diff --git a/Demo/Program.cs b/Demo/Program.cs
index 9ebb621..6f076fd 100644
--- a/Demo/Program.cs
+++ b/Demo/Program.cs
@@ -6,5 +6,6 @@ using Demo.UI;
 GroupRepositoryImpl groupRepositoryImpl = new GroupRepositoryImpl();
 UserRepositoryImpl userRepositoryImpl = new UserRepositoryImpl();
 UserUseCase userUseCase = new UserUseCase(userRepositoryImpl, groupRepositoryImpl);
+GroupUseCase groupUseCase = new GroupUseCase(groupRepositoryImpl);
 
-MainMenuUI mainMenuUI = new MainMenuUI(userUseCase);
\ No newline at end of file
+MainMenuUI mainMenuUI = new MainMenuUI(userUseCase, groupUseCase);
\ No newline at end of file