diff --git a/.github/workflows/test-migrations-one-step.yml b/.github/workflows/test-migrations-one-step.yml
index d7e424a8c4..212b2cfe73 100644
--- a/.github/workflows/test-migrations-one-step.yml
+++ b/.github/workflows/test-migrations-one-step.yml
@@ -23,9 +23,17 @@ jobs:
     needs: pre_job
     if: needs.pre_job.outputs.should_skip != 'true'
 
+    strategy:
+      fail-fast: false
+
+      matrix:
+        postgres:
+          - 14-alpine
+          - 15-alpine
+
     services:
       postgres:
-        image: postgres:14-alpine
+        image: postgres:${{ matrix.postgres}}
         env:
           POSTGRES_PASSWORD: postgres
           POSTGRES_USER: postgres
diff --git a/.github/workflows/test-migrations-two-step.yml b/.github/workflows/test-migrations-two-step.yml
index 25bf5ba87f..310153929d 100644
--- a/.github/workflows/test-migrations-two-step.yml
+++ b/.github/workflows/test-migrations-two-step.yml
@@ -23,9 +23,17 @@ jobs:
     needs: pre_job
     if: needs.pre_job.outputs.should_skip != 'true'
 
+    strategy:
+      fail-fast: false
+
+      matrix:
+        postgres:
+          - 14-alpine
+          - 15-alpine
+
     services:
       postgres:
-        image: postgres:14-alpine
+        image: postgres:${{ matrix.postgres}}
         env:
           POSTGRES_PASSWORD: postgres
           POSTGRES_USER: postgres
diff --git a/Dockerfile b/Dockerfile
index 91c26d2ac0..cb5096581c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -55,7 +55,7 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 ENV DEBIAN_FRONTEND="noninteractive" \
     PATH="${PATH}:/opt/ruby/bin:/opt/mastodon/bin"
 
-# Ignoreing these here since we don't want to pin any versions and the Debian image removes apt-get content after use
+# Ignoring these here since we don't want to pin any versions and the Debian image removes apt-get content after use
 # hadolint ignore=DL3008,DL3009
 RUN apt-get update && \
     echo "Etc/UTC" > /etc/localtime && \
diff --git a/Gemfile b/Gemfile
index 8c718b3569..e97b3e52ee 100644
--- a/Gemfile
+++ b/Gemfile
@@ -99,54 +99,87 @@ gem 'json-ld'
 gem 'json-ld-preloaded', '~> 3.2'
 gem 'rdf-normalize', '~> 0.5'
 
-group :development, :test do
-  gem 'fabrication', '~> 2.30'
-  gem 'fuubar', '~> 2.5'
-  gem 'i18n-tasks', '~> 1.0', require: false
-  gem 'rspec-rails', '~> 6.0'
-  gem 'rspec_chunked', '~> 0.6'
-
-  gem 'rubocop-capybara', require: false
-  gem 'rubocop-performance', require: false
-  gem 'rubocop-rails', require: false
-  gem 'rubocop-rspec', require: false
-  gem 'rubocop', require: false
-end
-
-group :production, :test do
-  gem 'private_address_check', '~> 0.5'
-end
+gem 'private_address_check', '~> 0.5'
 
 group :test do
-  gem 'capybara', '~> 3.39'
-  gem 'climate_control'
-  gem 'faker', '~> 3.2'
-  gem 'json-schema', '~> 4.0'
-  gem 'rack-test', '~> 2.1'
-  gem 'rails-controller-testing', '~> 1.0'
-  gem 'rspec_junit_formatter', '~> 0.6'
+  # RSpec runner for rails
+  gem 'rspec-rails', '~> 6.0'
+
+  # Used to split testing into chunks in CI
+  gem 'rspec_chunked', '~> 0.6'
+
+  # RSpec progress bar formatter
+  gem 'fuubar', '~> 2.5'
+
+  # Extra RSpec extenion methods and helpers for sidekiq
   gem 'rspec-sidekiq', '~> 3.1'
+
+  # Browser integration testing
+  gem 'capybara', '~> 3.39'
+
+  # Used to mock environment variables
+  gem 'climate_control', '~> 0.2'
+
+  # Generating fake data for specs
+  gem 'faker', '~> 3.2'
+
+  # Generate test objects for specs
+  gem 'fabrication', '~> 2.30'
+
+  # Add back helpers functions removed in Rails 5.1
+  gem 'rails-controller-testing', '~> 1.0'
+
+  # Validate schemas in specs
+  gem 'json-schema', '~> 4.0'
+
+  # Test harness fo rack components
+  gem 'rack-test', '~> 2.1'
+
+  # Coverage formatter for RSpec test if DISABLE_SIMPLECOV is false
   gem 'simplecov', '~> 0.22', require: false
+
+  # Stub web requests for specs
   gem 'webmock', '~> 3.18'
 end
 
