diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c33f2fa..8fdcfe9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,20 +14,20 @@ jobs:
           #   gemfile: "rails_6_1"
           # - ruby: "2.7"
           #   gemfile: "rails_6_1"
-          - ruby: "2.6"
-            gemfile: "rails_6.1"
-          - ruby: "2.5"
-            gemfile: "rails_6.1"
+          - ruby: "3.4"
+            gemfile: "rails_8.0"
+          - ruby: "3.3"
+            gemfile: "rails_8.0"
 
           # - ruby: "2.7"
           #   gemfile: "rails_6_0"
-          - ruby: "2.6"
-            gemfile: "rails_6.0"
-          - ruby: "2.5"
-            gemfile: "rails_6.0"
+          - ruby: "3.4"
+            gemfile: "rails_7.2"
+          - ruby: "3.3"
+            gemfile: "rails_7.2"
 
-          - ruby: "2.5"
-            gemfile: "rails_5.2"
+          - ruby: "3.3"
+            gemfile: "rails_7.1"
 
     runs-on: ubuntu-latest
 
diff --git a/Appraisals b/Appraisals
index 36b171a..a07920f 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,35 +1,35 @@
-appraise 'rails-5.2' do
+appraise 'rails-7.0' do
   %w[
     actionview
     railties
   ].each do |rails_gem|
-    gem rails_gem, '~> 5.2.0'
+    gem rails_gem, '~> 7.0.0'
   end
 end
 
-appraise 'rails-6.0' do
+appraise 'rails-7.1' do
   %w[
     actionview
     railties
   ].each do |rails_gem|
-    gem rails_gem, '~> 6.0.0'
+    gem rails_gem, '~> 7.1.0'
   end
 end
 
-appraise 'rails-6.1' do
+appraise 'rails-7.2' do
   %w[
     actionview
     railties
   ].each do |rails_gem|
-    gem rails_gem, '~> 6.1.0'
+    gem rails_gem, '~> 7.2.0'
   end
 end
 
-appraise 'rails-7.0' do
+appraise 'rails-8.0' do
   %w[
     actionview
     railties
   ].each do |rails_gem|
-    gem rails_gem, '~> 7.0.0'
+    gem rails_gem, '~> 8.0.0'
   end
 end
diff --git a/Gemfile b/Gemfile
index e0810bb..fa75df1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,9 +1,3 @@
 source 'https://rubygems.org'
 
-group :test do
-  gem 'test-unit'
-  gem 'pry'
-  gem 'pry-byebug'
-end
-
 gemspec
diff --git a/deface.gemspec b/deface.gemspec
index 72c413f..fa9597c 100644
--- a/deface.gemspec
+++ b/deface.gemspec
@@ -29,24 +29,30 @@ Gem::Specification.new do |spec|
   spec.rdoc_options = ["--charset=UTF-8"]
   spec.extra_rdoc_files = ["README.markdown"]
 
-  spec.add_dependency('nokogiri', '>= 1.6')
-
   %w[
     actionview
     railties
   ].each do |rails_gem|
-    spec.add_dependency(rails_gem, '>= 5.2')
+    spec.add_dependency(rails_gem, '>= 7.0')
   end
-  spec.add_dependency('rainbow', '>= 2.1.0')
+
+  spec.add_dependency('base64')
+  spec.add_dependency('bigdecimal')
+  spec.add_dependency('drb')
+  spec.add_dependency('mutex_m')
+  spec.add_dependency('nokogiri', '>= 1.6')
   spec.add_dependency('polyglot')
+  spec.add_dependency('rainbow', '>= 2.1.0')
 
   spec.add_development_dependency('appraisal')
   spec.add_development_dependency('erubis')
   spec.add_development_dependency('gem-release')
-  spec.add_development_dependency('rspec', '>= 3.1.0')
-  spec.add_development_dependency('haml', ['>= 4.0', '< 6'])
-  spec.add_development_dependency('slim', '~> 4.1')
-  spec.add_development_dependency('simplecov', '>= 0.6.4')
   spec.add_development_dependency('generator_spec', '~> 0.8')
+  spec.add_development_dependency('haml', ['>= 4.0', '< 6'])
   spec.add_development_dependency('pry')
+  spec.add_development_dependency('pry-byebug')
+  spec.add_development_dependency('rspec', '>= 3.1.0')
+  spec.add_development_dependency('simplecov', '>= 0.6.4')
+  spec.add_development_dependency('slim', '~> 4.1')
+  spec.add_development_dependency('test-unit')
 end
diff --git a/gemfiles/rails_7.0.gemfile b/gemfiles/rails_7.0.gemfile
index 82c9963..e49f880 100644
--- a/gemfiles/rails_7.0.gemfile
+++ b/gemfiles/rails_7.0.gemfile
@@ -5,10 +5,4 @@ source "https://rubygems.org"
 gem "actionview", "~> 7.0.0"
 gem "railties", "~> 7.0.0"
 
-group :test do
-  gem "test-unit"
-  gem "pry"
-  gem "pry-byebug"
-end
-
 gemspec path: "../"
diff --git a/gemfiles/rails_7.1.gemfile b/gemfiles/rails_7.1.gemfile
new file mode 100644
index 0000000..ba79111
--- /dev/null
+++ b/gemfiles/rails_7.1.gemfile
@@ -0,0 +1,8 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "actionview", "~> 7.1.0"
+gem "railties", "~> 7.1.0"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_7.2.gemfile b/gemfiles/rails_7.2.gemfile
new file mode 100644
index 0000000..23fb22f
--- /dev/null
+++ b/gemfiles/rails_7.2.gemfile
@@ -0,0 +1,8 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "actionview", "~> 7.2.0"
+gem "railties", "~> 7.2.0"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_8.0.gemfile b/gemfiles/rails_8.0.gemfile
new file mode 100644
index 0000000..bb5ea2f
--- /dev/null
+++ b/gemfiles/rails_8.0.gemfile
@@ -0,0 +1,8 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "actionview", "~> 8.0.0"
+gem "railties", "~> 8.0.0"
+
+gemspec path: "../"
diff --git a/spec/deface/precompiler_spec.rb b/spec/deface/precompiler_spec.rb
index d043e0f..1aa0b3e 100644
--- a/spec/deface/precompiler_spec.rb
+++ b/spec/deface/precompiler_spec.rb
@@ -31,7 +31,7 @@ module Deface
 
       filename = 'spec/dummy/app/compiled_views/posts/precompileme.html.erb'
 
-      expect(File.exists?(filename)).to be_truthy
+      expect(File.exist?(filename)).to be_truthy
 
       file = File.open(filename, "rb")
       contents = file.read