diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 57994f9c..25318c07 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,17 +11,26 @@ permissions:
 
 jobs:
   tests:
-    name: "PHP ${{ matrix.php }} + Doctrine ORM ${{ matrix.doctrine-orm }}"
+    name: "PHP ${{ matrix.php }} + Doctrine ORM ${{ matrix.doctrine-orm }} + Doctrine Lexer ${{ matrix.doctrine-lexer }}"
     runs-on: ubuntu-latest
 
     strategy:
       fail-fast: false
       matrix:
         php: ['8.1', '8.2', '8.3', '8.4']
-        doctrine-orm: ['2.14', '3.0', 'latest']
+        doctrine-lexer: ['2.1', '3.0', 'latest']
+        doctrine-orm: ['2.14', '2.18', '3.0', 'latest']
         include:
+          - php: '8.1'
+            doctrine-orm: '2.14'
+            doctrine-lexer: '1.2'
           - php: '8.4'
             calculate-code-coverage: true
+        exclude:
+          - doctrine-orm: '2.14'
+            doctrine-lexer: '3.0'
+          - doctrine-orm: '3.0'
+            doctrine-lexer: '2.1'
 
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
@@ -46,12 +55,26 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-php-
 
-    - name: Install composer dependencies
+    - name: Install Doctrine Lexer dependency
+      run: |
+        if [ "${{ matrix.doctrine-lexer }}" == "1.2" ]; then
+          composer require doctrine/lexer "~1.2" --dev --prefer-dist --no-interaction --no-progress
+        elif [ "${{ matrix.doctrine-lexer }}" == "2.1" ]; then
+          composer require doctrine/lexer "~2.1" --dev --prefer-dist --no-interaction --no-progress
+        elif [ "${{ matrix.doctrine-lexer }}" == "3.0" ]; then
+          composer require doctrine/lexer "~3.0" --dev --prefer-dist --no-interaction --no-progress
+        else
+          composer update --prefer-dist --no-interaction --no-progress
+        fi
+
+    - name: Install Doctrine ORM dependency
       run: |
         if [ "${{ matrix.doctrine-orm }}" == "2.14" ]; then
-          composer require doctrine/orm "~2.14" --prefer-dist --no-interaction --no-progress
+          composer require doctrine/orm "~2.14" --prefer-dist --no-interaction --no-progress --with-all-dependencies
+        elif [ "${{ matrix.doctrine-orm }}" == "2.18" ]; then
+          composer require doctrine/orm "~2.18" --prefer-dist --no-interaction --no-progress --with-all-dependencies
         elif [ "${{ matrix.doctrine-orm }}" == "3.0" ]; then
-          composer require doctrine/orm "~3.0" --prefer-dist --no-interaction --no-progress
+          composer require doctrine/orm "~3.0" --prefer-dist --no-interaction --no-progress --with-all-dependencies
         else
           composer update --prefer-dist --no-interaction --no-progress
         fi
diff --git a/ci/phpstan/baselines/lexer-constants.neon b/ci/phpstan/baselines/lexer-variations.neon
similarity index 58%
rename from ci/phpstan/baselines/lexer-constants.neon
rename to ci/phpstan/baselines/lexer-variations.neon
index 943744fd..de961a18 100644
--- a/ci/phpstan/baselines/lexer-constants.neon
+++ b/ci/phpstan/baselines/lexer-variations.neon
@@ -11,3 +11,7 @@ parameters:
         - '#Fetching deprecated class constant T_DISTINCT of class Doctrine\\ORM\\Query\\Lexer#'
         - '#Parameter \#1 \$token of method Doctrine\\ORM\\Query\\Parser::match\(\) expects Doctrine\\ORM\\Query\\TokenType, mixed given.#'
         - '#Parameter \#1 \$type of method Doctrine\\Common\\Lexer\\AbstractLexer<Doctrine\\ORM\\Query\\TokenType,string>::isNextToken\(\) expects Doctrine\\ORM\\Query\\TokenType, mixed given.#'
+        - '#Parameter \#1 \$token of method Doctrine\\ORM\\Query\\Parser::match\(\) expects int\|string, mixed given.#'
+        - '#Parameter \#1 \$type of method Doctrine\\Common\\Lexer\\AbstractLexer<int\|string,string>::isNextToken\(\) expects int\|string, mixed given.#'
+        - '#Parameter \#1 \$token of method Doctrine\\ORM\\Query\\Parser::match\(\) expects 1\|2\|3\|4\|5\|6\|7\|8\|9\|10\|11\|12\|13\|14\|15\|16\|17\|18\|19\|100\|101\|102\|200\|201\|202\|203\|204\|205\|206\|207\|208\|209\|210\|211\|212\|213\|214\|215\|216\|217\|218\|219\|220\|221\|222\|223\|224\|225\|226\|227\|228\|229\|230\|231\|232\|233\|234\|235\|236\|237\|238\|239\|240\|241\|242\|243\|244\|245\|246\|247\|248\|249\|250\|251\|252\|253\|254\|255\|256, mixed given.#'
+        - '#Parameter \#1 \$type of method Doctrine\\Common\\Lexer\\AbstractLexer::isNextToken\(\) expects int\|string, mixed given.#'
diff --git a/ci/phpstan/config.neon b/ci/phpstan/config.neon
index 22d0a60e..1c0d0f1f 100644
--- a/ci/phpstan/config.neon
+++ b/ci/phpstan/config.neon
@@ -4,7 +4,7 @@ includes:
     - ../../vendor/phpstan/phpstan-doctrine/extension.neon
     - ../../vendor/phpstan/phpstan-phpunit/extension.neon
     - ./baselines/deprecated-methods.neon
-    - ./baselines/lexer-constants.neon
+    - ./baselines/lexer-variations.neon
     - ./baselines/phpstan-identifiers.neon
     - ./baselines/type-mismatches.neon
 