 group :development do
+  # Code linting CLI and plugins
+  gem 'rubocop', require: false
+  gem 'rubocop-capybara', require: false
+  gem 'rubocop-performance', require: false
+  gem 'rubocop-rails', require: false
+  gem 'rubocop-rspec', require: false
+
+  # Annotates modules with schema
   gem 'annotate', '~> 3.2'
+
+  # Enhanced error message pages for development
   gem 'better_errors', '~> 2.9'
   gem 'binding_of_caller', '~> 1.0'
+
+  # Preview mail in the browser
   gem 'letter_opener', '~> 1.8'
   gem 'letter_opener_web', '~> 2.0'
-  gem 'memory_profiler'
+
+  # Security analysis CLI tools
   gem 'brakeman', '~> 5.4', require: false
   gem 'bundler-audit', '~> 0.9', require: false
+
+  # Linter CLI for HAML files
   gem 'haml_lint', require: false
 
+  # Deployment automation
   gem 'capistrano', '~> 3.17'
   gem 'capistrano-rails', '~> 1.6'
   gem 'capistrano-rbenv', '~> 2.2'
   gem 'capistrano-yarn', '~> 2.0'
 
-  gem 'stackprof'
+  # Validate missing i18n keys
+  gem 'i18n-tasks', '~> 1.0', require: false
+
+  # Profiling tools
+  gem 'memory_profiler', require: false
+  gem 'stackprof', require: false
 end
 
 group :production do
diff --git a/Gemfile.lock b/Gemfile.lock
index b5d277097a..acea3bbbed 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -601,8 +601,6 @@ GEM
       sidekiq (>= 2.4.0)
     rspec-support (3.12.0)
     rspec_chunked (0.6)
-    rspec_junit_formatter (0.6.0)
-      rspec-core (>= 2, < 4, != 2.12.0)
     rubocop (1.50.2)
       json (~> 2.3)
       parallel (~> 1.10)
@@ -787,7 +785,7 @@ DEPENDENCIES
   capybara (~> 3.39)
   charlock_holmes (~> 0.7.7)
   chewy (~> 7.3)
-  climate_control
+  climate_control (~> 0.2)
   cocoon (~> 1.2)
   color_diff (~> 0.1)
   concurrent-ruby
@@ -866,7 +864,6 @@ DEPENDENCIES
   rspec-rails (~> 6.0)
   rspec-sidekiq (~> 3.1)
   rspec_chunked (~> 0.6)
-  rspec_junit_formatter (~> 0.6)
   rubocop
   rubocop-capybara
   rubocop-performance
diff --git a/app/javascript/mastodon/utils/__tests__/html-test.js b/app/javascript/mastodon/utils/__tests__/html-test.js
index ef9296e6c3..d948cf4c5d 100644
--- a/app/javascript/mastodon/utils/__tests__/html-test.js
+++ b/app/javascript/mastodon/utils/__tests__/html-test.js
@@ -1,7 +1,7 @@
 import * as html from '../html';
 
 describe('html', () => {
-  describe('unsecapeHTML', () => {
+  describe('unescapeHTML', () => {
     it('returns unescaped HTML', () => {
       const output = html.unescapeHTML('<p>lorem</p><p>ipsum</p><br>&lt;br&gt;');
       expect(output).toEqual('lorem\n\nipsum\n<br>');
diff --git a/app/workers/post_process_media_worker.rb b/app/workers/post_process_media_worker.rb
index 996d5def91..2d11b00c20 100644
--- a/app/workers/post_process_media_worker.rb
+++ b/app/workers/post_process_media_worker.rb
@@ -24,7 +24,7 @@ class PostProcessMediaWorker
     media_attachment.processing = :in_progress
     media_attachment.save
 
