diff --git a/app/controllers/pseuds_controller.rb b/app/controllers/pseuds_controller.rb
index 77265c9cca7..f71c4ddf8e3 100644
--- a/app/controllers/pseuds_controller.rb
+++ b/app/controllers/pseuds_controller.rb
@@ -91,7 +91,7 @@ def create
           # if setting this one as default, unset the attribute of the current default pseud
           old_default.update_attribute(:is_default, false)
         end
-        redirect_to([@user, @pseud])
+        redirect_to polymorphic_path([@user, @pseud])
       else
         render action: "new"
       end
diff --git a/config/application.rb b/config/application.rb
index 992db9c0a25..318f40bc5fc 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -17,7 +17,7 @@ class Application < Rails::Application
     # These settings can be overridden in specific environments using the files
     # in config/environments, which are processed later.
 
-    config.load_defaults 6.1
+    config.load_defaults 7.0
 
     # TODO: Remove in Rails 7.1, where it's false by default.
     config.add_autoload_paths_to_load_path = false
diff --git a/config/initializers/cookie_rotator.rb b/config/initializers/cookie_rotator.rb
deleted file mode 100644
index 1ca6f61d529..00000000000
--- a/config/initializers/cookie_rotator.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-# frozen_string_literal: true
-
-# As part of the Rails 7 upgrade, we need to convert legacy (SHA1) cookies to SHA256.
-# This can be removed after it has been in production for a little bit.
-# Ref: https://guides.rubyonrails.org/upgrading_ruby_on_rails.html#key-generator-digest-class-change-requires-a-cookie-rotator
-Rails.application.config.after_initialize do
-  Rails.application.config.action_dispatch.cookies_rotations.tap do |cookies|
-    authenticated_encrypted_cookie_salt = Rails.application.config.action_dispatch.authenticated_encrypted_cookie_salt
-    signed_cookie_salt = Rails.application.config.action_dispatch.signed_cookie_salt
-
-    secret_key_base = Rails.application.secret_key_base
-
-    key_generator = ActiveSupport::KeyGenerator.new(
-      secret_key_base, iterations: 1000, hash_digest_class: OpenSSL::Digest::SHA1
-    )
-    key_len = ActiveSupport::MessageEncryptor.key_len
-
-    old_encrypted_secret = key_generator.generate_key(authenticated_encrypted_cookie_salt, key_len)
-    old_signed_secret = key_generator.generate_key(signed_cookie_salt)
-
-    cookies.rotate :encrypted, old_encrypted_secret
-    cookies.rotate :signed, old_signed_secret
-  end
-end
diff --git a/config/initializers/cookies_serializer.rb b/config/initializers/cookies_serializer.rb
deleted file mode 100644
index f51a497e118..00000000000
--- a/config/initializers/cookies_serializer.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-# Be sure to restart your server when you modify this file.
-
-# Specify a serializer for the signed and encrypted cookie jars.
-# Valid options are :json, :marshal, and :hybrid.
-Rails.application.config.action_dispatch.cookies_serializer = :hybrid
diff --git a/config/initializers/new_framework_defaults_7_0.rb b/config/initializers/new_framework_defaults_7_0.rb
deleted file mode 100644
index aa327f1102f..00000000000
--- a/config/initializers/new_framework_defaults_7_0.rb
+++ /dev/null
@@ -1,110 +0,0 @@
-# Be sure to restart your server when you modify this file.
-#
-# This file eases your Rails 7.0 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 `7.0`.
-#
-# Read the Guide for Upgrading Ruby on Rails for more info on each option.
-# https://guides.rubyonrails.org/upgrading_ruby_on_rails.html
-
-# `button_to` view helper will render `<button>` element, regardless of whether
-# or not the content is passed as the first argument or as a block.
-# Rails.application.config.action_view.button_to_generates_button_tag = true
-
-# `stylesheet_link_tag` view helper will not render the media attribute by default.
-Rails.application.config.action_view.apply_stylesheet_media_default = false
-
-# Change the digest class for the key generators to `OpenSSL::Digest::SHA256`.
-# Changing this default means invalidate all encrypted messages generated by
-# your application and, all the encrypted cookies. Only change this after you
-# rotated all the messages using the key rotator.
-#
-# See upgrading guide for more information on how to build a rotator.
-# https://guides.rubyonrails.org/v7.0/upgrading_ruby_on_rails.html
-# Rails.application.config.active_support.key_generator_hash_digest_class = OpenSSL::Digest::SHA256
-
-# Change the digest class for ActiveSupport::Digest.
-# Changing this default means that for example Etags change and
-# various cache keys leading to cache invalidation.
-Rails.application.config.active_support.hash_digest_class = OpenSSL::Digest::SHA256
-
-# Don't override ActiveSupport::TimeWithZone.name and use the default Ruby
-# implementation.
-Rails.application.config.active_support.remove_deprecated_time_with_zone_name = true
-
-# Calls `Rails.application.executor.wrap` around test cases.
