```ruby
# -*- encoding: utf-8 -*-

Gem::Specification.new do |s|
  s.name = "gir_ffi-gtk"
  s.version = "0.6.0"

  s.summary = "GirFFI-based Ruby bindings for Gtk+ 2 and 3"

  s.authors = ["Matijs van Zuijlen"]
  s.email = ["matijs@matijs.net"]
  s.homepage = "http://www.github.com/mvz/gir_ffi-gtk"

  s.files = Dir['{lib,test,tasks,examples}/**/*', "*.md", "Rakefile", "COPYING.LIB"] & `git ls-files -z`.split("\0")
  s.test_files = `git ls-files -z -- test`.split("\0")

  s.add_runtime_dependency('gir_ffi', ["~> 0.6.0"])
  s.add_development_dependency('minitest', ["~> 5.0"])
  s.add_development_dependency('rr', ["~> 1.0.4"])
  s.add_development_dependency('rake', ["~> 10.0.3"])

  s.require_paths = ["lib"]
end
```

Update dependency on GirFFI and other gems
user
```ruby
# -*- encoding: utf-8 -*-

Gem::Specification.new do |s|
  s.name = "gir_ffi-gtk"
  s.version = "0.6.0"

  s.summary = "GirFFI-based Ruby bindings for Gtk+ 2 and 3"

  s.authors = ["Matijs van Zuijlen"]
  s.email = ["matijs@matijs.net"]
  s.homepage = "http://www.github.com/mvz/gir_ffi-gtk"

  s.files = Dir['{lib,test,tasks,examples}/**/*', "*.md", "Rakefile", "COPYING.LIB"] & `git ls-files -z`.split("\0")
  s.test_files = `git ls-files -z -- test`.split("\0")

  s.add_runtime_dependency('gir_ffi', ["~> 0.7.0"])
  s.add_development_dependency('minitest', ["~> 5.0"])
  s.add_development_dependency('rr', ["~> 1.1.2"])
  s.add_development_dependency('rake', ["~> 10.1"])

  s.require_paths = ["lib"]
end
```
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