diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7c46fce..f9308ee 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.0', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', 'jruby']
+        ruby-version: ['2.1', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', 'jruby']
 
     steps:
     - uses: actions/checkout@v3
@@ -36,7 +36,8 @@ jobs:
     - name: Run tests
       run: bundle exec rake test
     - name: Submit code coverage results
-      uses: paambaati/codeclimate-action@v3.2.0
+      uses: paambaati/codeclimate-action@v9.0.0
+      if: matrix.ruby-version != '2.1'
       env:
         CC_TEST_REPORTER_ID: ${{ secrets.CODECLIMATE_REPO_TOKEN }}
 
diff --git a/discid.gemspec b/discid.gemspec
index 9fbb573..f610f5d 100644
--- a/discid.gemspec
+++ b/discid.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |spec|
   spec.post_install_message = %q{Please make sure you have libdiscid (http://musicbrainz.org/doc/libdiscid) installed.}
 
   spec.requirements              = "libdiscid >= 0.1.0"
-  spec.required_ruby_version     = ">= 2.0"
+  spec.required_ruby_version     = ">= 2.1"
   spec.required_rubygems_version = ">= 1.3.6"
 
   spec.files         = Dir['{lib,examples,test}/**/*.rb'] +
@@ -31,5 +31,10 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "yard"
   spec.add_development_dependency "redcarpet" if not RUBY_PLATFORM == "java"
   spec.add_development_dependency "test-unit"
-  spec.add_development_dependency "simplecov", "< 0.18"
+
+  # The code coverage is only supported for Ruby >= 2.4
+  if (RUBY_VERSION.split('.').map{|s|s.to_i} <=> [2, 4, 0]) >= 0
+    spec.add_development_dependency "simplecov"
+    spec.add_development_dependency "simplecov_json_formatter"
+  end
 end
diff --git a/test/helper.rb b/test/helper.rb
index 8dc5991..49b40f4 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2014 Philipp Wolfer
+# Copyright (C) 2013-2014, 2025 Philipp Wolfer
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
@@ -15,10 +15,12 @@
 
 begin
   require 'simplecov'
+  require "simplecov_json_formatter"
 
+  SimpleCov.formatter = SimpleCov::Formatter::JSONFormatter
   SimpleCov.start do
     add_filter "/test/"
   end
 rescue LoadError
-  puts 'WARNING: codeclimate-test-reporter not available, no code coverage reported.'
+  puts 'WARNING: simplecov not available, no code coverage reported.'
 end