-# This makes test cases behave closer to an actual request or job.
-# Several features that are normally disabled in test, such as Active Record query cache
-# and asynchronous queries will then be enabled.
-Rails.application.config.active_support.executor_around_test_case = true
-
-# Set both the `:open_timeout` and `:read_timeout` values for `:smtp` delivery method.
-Rails.application.config.action_mailer.smtp_timeout = 5
-
-# The ActiveStorage video previewer will now use scene change detection to generate
-# better preview images (rather than the previous default of using the first frame
-# of the video).
-Rails.application.config.active_storage.video_preview_arguments = "-vf 'select=eq(n\\,0)+eq(key\\,1)+gt(scene\\,0.015),loop=loop=-1:size=2,trim=start_frame=1' -frames:v 1 -f image2"
-
-# Automatically infer `inverse_of` for associations with a scope.
-Rails.application.config.active_record.automatic_scope_inversing = true
-
-# Raise when running tests if fixtures contained foreign key violations
-Rails.application.config.active_record.verify_foreign_keys_for_fixtures = true
-
-# Disable partial inserts.
-# This default means that all columns will be referenced in INSERT queries
-# regardless of whether they have a default or not.
-Rails.application.config.active_record.partial_inserts = false
-
-# Protect from open redirect attacks in `redirect_back_or_to` and `redirect_to`.
-# Rails.application.config.action_controller.raise_on_open_redirects = true
-
-# Change the variant processor for Active Storage.
-# Changing this default means updating all places in your code that
-# generate variants to use image processing macros and ruby-vips
-# operations. See the upgrading guide for detail on the changes required.
-# The `:mini_magick` option is not deprecated; it's fine to keep using it.
-Rails.application.config.active_storage.variant_processor = :vips
-
-# Enable parameter wrapping for JSON.
-# Previously this was set in an initializer. It's fine to keep using that initializer if you've customized it.
-# To disable parameter wrapping entirely, set this config to `false`.
-Rails.application.config.action_controller.wrap_parameters_by_default = true
-
-# Specifies whether generated namespaced UUIDs follow the RFC 4122 standard for namespace IDs provided as a
-# `String` to `Digest::UUID.uuid_v3` or `Digest::UUID.uuid_v5` method calls.
-#
-# See https://guides.rubyonrails.org/configuring.html#config-active-support-use-rfc4122-namespaced-uuids for
-# more information.
-Rails.application.config.active_support.use_rfc4122_namespaced_uuids = true
-
-# ** Please read carefully, this must be configured in config/application.rb **
-# Change the format of the cache entry.
-# Changing this default means that all new cache entries added to the cache
-# will have a different format that is not supported by Rails 6.1 applications.
-# Only change this value after your application is fully deployed to Rails 7.0
-# and you have no plans to rollback.
-# When you're ready to change format, add this to `config/application.rb` (NOT this file):
-#  config.active_support.cache_format_version = 7.0
-
-# Cookie serializer: 2 options
-#
-# If you're upgrading and haven't set `cookies_serializer` previously, your cookie serializer
-# is `:marshal`. The default for new apps is `:json`.
-#
-# Rails.application.config.action_dispatch.cookies_serializer = :json
-#
-#
-# NOTE: as of https://github.com/otwcode/otwarchive/pull/4651, we are using :hybrid, which is the first step to migrate.
-# After some time, we can update to use :json instead.
-
-# Change the return value of `ActionDispatch::Request#content_type` to the Content-Type header without modification.
-Rails.application.config.action_dispatch.return_only_request_media_type_on_content_type = false
-
-# Active Storage `has_many_attached` relationships will default to replacing the current collection instead of appending to it.
-# Thus, to support submitting an empty collection, the `file_field` helper will render an hidden field `include_hidden` by default when `multiple_file_field_include_hidden` is set to `true`.
-# See https://guides.rubyonrails.org/configuring.html#config-active-storage-multiple-file-field-include-hidden for more information.
-Rails.application.config.active_storage.multiple_file_field_include_hidden = true
diff --git a/features/collections/collection_participants.feature b/features/collections/collection_participants.feature
index 868faa442a1..b9e7c23685e 100644
--- a/features/collections/collection_participants.feature
+++ b/features/collections/collection_participants.feature
@@ -18,9 +18,9 @@
     And I press "Submit"
   Then I should see "New members invited: sam"
   When I select "Owner" from "sam_role"
-     And I submit with the 5th button
+     And I submit with the 4th button
   Then I should see "Updated sam."
-  When I submit with the 6th button
+  When I click the 2nd button
   Then I should see "Removed sam from collection."
 
