diff --git a/spec/dummy/application.rb b/spec/dummy/application.rb
index fd14a1e3..b2e64db7 100644
--- a/spec/dummy/application.rb
+++ b/spec/dummy/application.rb
@@ -33,7 +33,9 @@ class Application < Rails::Application
     config.secret_token = "SECRET_TOKEN_IS_MIN_30_CHARS_LONG"
     config.secret_key_base = "SECRET_KEY_BASE"
 
-    config.active_support.to_time_preserves_timezone = :zone
+    if Rails.gem_version < Gem::Version.new("8.1")
+      config.active_support.to_time_preserves_timezone = :zone
+    end
 
     def require_environment!
       initialize!
diff --git a/spec/dummy/config/initializers/high_voltage.rb b/spec/dummy/config/initializers/high_voltage.rb
index 5c1fc242..97bb9df1 100644
--- a/spec/dummy/config/initializers/high_voltage.rb
+++ b/spec/dummy/config/initializers/high_voltage.rb
@@ -2,4 +2,5 @@
 
 HighVoltage.configure do |config|
   config.layout = false
+  config.routes = false
 end