diff --git a/config/application.rb b/config/application.rb
index e1f1b95485..07a5515c2c 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -24,7 +24,7 @@
 module Alaveteli
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 7.2
+    config.load_defaults 8.0
 
     # Disable new framework default has_many_inversing breaks some specs due to
     # an apparent regression in Rails
diff --git a/config/initializers/new_framework_defaults_8_0.rb b/config/initializers/new_framework_defaults_8_0.rb
deleted file mode 100644
index 92efa95152..0000000000
--- a/config/initializers/new_framework_defaults_8_0.rb
+++ /dev/null
@@ -1,30 +0,0 @@
-# Be sure to restart your server when you modify this file.
-#
-# This file eases your Rails 8.0 framework defaults upgrade.
-#
-# Uncomment each configuration one by one to switch to the new default.
-# Once your application is ready to run with all new defaults, you can remove
-# this file and set the `config.load_defaults` to `8.0`.
-#
-# Read the Guide for Upgrading Ruby on Rails for more info on each option.
-# https://guides.rubyonrails.org/upgrading_ruby_on_rails.html
-
-###
-# Specifies whether `to_time` methods preserve the UTC offset of their receivers or preserves the timezone.
-# If set to `:zone`, `to_time` methods will use the timezone of their receivers.
-# If set to `:offset`, `to_time` methods will use the UTC offset.
-# If `false`, `to_time` methods will convert to the local system UTC offset instead.
-#++
-# Rails.application.config.active_support.to_time_preserves_timezone = :zone
-
-###
-# When both `If-Modified-Since` and `If-None-Match` are provided by the client
-# only consider `If-None-Match` as specified by RFC 7232 Section 6.
-# If set to `false` both conditions need to be satisfied.
-#++
-# Rails.application.config.action_dispatch.strict_freshness = true
-
-###
-# Set `Regexp.timeout` to `1`s by default to improve security over Regexp Denial-of-Service attacks.
-#++
-# Regexp.timeout = 1
diff --git a/config/initializers/to_time_preserves_timezone.rb b/config/initializers/to_time_preserves_timezone.rb
deleted file mode 100644
index 8674be3227..0000000000
--- a/config/initializers/to_time_preserves_timezone.rb
+++ /dev/null
@@ -1,10 +0,0 @@
-# Be sure to restart your server when you modify this file.
-
-# Preserve the timezone of the receiver when calling to `to_time`.
-# Ruby 2.4 will change the behavior of `to_time` to preserve the timezone
-# when converting to an instance of `Time` instead of the previous behavior
-# of converting to the local system timezone.
-#
-# Rails 5.0 introduced this config option so that apps made with earlier
-# versions of Rails are not affected when upgrading.
-ActiveSupport.to_time_preserves_timezone = true