diff --git a/stubs/Runtime.stub b/stubs/Runtime.stub
index 5abb4c2..a6ebf5e 100644
--- a/stubs/Runtime.stub
+++ b/stubs/Runtime.stub
@@ -33,10 +33,29 @@ final class Runtime
     /* Execute */
 
     /**
-     * @param (Closure():T)|(Closure():void) $task
-     * @param array<mixed>                   $argv
+     * @param (Closure():T)|(Closure(A0):T)|(Closure(A0,A1):T)|(Closure(A0,A1,A2):T)|(Closure(A0,A1,A2,A3):T)|(Closure(A0,A1,A2,A3,A4):T)|(Closure():void)|(Closure(A0):void)|(Closure(A0,A1):void)|(Closure(A0,A1,A2):void)|(Closure(A0,A1,A2,A3):void)|(Closure(A0,A1,A2,A3,A4):void) $task
+     * @param array{}|array{A0}|array{A0,A1}|array{A0,A1,A2}|array{A0,A1,A2,A3}|array{A0,A1,A2,A3,A4}                                                                                                                                                                                   $argv
+     *
+     * @return (
+     *      $task is (Closure():T) ? Future<T> : (
+     *          $task is (Closure(A0):T) ? Future<T> : (
+     *              $task is (Closure(A0,A1):T) ? Future<T> : (
+     *                  $task is (Closure(A0,A1,A2):T) ? Future<T> : (
+     *                      $task is (Closure(A0,A1,A2,A3):T) ? Future<T> : (
+     *                          $task is (Closure(A0,A1,A2,A3,A4):T) ? Future<T> : null
+     *                      )
+     *                  )
+     *              )
+     *          )
+     *      )
+     * )
+     *
      * @template T
-     * @return ($task is (Closure():T) ? Future<T> : null)
+     * @template A0 (any number of function arguments, see https://github.com/phpstan/phpstan/issues/8214)
+     * @template A1
+     * @template A2
+     * @template A3
+     * @template A4
      *
      * @throws Runtime\Error\Closed if \parallel\Runtime was closed.
      * @throws Runtime\Error\IllegalFunction if task is a closure created from an internal function.