diff --git a/src/Contract/Operation/GroupByable.php b/src/Contract/Operation/GroupByable.php
index 15488b5c..ff6a4c08 100644
--- a/src/Contract/Operation/GroupByable.php
+++ b/src/Contract/Operation/GroupByable.php
@@ -4,7 +4,6 @@
 
 namespace loophp\collection\Contract\Operation;
 
-use Closure;
 use loophp\collection\Contract\Collection;
 
 /**
@@ -21,9 +20,9 @@ interface GroupByable
      *
      * @see https://loophp-collection.readthedocs.io/en/stable/pages/api.html#groupby
      *
-     * @param Closure(T, TKey): array-key $callback
+     * @param callable(T, TKey): array-key $callback
      *
      * @return Collection<array-key, non-empty-list<T>>
      */
-    public function groupBy(Closure $callback): Collection;
+    public function groupBy(callable $callback): Collection;
 }
diff --git a/src/Operation/GroupBy.php b/src/Operation/GroupBy.php
index 4d782a8d..c49207f3 100644
--- a/src/Operation/GroupBy.php
+++ b/src/Operation/GroupBy.php
@@ -16,7 +16,7 @@
 final class GroupBy extends AbstractOperation
 {
     /**
-     * @return Closure(Closure(T, TKey): array-key): Closure(iterable<TKey, T>): Generator<array-key, non-empty-list<T>>
+     * @return Closure(callable(T, TKey): array-key): Closure(iterable<TKey, T>): Generator<array-key, non-empty-list<T>>
      */
     public function __invoke(): Closure
     {