   Scenario: Owner can't invite a nonexistent user to the collection
@@ -60,7 +60,7 @@
     And I press "Submit"
   Then I should see "New members invited: sam"
   When I select "Invited" from "sam_role"
-    And I submit with the 5th button
+    And I submit with the 4th button
   Then I should see "Updated sam."
   When I am in sam's browser
     And I follow "Join"
diff --git a/features/other_a/pseud_delete.feature b/features/other_a/pseud_delete.feature
index 541695b5926..14e3ffafca2 100644
--- a/features/other_a/pseud_delete.feature
+++ b/features/other_a/pseud_delete.feature
@@ -186,7 +186,7 @@ Feature: Delete pseud.
       And I press "Submit"
     Then I should see "New members invited: other_pseud (myself)"
     When I select "Moderator" from "myself_role"
-      And I submit with the 5th button
+      And I submit with the 4th button
     Then I should see "Updated other_pseud."
     When I go to the collections page
     Then I should see "My Collection Thing"
diff --git a/features/step_definitions/generic_steps.rb b/features/step_definitions/generic_steps.rb
index b763ad3fbc8..25a66b3ec78 100644
--- a/features/step_definitions/generic_steps.rb
+++ b/features/step_definitions/generic_steps.rb
@@ -213,10 +213,16 @@ def assure_xpath_not_present(tag, attribute, value, selector)
 # "I submit with the 2nd button", but in those cases you probably want to make sure that
 # the different forms have different button text anyway, and submit them using
 # When I press "Button Text"
-When /^I submit with the (\d+)(?:st|nd|rd|th) button$/ do |index|
+When /^I submit with the (\d+)(?:st|nd|rd|th) button$/ do |index| # rubocop:disable Cucumber/RegexStepName
   page.all("input[type='submit']")[(index.to_i - 1)].click
 end
 
+# This is for buttons generated with the button_to helper method. They use a different HTML element,
+# <button> instead of <input type="submit">.
+When /^I click the (\d+)(?:st|nd|rd|th) button$/ do |index| # rubocop:disable Cucumber/RegexStepName
+  page.all("button")[index.to_i - 1].click
+end
+
 # This will submit the first submit button inside a <p class="submit"> by default
 # That wrapping paragraph tag will be generated automatically if you use
 # the submit_button or submit_fieldset helpers in application_helper.rb
diff --git a/lib/skin_wizard.rb b/lib/skin_wizard.rb
index 98d6c11e94d..4fd418c99c5 100644
--- a/lib/skin_wizard.rb
+++ b/lib/skin_wizard.rb
@@ -20,8 +20,10 @@ def header_styles(color)
         #header .user a:focus,
         #dashboard a:hover,
         .actions a:hover,
+        .actions button:hover,
         .actions input:hover,
         .actions a:focus,
+        .actions button:focus,
         .actions input:focus,
         label.action:hover,
         .action:hover,
diff --git a/public/stylesheets/masters/low_vision_default/low_vision_default_site_screen_.css b/public/stylesheets/masters/low_vision_default/low_vision_default_site_screen_.css
index 8aa6a80cb08..a6db7ec05e2 100644
--- a/public/stylesheets/masters/low_vision_default/low_vision_default_site_screen_.css
+++ b/public/stylesheets/masters/low_vision_default/low_vision_default_site_screen_.css
@@ -49,6 +49,9 @@ media .listbox {
 .actions input,
 .actions input:hover,
 .actions input:focus,
+.actions button,
+.actions button:hover,
+.actions button:focus,
 .flash,
 fieldset,
 #header ul.primary li.search,
diff --git a/public/stylesheets/masters/reversi/reversi_site_screen_.css b/public/stylesheets/masters/reversi/reversi_site_screen_.css
index efbe3bc79e7..42cbb4695c1 100644
--- a/public/stylesheets/masters/reversi/reversi_site_screen_.css
+++ b/public/stylesheets/masters/reversi/reversi_site_screen_.css
@@ -184,6 +184,7 @@ a.tag:hover,
 #header p,
 #dashboard a:hover,
 .actions a:hover,
+.actions button:hover,
 .actions input:hover,
 .delete a,
 span.delete,
@@ -256,6 +257,7 @@ span.series .divider {
 .actions a:link,
 .action,
 .action:link,
+.actions button,
 .actions input,
 input[type="submit"],
 button,
@@ -270,9 +272,11 @@ button,
 }
 
