diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2a025b7..e038412 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,6 +22,7 @@ jobs:
           - "7.0"
           - "7.1"
           - "7.2"
+          - "8.0"
 
         ruby:
           - "2.4"
@@ -40,64 +41,48 @@ jobs:
         exclude:
           - rails: "4.2"
             ruby: "2.7"
-
           - rails: "4.2"
             ruby: "3.0"
-
           - rails: "4.2"
             ruby: "3.1"
-
           - rails: "4.2"
             ruby: "3.2"
-
           - rails: "4.2"
             ruby: "3.3"
 
           - rails: "5.0"
             ruby: "3.0"
-
           - rails: "5.0"
             ruby: "3.1"
-
           - rails: "5.0"
             ruby: "3.2"
-
           - rails: "5.0"
             ruby: "3.3"
 
           - rails: "5.1"
             ruby: "3.0"
-
           - rails: "5.1"
             ruby: "3.1"
-
           - rails: "5.1"
             ruby: "3.2"
-
           - rails: "5.1"
             ruby: "3.3"
 
           - rails: "5.2"
             ruby: "3.0"
-
           - rails: "5.2"
             ruby: "3.1"
-
           - rails: "5.2"
             ruby: "3.2"
-
           - rails: "5.2"
             ruby: "3.3"
 
           - rails: "6.0"
             ruby: "2.4"
-
           - rails: "6.0"
             ruby: "3.1"
-
           - rails: "6.0"
             ruby: "3.2"
-
           - rails: "6.0"
             ruby: "3.3"
 
@@ -106,37 +91,42 @@ jobs:
 
           - rails: "7.0"
             ruby: "2.4"
-
           - rails: "7.0"
             ruby: "2.5"
-
           - rails: "7.0"
             ruby: "2.6"
 
           - rails: "7.1"
             ruby: "2.4"
-
           - rails: "7.1"
             ruby: "2.5"
-
           - rails: "7.1"
             ruby: "2.6"
 
           - rails: "7.2"
             ruby: "2.4"
-
           - rails: "7.2"
             ruby: "2.5"
-
           - rails: "7.2"
             ruby: "2.6"
-
           - rails: "7.2"
             ruby: "2.7"
-
           - rails: "7.2"
             ruby: "3.0"
 
+          - rails: "8.0"
+            ruby: "2.4"
+          - rails: "8.0"
+            ruby: "2.5"
+          - rails: "8.0"
+            ruby: "2.6"
+          - rails: "8.0"
+            ruby: "2.7"
+          - rails: "8.0"
+            ruby: "3.0"
+          - rails: "8.0"
+            ruby: "3.1"
+
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/spec/gemfiles/Gemfile.rails-${{ matrix.rails }}
 
diff --git a/lib/axlsx_rails/action_controller.rb b/lib/axlsx_rails/action_controller.rb
index 24c4bc0..53cb6c1 100644
--- a/lib/axlsx_rails/action_controller.rb
+++ b/lib/axlsx_rails/action_controller.rb
@@ -4,7 +4,7 @@
 
 if Rails.version.to_f >= 5
   unless Mime[:xlsx]
-  	Mime::Type.register 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', :xlsx
+    Mime::Type.register 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', :xlsx
   end
 else
   unless defined? Mime::XLSX
diff --git a/spec/gemfiles/Gemfile.rails-7.1 b/spec/gemfiles/Gemfile.rails-7.1
index f6e8adf..22bbc17 100644
--- a/spec/gemfiles/Gemfile.rails-7.1
+++ b/spec/gemfiles/Gemfile.rails-7.1
@@ -11,4 +11,4 @@ gem 'thin'
 gem 'capybara', '~> 3.0'
 gem 'acts_as_caxlsx', git: 'https://github.com/caxlsx/acts_as_caxlsx.git'
 
-gem 'byebug'
+gem 'debug'
diff --git a/spec/gemfiles/Gemfile.rails-7.2 b/spec/gemfiles/Gemfile.rails-7.2
index 7cba1b4..01990a8 100644
--- a/spec/gemfiles/Gemfile.rails-7.2
+++ b/spec/gemfiles/Gemfile.rails-7.2
@@ -11,4 +11,4 @@ gem 'thin'
 gem 'capybara', '~> 3.0'
 gem 'acts_as_caxlsx', git: 'https://github.com/caxlsx/acts_as_caxlsx.git'
 
-gem 'byebug'
+gem 'debug'
diff --git a/spec/gemfiles/Gemfile.rails-8.0 b/spec/gemfiles/Gemfile.rails-8.0
new file mode 100644
index 0000000..f97329c
--- /dev/null
+++ b/spec/gemfiles/Gemfile.rails-8.0
@@ -0,0 +1,14 @@
+source "http://rubygems.org"
+
+gemspec path: '../../'
+
+gem 'rails', '~> 8.0.0'
+gem 'responders', '~> 3.0'
+gem 'sqlite3'
+gem 'sprockets', '~> 4.0'
+gem 'jquery-rails'
+gem 'thin'
+gem 'capybara', '~> 3.0'
+gem 'acts_as_caxlsx', git: 'https://github.com/caxlsx/acts_as_caxlsx.git'
+
+gem 'debug'
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 83325f8..5a127cd 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -14,7 +14,13 @@
 require 'rspec/rails'
 require 'capybara/rspec'
 require 'roo'
-require 'byebug'
+begin
+  # Used for Ruby 2.x
+  require 'byebug'
+rescue LoadError
+  # Used for Ruby 3.x
+  require 'debug'
+end
 
 ActiveRecord::Migration.maintain_test_schema!
 
@@ -26,6 +32,7 @@
   config.use_transactional_fixtures = false
   config.infer_base_class_for_anonymous_controllers = false
   config.order = "random"
+  config.filter_run_when_matching :focus
 end
 
 # TODO: move to the support folder