diff --git a/ci/rector/config.php b/ci/rector/config.php
index f29b9a46..bec08cfc 100644
--- a/ci/rector/config.php
+++ b/ci/rector/config.php
@@ -2,6 +2,7 @@
 
 declare(strict_types=1);
 
+use Rector\CodeQuality\Rector\Identical\FlipTypeControlToUseExclusiveTypeRector;
 use Rector\Config\RectorConfig;
 use Rector\Doctrine\Set\DoctrineSetList;
 use Rector\Naming\Rector\Class_\RenamePropertyToMatchTypeRector;
@@ -40,6 +41,9 @@
 
     $rectorConfig->skip([
         RenamePropertyToMatchTypeRector::class,
+        FlipTypeControlToUseExclusiveTypeRector::class => [
+            $basePath.'src/MartinGeorgiev/Utils/DoctrineLexer.php',
+        ],
     ]);
 
     $rectorConfig->importShortClasses(false);
diff --git a/src/MartinGeorgiev/Doctrine/ORM/Query/AST/Functions/BaseVariadicFunction.php b/src/MartinGeorgiev/Doctrine/ORM/Query/AST/Functions/BaseVariadicFunction.php
index df2a08ba..8a08b319 100644
--- a/src/MartinGeorgiev/Doctrine/ORM/Query/AST/Functions/BaseVariadicFunction.php
+++ b/src/MartinGeorgiev/Doctrine/ORM/Query/AST/Functions/BaseVariadicFunction.php
@@ -11,6 +11,7 @@
 use Doctrine\ORM\Query\TokenType;
 use MartinGeorgiev\Doctrine\ORM\Query\AST\Functions\Exception\InvalidArgumentForVariadicFunctionException;
 use MartinGeorgiev\Doctrine\ORM\Query\AST\Functions\Exception\ParserException;
+use MartinGeorgiev\Utils\DoctrineLexer;
 use MartinGeorgiev\Utils\DoctrineOrm;
 
 /**
@@ -30,24 +31,24 @@ protected function feedParserWithNodes(Parser $parser): void
         try {
             // @phpstan-ignore-next-line
             $this->nodes[] = $parser->{$this->commonNodeMapping}();
-            if ($lexer->lookahead?->type === null) {
+            $lookaheadType = DoctrineLexer::getLookaheadType($lexer);
+            if ($lookaheadType === null) {
                 throw ParserException::missingLookaheadType();
             }
         } catch (\Throwable $throwable) {
             throw ParserException::withThrowable($throwable);
         }
 
-        $aheadType = $lexer->lookahead->type;
         $shouldUseLexer = DoctrineOrm::isPre219();
 
