diff --git a/src/MoneyServiceProvider.php b/src/MoneyServiceProvider.php
index f5efa44..a45ec91 100644
--- a/src/MoneyServiceProvider.php
+++ b/src/MoneyServiceProvider.php
@@ -27,7 +27,7 @@ class MoneyServiceProvider extends ServiceProvider
 
     }
 
-    public function boot()
+    public function boot(): void
     {
         $this->publishes([
             __DIR__ . '/../config/config.php' => config_path('money.php'),