diff --git a/config/environments/test.rb b/config/environments/test.rb
index 857297d..7325b16 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -58,4 +58,7 @@ Rails.application.configure do
   # config.action_view.annotate_rendered_view_with_filenames = true
 
   config.log_level = :info
+
+  # Allow Capybara's dynamic test server host (127.0.0.1:<random_port>)
+  config.hosts << '127.0.0.1'
 end