diff --git a/lib/kangaru/application.rb b/lib/kangaru/application.rb
index d1e0445..c753616 100644
--- a/lib/kangaru/application.rb
+++ b/lib/kangaru/application.rb
@@ -29,7 +29,7 @@ def run!(argv)
     def autoloader
       @autoloader ||= Zeitwerk::Loader.new.tap do |loader|
         loader.inflector = Zeitwerk::GemInflector.new(root_file)
-        loader.push_dir(app_dir)
+        loader.push_dir(app_dir, namespace:)
       end
     end
   end
diff --git a/sig/zeitwerk/loader.rbs b/sig/zeitwerk/loader.rbs
index 953a25e..9079d8e 100755
--- a/sig/zeitwerk/loader.rbs
+++ b/sig/zeitwerk/loader.rbs
@@ -6,7 +6,7 @@ module Zeitwerk
 
     def collapse: (Array[String]) -> void
 
-    def push_dir: (String dir) -> void
+    def push_dir: (String dir, ?namespace: Module) -> void
 
     def setup: -> void
   end
diff --git a/spec/kangaru/application_spec.rb b/spec/kangaru/application_spec.rb
index eeca991..3d31142 100644
--- a/spec/kangaru/application_spec.rb
+++ b/spec/kangaru/application_spec.rb
@@ -47,7 +47,11 @@
 
     it "configures the loader to load the app dir" do
       setup
-      expect(loader).to have_received(:push_dir).with(application.app_dir).once
+
+      expect(loader)
+        .to have_received(:push_dir)
+        .with(application.app_dir, namespace:)
+        .once
     end
 
     it "enables the instantiated loader" do