```ruby
# encoding: utf-8
# frozen_string_literal: true

lib = File.expand_path("../lib", __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require "rubygems/compiler/version"

Gem::Specification.new do |spec|
  # basic
  spec.name = "gem-compiler"
  spec.version = Gem::Compiler::VERSION
  spec.platform = Gem::Platform::RUBY

  # description
  spec.summary = "A RubyGems plugin that generates binary gems."
  spec.description = <<-EOF
A RubyGems plugin that helps generates binary gems from already existing
ones without altering the original source code. It compiles Ruby C
extensions and bundles the result into a new gem.
EOF

  # project info
  spec.homepage = "https://github.com/luislavena/gem-compiler"
  spec.licenses = ["MIT"]
  spec.author = "Luis Lavena"
  spec.email = "luislavena@gmail.com"

  # files
  spec.files = Dir["README.md", "CHANGELOG.md", "Rakefile",
                   "lib/**/*.rb", "test/**/test*.rb"]

  # requirements
  spec.required_ruby_version = ">= 2.4.0"
  spec.required_rubygems_version = ">= 2.6.0"

  # development dependencies
  spec.add_development_dependency "rake", "~> 12.0", ">= 12.0.0"
  spec.add_development_dependency "minitest", "~> 4.7"
end
```

Update Minitest to support Ruby 3
user
```ruby
# encoding: utf-8
# frozen_string_literal: true

lib = File.expand_path("../lib", __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require "rubygems/compiler/version"

Gem::Specification.new do |spec|
  # basic
  spec.name = "gem-compiler"
  spec.version = Gem::Compiler::VERSION
  spec.platform = Gem::Platform::RUBY

  # description
  spec.summary = "A RubyGems plugin that generates binary gems."
  spec.description = <<-EOF
A RubyGems plugin that helps generates binary gems from already existing
ones without altering the original source code. It compiles Ruby C
extensions and bundles the result into a new gem.
EOF

  # project info
  spec.homepage = "https://github.com/luislavena/gem-compiler"
  spec.licenses = ["MIT"]
  spec.author = "Luis Lavena"
  spec.email = "luislavena@gmail.com"

  # files
  spec.files = Dir["README.md", "CHANGELOG.md", "Rakefile",
                   "lib/**/*.rb", "test/**/test*.rb"]

  # requirements
  spec.required_ruby_version = ">= 2.4.0"
  spec.required_rubygems_version = ">= 2.6.0"

  # development dependencies
  spec.add_development_dependency "rake", "~> 12.0", ">= 12.0.0"

  # minitest 5.14.2 is required to support Ruby 3.0
  spec.add_development_dependency "minitest", "~> 5.14", ">= 5.14.2"
end
```
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