-    # Because paperclip-av-transcover overwrites this attribute
+    # Because paperclip-av-transcoder overwrites this attribute
     # we will save it here and restore it after reprocess is done
     previous_meta = media_attachment.file_meta
 
diff --git a/lib/mastodon/media_cli.rb b/lib/mastodon/media_cli.rb
index 7dacd8d3d4..1bedcd9beb 100644
--- a/lib/mastodon/media_cli.rb
+++ b/lib/mastodon/media_cli.rb
@@ -24,7 +24,7 @@ module Mastodon
     desc 'remove', 'Remove remote media files, headers or avatars'
     long_desc <<-DESC
       Removes locally cached copies of media attachments (and optionally profile
-      headers and avatars) from other servers. By default, only media attachements
+      headers and avatars) from other servers. By default, only media attachments
       are removed.
       The --days option specifies how old media attachments have to be before
       they are removed. In case of avatars and headers, it specifies how old
diff --git a/lib/tasks/tests.rake b/lib/tasks/tests.rake
index ceb421f4b2..60399c9de1 100644
--- a/lib/tasks/tests.rake
+++ b/lib/tasks/tests.rake
@@ -25,7 +25,7 @@ namespace :tests do
       end
 
       if Account.where(domain: Rails.configuration.x.local_domain).exists?
-        puts 'Faux remote accounts not properly claned up'
+        puts 'Faux remote accounts not properly cleaned up'
         exit(1)
       end
 
diff --git a/spec/controllers/admin/confirmations_controller_spec.rb b/spec/controllers/admin/confirmations_controller_spec.rb
index ffab56d9aa..181616a66e 100644
--- a/spec/controllers/admin/confirmations_controller_spec.rb
+++ b/spec/controllers/admin/confirmations_controller_spec.rb
@@ -32,7 +32,7 @@ RSpec.describe Admin::ConfirmationsController do
     end
   end
 
-  describe 'POST #resernd' do
+  describe 'POST #resend' do
     subject { post :resend, params: { account_id: user.account.id } }
 
     let!(:user) { Fabricate(:user, confirmed_at: confirmed_at) }
diff --git a/spec/controllers/concerns/signature_verification_spec.rb b/spec/controllers/concerns/signature_verification_spec.rb
index df20a5d7ef..e6b7f18498 100644
--- a/spec/controllers/concerns/signature_verification_spec.rb
+++ b/spec/controllers/concerns/signature_verification_spec.rb
@@ -129,7 +129,7 @@ describe ApplicationController do
       end
     end
 
-    context 'with request with unparseable Date header' do
+    context 'with request with unparsable Date header' do
       before do
         get :success
 
diff --git a/spec/models/account_migration_spec.rb b/spec/models/account_migration_spec.rb
index 0d97ea7e77..519b9a97a5 100644
--- a/spec/models/account_migration_spec.rb
+++ b/spec/models/account_migration_spec.rb
@@ -25,7 +25,7 @@ RSpec.describe AccountMigration do
       end
     end
 
-    context 'with unresolveable account' do
+    context 'with unresolvable account' do
       let(:target_acct) { 'target@remote' }
 
       before do
diff --git a/spec/models/account_spec.rb b/spec/models/account_spec.rb
index bbe35f5793..6e9c608ab0 100644
--- a/spec/models/account_spec.rb
+++ b/spec/models/account_spec.rb
@@ -698,7 +698,7 @@ RSpec.describe Account do
       expect(subject.match('Check this out https://medium.com/@alice/some-article#.abcdef123')).to be_nil
     end
 
-    xit 'does not match URL querystring' do
+    xit 'does not match URL query string' do
       expect(subject.match('https://example.com/?x=@alice')).to be_nil
     end
   end
diff --git a/spec/models/user_settings/setting_spec.rb b/spec/models/user_settings/setting_spec.rb
index 9884ae4f89..8c8d31ec54 100644
--- a/spec/models/user_settings/setting_spec.rb
+++ b/spec/models/user_settings/setting_spec.rb
@@ -90,7 +90,7 @@ RSpec.describe UserSettings::Setting do
 
   describe '#key' do
     context 'when there is no namespace' do
-      it 'returnsn a symbol' do
+      it 'returns a symbol' do
         expect(subject.key).to eq :foo
       end
     end
diff --git a/spec/services/activitypub/process_account_service_spec.rb b/spec/services/activitypub/process_account_service_spec.rb
index 4c5e6b6cc3..db454d7ad9 100644
--- a/spec/services/activitypub/process_account_service_spec.rb
+++ b/spec/services/activitypub/process_account_service_spec.rb
@@ -181,7 +181,7 @@ RSpec.describe ActivityPub::ProcessAccountService, type: :service do
           '@context': ['https://www.w3.org/ns/activitystreams'],
           id: "https://foo.test/users/#{i}/featured",
           type: 'OrderedCollection',
-          totelItems: 1,
+          totalItems: 1,
           orderedItems: [status_json],
         }.with_indifferent_access
         webfinger = {