-        while (($shouldUseLexer ? Lexer::T_CLOSE_PARENTHESIS : TokenType::T_CLOSE_PARENTHESIS) !== $aheadType) {
-            if (($shouldUseLexer ? Lexer::T_COMMA : TokenType::T_COMMA) === $aheadType) {
+        while (($shouldUseLexer ? Lexer::T_CLOSE_PARENTHESIS : TokenType::T_CLOSE_PARENTHESIS) !== $lookaheadType) {
+            if (($shouldUseLexer ? Lexer::T_COMMA : TokenType::T_COMMA) === $lookaheadType) {
                 $parser->match($shouldUseLexer ? Lexer::T_COMMA : TokenType::T_COMMA);
                 // @phpstan-ignore-next-line
                 $this->nodes[] = $parser->{$this->commonNodeMapping}();
             }
 
-            $aheadType = $lexer->lookahead->type;
+            $lookaheadType = DoctrineLexer::getLookaheadType($lexer);
         }
 
         $this->validateArguments($this->nodes);
diff --git a/src/MartinGeorgiev/Doctrine/ORM/Query/AST/Functions/Cast.php b/src/MartinGeorgiev/Doctrine/ORM/Query/AST/Functions/Cast.php
index 2b2f7d62..c1fab78a 100644
--- a/src/MartinGeorgiev/Doctrine/ORM/Query/AST/Functions/Cast.php
+++ b/src/MartinGeorgiev/Doctrine/ORM/Query/AST/Functions/Cast.php
@@ -4,13 +4,13 @@
 
 namespace MartinGeorgiev\Doctrine\ORM\Query\AST\Functions;
 
-use Doctrine\Common\Lexer\Token;
 use Doctrine\ORM\Query\AST\Functions\FunctionNode;
 use Doctrine\ORM\Query\AST\Node;
 use Doctrine\ORM\Query\Lexer;
 use Doctrine\ORM\Query\Parser;
 use Doctrine\ORM\Query\SqlWalker;
 use Doctrine\ORM\Query\TokenType;
+use MartinGeorgiev\Utils\DoctrineLexer;
 use MartinGeorgiev\Utils\DoctrineOrm;
 
 /**
@@ -40,16 +40,11 @@ public function parse(Parser $parser): void
         $parser->match($shouldUseLexer ? Lexer::T_IDENTIFIER : TokenType::T_IDENTIFIER);
 
         $lexer = $parser->getLexer();
-        $token = $lexer->token;
-        if (!$token instanceof Token) {
+        $type = DoctrineLexer::getTokenValue($lexer);
+        if (!\is_string($type)) {
             return;
         }
 
-        if (!\is_string($token->value)) {
-            return;
-        }
-
-        $type = $token->value;
         if ($lexer->isNextToken($shouldUseLexer ? Lexer::T_OPEN_PARENTHESIS : TokenType::T_OPEN_PARENTHESIS)) {
             $parser->match($shouldUseLexer ? Lexer::T_OPEN_PARENTHESIS : TokenType::T_OPEN_PARENTHESIS);
             $parameter = $parser->Literal();
diff --git a/src/MartinGeorgiev/Utils/DoctrineLexer.php b/src/MartinGeorgiev/Utils/DoctrineLexer.php
new file mode 100644
index 00000000..1abc5499
--- /dev/null
+++ b/src/MartinGeorgiev/Utils/DoctrineLexer.php
@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MartinGeorgiev\Utils;
+
+use Doctrine\ORM\Query\Lexer;
+
+/**
+ * @internal
+ */
+final class DoctrineLexer
+{
+    /**
+     * Checks if the Lexer is prior to version 2.0.0.
+     *
+     * In Lexer versions prior to 2.0.0, the lookahead property is an array,
+     * while in 2.0.0+ it's an object.
+     */
+    public static function isPre200(Lexer $lexer): bool
+    {
+        // @phpstan-ignore-next-line
+        return \is_array($lexer->lookahead);
+    }
+
+    /**
+     * @return mixed|null
+     */
+    public static function getLookaheadType(Lexer $lexer)
+    {
+        if (self::isPre200($lexer)) {
+            // @phpstan-ignore-next-line
+            return $lexer->lookahead['type'];
+        }
+
+        // @phpstan-ignore-next-line
+        return $lexer->lookahead?->type;
+    }
+
+    /**
+     * @return mixed|null
+     */
+    public static function getTokenValue(Lexer $lexer)
+    {
+        if (self::isPre200($lexer)) {
+            // @phpstan-ignore-next-line
+            if ($lexer->token === null) {
+                return null;
+            }
+
+            // @phpstan-ignore-next-line
+            return $lexer->token['value'];
+        }
+
+        // @phpstan-ignore-next-line
+        return $lexer->token?->value;
+    }
+}