diff --git a/composer.json b/composer.json
index e8be65a..911e110 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "webonyx/graphql-php": "^14.0"
     },
     "require-dev": {
-        "doctrine/coding-standard": "^8.2",
+        "doctrine/coding-standard": "^9.0",
         "infection/infection": "^0.23.0",
         "phpstan/extension-installer": "^1.1",
         "phpstan/phpstan": "0.12.90",
diff --git a/src/Exception/InvalidArgument.php b/src/Exception/InvalidArgument.php
index ca13ab4..ff5fe9f 100644
--- a/src/Exception/InvalidArgument.php
+++ b/src/Exception/InvalidArgument.php
@@ -23,9 +23,7 @@ public static function invalidNameFormat(string $invalidName): self
         return new self(sprintf('Name "%s" does not match pattern "%s"', $invalidName, TypeBuilder::VALID_NAME_PATTERN));
     }
 
-    /**
-     * @param mixed $invalidValue
-     */
+    /** @param mixed $invalidValue */
     public static function valueNotIso8601Compliant($invalidValue): self
     {
         return new self(sprintf('DateTime type expects input value to be ISO 8601 compliant. Given invalid value "%s"', (string) $invalidValue));
diff --git a/src/Type/DateTimeType.php b/src/Type/DateTimeType.php
index 8c202fb..3deff47 100644
--- a/src/Type/DateTimeType.php
+++ b/src/Type/DateTimeType.php
@@ -48,9 +48,7 @@ public function __construct()
         );
     }
 
-    /**
-     * @param mixed $value
-     */
+    /** @param mixed $value */
     public function serialize($value): string
     {
         if (! $value instanceof DateTimeInterface) {
@@ -62,9 +60,7 @@ public function serialize($value): string
         return $value->format(DateTimeInterface::ATOM);
     }
 
-    /**
-     * @param mixed $value
-     */
+    /** @param mixed $value */
     public function parseValue($value): DateTimeImmutable
     {
         if (! is_string($value)) {
@@ -78,11 +74,7 @@ public function parseValue($value): DateTimeImmutable
         return new DateTimeImmutable($value);
     }
 
-    /**
-     * @param mixed[]|null $variables
-     *
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
-     */
+    /** @param mixed[]|null $variables */
     public function parseLiteral(Node $valueNode, ?array $variables = null): ?DateTimeImmutable
     {
         if (! $valueNode instanceof StringValueNode) {