diff --git a/Gemfile.lock b/Gemfile.lock
index 6486916..db87ccb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,19 +7,20 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (6.1.7.6)
+    activesupport (6.1.7.7)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
       tzinfo (~> 2.0)
       zeitwerk (~> 2.3)
     ast (2.4.2)
-    concurrent-ruby (1.2.2)
+    concurrent-ruby (1.2.3)
     docile (1.4.0)
-    i18n (1.14.1)
+    i18n (1.14.4)
       concurrent-ruby (~> 1.0)
     irb (1.0.0)
-    minitest (5.18.0)
+    json (2.7.1)
+    minitest (5.22.3)
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     parser (2.7.2.0)
@@ -54,16 +55,17 @@ GEM
     tilt (2.2.0)
     tins (1.29.1)
       sync
-    tzinfo (2.0.5)
+    tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     yard (0.9.34)
-    zeitwerk (2.6.11)
+    zeitwerk (2.6.13)
 
 PLATFORMS
-  ruby
+  x86_64-linux
 
 DEPENDENCIES
   irb
+  json
   minitest
   rake
   rdoc
diff --git a/ruby-bbcode.gemspec b/ruby-bbcode.gemspec
index 7b53c90..d843bc5 100644
--- a/ruby-bbcode.gemspec
+++ b/ruby-bbcode.gemspec
@@ -25,6 +25,7 @@ Gem::Specification.new do |s|
   s.extra_rdoc_files = ['README.md', 'CHANGELOG.md', 'MIT-LICENSE']
 
   s.add_dependency 'activesupport', '>= 4.2.2'
+  s.add_development_dependency 'json'
   s.add_development_dependency 'simplecov'
   s.add_development_dependency 'simplecov-lcov'
   s.add_development_dependency 'irb'
diff --git a/test/unit/configuration_test.rb b/test/unit/configuration_test.rb
index 4bd1bbb..eef62b1 100644
--- a/test/unit/configuration_test.rb
+++ b/test/unit/configuration_test.rb
@@ -1,6 +1,6 @@
 require 'test_helper'
 
-class ConfigurationTest < MiniTest::Test
+class ConfigurationTest < Minitest::Test
   def before_setup
     RubyBBCode.reset
   end
diff --git a/test/unit/tag_sifter_test.rb b/test/unit/tag_sifter_test.rb
index 98e005c..9045a56 100644
--- a/test/unit/tag_sifter_test.rb
+++ b/test/unit/tag_sifter_test.rb
@@ -1,6 +1,6 @@
 require 'test_helper'
 
-class TagSifterTest < MiniTest::Test
+class TagSifterTest < Minitest::Test
   include RubyBBCode::Tags
   def test_youtube_parser
     url1 = 'http://www.youtube.com/watch?v=E4Fbk52Mk1w'
diff --git a/test/unit/tags_test.rb b/test/unit/tags_test.rb
index 122f2d4..2d84ff0 100644
--- a/test/unit/tags_test.rb
+++ b/test/unit/tags_test.rb
@@ -1,6 +1,6 @@
 require 'test_helper'
 
-class TagSifterTest < MiniTest::Test
+class TagSifterTest < Minitest::Test
   def test_taglist_modification
     tags = RubyBBCode::Tags.tag_list
     assert_nil RubyBBCode::Tags.tag_list[:test]