diff --git a/config/environments/development.rb b/config/environments/development.rb
index 75243c3d..b58052ca 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -73,6 +73,9 @@
   # Raise error when a before_action's only/except options reference missing actions.
   config.action_controller.raise_on_missing_callback_actions = true
 
+  # Allow ngrok tunnels for local development.
+  config.hosts << /.*\.blockcloud\.ngrok\.app/
+
   # Apply autocorrection by RuboCop to files generated by `bin/rails generate`.
   # config.generators.apply_rubocop_autocorrect_after_generate!
 end