 .actions a:hover,
+.actions button:hover,
 .actions input:hover,
 #dashboard a:hover,
 .actions a:focus,
+.actions button:focus,
 .actions input:focus,
 #dashboard a:focus,
 .actions .disabled select {
diff --git a/public/stylesheets/masters/snow/snow_site_screen_.css b/public/stylesheets/masters/snow/snow_site_screen_.css
index c3efa01847e..a882671771b 100644
--- a/public/stylesheets/masters/snow/snow_site_screen_.css
+++ b/public/stylesheets/masters/snow/snow_site_screen_.css
@@ -5,6 +5,7 @@ col.name,
 fieldset fieldset,
 fieldset dl dl,
 form blockquote.userstuff,
+button:focus,
 input:focus,
 select:focus,
 textarea:focus,
diff --git a/public/stylesheets/masters/snow_blue/snow_blue_site_screen_.css b/public/stylesheets/masters/snow_blue/snow_blue_site_screen_.css
index 3ea53c521f9..a91751f2236 100644
--- a/public/stylesheets/masters/snow_blue/snow_blue_site_screen_.css
+++ b/public/stylesheets/masters/snow_blue/snow_blue_site_screen_.css
@@ -16,6 +16,7 @@ a.tag:hover {
 #header p,
 #dashboard a:hover,
 .actions a:hover,
+.actions button:hover,
 .actions input:hover,
 .delete a,
 span.delete,
diff --git a/public/stylesheets/site/2.0/08-actions.css b/public/stylesheets/site/2.0/08-actions.css
index aaa3e053026..2d05a5441fb 100644
--- a/public/stylesheets/site/2.0/08-actions.css
+++ b/public/stylesheets/site/2.0/08-actions.css
@@ -20,7 +20,7 @@ ul.actions {
   padding-top: 0;
 }
 
-.actions a, .actions a:link, .action, .action:link, .actions input, input[type="submit"], button, .current, .actions label {
+.actions a, .actions a:link, .action, .action:link, .actions button, .actions input, input[type="submit"], button, .current, .actions label {
   background: #eee;
   color: #444;
   width: auto;
@@ -87,7 +87,7 @@ ol.pagination, div.pagination, ol.year {
   color: #111;
 }
 
-.actions a:hover, .actions input:hover, .actions a:focus, .actions input:focus, label.action:hover, .action:hover, .action:focus {
+.actions a:hover, .actions button:hover, .actions input:hover, .actions a:focus, .actions button:focus, .actions input:focus, label.action:hover, .action:hover, .action:focus {
   color: #900;
   border-top: 1px solid #999;
   border-left: 1px solid #999;
@@ -111,7 +111,7 @@ ol.pagination, div.pagination, ol.year {
    border-color: #aaa;
  }
 
-.actions li a, .actions li input, .actions li input[type="submit"], .actions li .current, .actions li label {
+.actions li a, .actions li button, .actions li input, .actions li input[type="submit"], .actions li .current, .actions li label {
   margin: 0.375em auto;
 }