diff -Nur a/spec/unit/shoulda/matchers/active_record/have_db_index_matcher_spec.rb b/spec/unit/shoulda/matchers/active_record/have_db_index_matcher_spec.rb
--- a/spec/unit/shoulda/matchers/active_record/have_db_index_matcher_spec.rb	2022-03-02 19:06:24.099019714 +0800
+++ b/spec/unit/shoulda/matchers/active_record/have_db_index_matcher_spec.rb	2022-03-02 19:25:43.998524568 +0800
@@ -79,7 +79,7 @@
   def with_index_on(column_name, index_options = {})
     create_table 'employees' do |table|
       table.integer column_name
-    end.add_index(:employees, column_name, index_options)
+    end.add_index(:employees, column_name, **index_options)
     define_model_class('Employee').new
   end
 end