/setup-php@v2
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index a9823b8b..23ae9a2f 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -5,7 +5,7 @@ on: [push, pull_request ]
 jobs:
     test:
         name: 'PHP ${{ matrix.php-version }} + ${{ matrix.dependencies }}'
-        runs-on: ubuntu-latest
+        runs-on: ubuntu-24.04
 
         strategy:
             fail-fast: false
@@ -16,9 +16,10 @@ jobs:
                 php-version:
                     - '8.2'
                     - '8.3'
+                    - '8.4'
         steps:
             - name: Checkout
-              uses: actions/checkout@v2
+              uses: actions/checkout@v4
             - name: Install PHP with extensions
               uses: shivammathur/setup-php@v2
               with:
@@ -28,6 +29,6 @@ jobs:
               uses: 'ramsey/composer-install@v1'
               with:
                   dependency-versions: '${{ matrix.dependencies }}'
-                  composer-options: '--prefer-dist --prefer-stable'
+                  composer-options: --prefer-dist --prefer-stable ${{ matrix.php-version == '8.4' && '--ignore-platform-req=php' || '' }}
             - name: Run Tests
               run: composer test
diff --git a/composer.json b/composer.json
index f8064196..f6aa84ce 100644
--- a/composer.json
+++ b/composer.json
@@ -21,12 +21,13 @@
     ],
     "require": {
         "php": ">=8.2",
-        "doctrine/orm": "^3.0 || ^2.18",
-        "symfony/property-access": "^7.0 || ^6.0",
-        "symfony/polyfill-php80": "^1.20"
+        "doctrine/orm": "^3.3",
+        "symfony/property-access": "^7.1",
+        "symfony/polyfill-php80": "^1.31"
     },
     "require-dev": {
-        "phpspec/phpspec": "^7.5"
+        "phpspec/phpspec": "^7.5",
+        "phpspec/prophecy": "^1.20"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/DBALTypesResolver.php b/src/DBALTypesResolver.php
index e639c557..a58cbdf8 100644
--- a/src/DBALTypesResolver.php
+++ b/src/DBALTypesResolver.php
@@ -52,7 +52,7 @@ public static function tryGetTypeForValue($value): ?Type
         $classNameParts = explode('\\', str_replace('_', '\\', $className));
         $typeName = array_pop($classNameParts);
 
-        if (null !== $typeName && array_key_exists($typeName, Type::getTypesMap())) {
+        if (array_key_exists($typeName, Type::getTypesMap())) {
             return Type::getType($typeName);
         }
 
diff --git a/src/Operand/PlatformFunction/Executor/SubstringExecutor.php b/src/Operand/PlatformFunction/Executor/SubstringExecutor.php
index 4b0c67ab..2db3cf73 100644
--- a/src/Operand/PlatformFunction/Executor/SubstringExecutor.php
+++ b/src/Operand/PlatformFunction/Executor/SubstringExecutor.php
@@ -21,7 +21,7 @@ final class SubstringExecutor
      * @param int      $offset
      * @param int|null $length
      *
-     * @return false|string
+     * @return string
      */
     public function __invoke(string $string, int $offset, ?int $length = null)
     {
diff --git a/src/Query/QueryModifierCollection.php b/src/Query/QueryModifierCollection.php
index 26463c43..8c0d0beb 100644
--- a/src/Query/QueryModifierCollection.php
+++ b/src/Query/QueryModifierCollection.php
@@ -15,7 +15,6 @@
 namespace Happyr\DoctrineSpecification\Query;
 
 use Doctrine\ORM\QueryBuilder;
-use Happyr\DoctrineSpecification\Exception\InvalidArgumentException;
 
 final class QueryModifierCollection implements QueryModifier
 {
@@ -41,14 +40,6 @@ public function __construct(...$children)
     public function modify(QueryBuilder $qb, string $context): void
     {
         foreach ($this->children as $child) {
-            if (!$child instanceof QueryModifier) {
-                throw new InvalidArgumentException(sprintf(
-                    'Child passed to QueryModifierCollection must be an instance of %s, but instance of %s found',
-                    QueryModifier::class,
-                    get_class($child)
-                ));
-            }
-
             $child->modify($qb, $context);
         }
     }
diff --git a/src/Result/ResultModifierCollection.php b/src/Result/ResultModifierCollection.php
index 5479ca94..4f587167 100644
--- a/src/Result/ResultModifierCollection.php
+++ b/src/Result/ResultModifierCollection.php
@@ -15,7 +15,6 @@
 namespace Happyr\DoctrineSpecification\Result;
 
 use Doctrine\ORM\AbstractQuery;
-use Happyr\DoctrineSpecification\Exception\InvalidArgumentException;
 
 final class ResultModifierCollection implements ResultModifier
 {
@@ -40,14 +39,6 @@ public function __construct(...$children)
     public function modify(AbstractQuery $query): void
     {
         foreach ($this->children as $child) {
-            if (!$child instanceof ResultModifier) {
-                throw new InvalidArgumentException(sprintf(
-                    'Child passed to ResultModifierCollection must be an instance of %s, but instance of %s found',
-                    ResultModifier::class,
-                    get_class($child)
-                ));
-            }
-
             $child->modify($query);
         }
     }