diff --git a/Gemfile.lock b/Gemfile.lock
index d8b1eab9..e1f620df 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -252,4 +252,4 @@ DEPENDENCIES
   rubocop-packaging
 
 BUNDLED WITH
-   2.3.3
+   2.3.6
diff --git a/lib/arbre/rails/forms.rb b/lib/arbre/rails/forms.rb
index a985c939..9be9af77 100644
--- a/lib/arbre/rails/forms.rb
+++ b/lib/arbre/rails/forms.rb
@@ -31,7 +31,7 @@ def proxy_call_to_form(method, *args, &block)
           text_node form_builder.send(method, *args, &block)
         end
 
-        def method_missing(method, *args, &block)
+        ruby2_keywords def method_missing(method, *args, &block)
           if form_builder && form_builder.respond_to?(method)
             proxy_call_to_form(method, *args, &block)
           else