diff --git a/guard-spork.gemspec b/guard-spork.gemspec
index c45b75f..2ab8760 100644
--- a/guard-spork.gemspec
+++ b/guard-spork.gemspec
@@ -16,13 +16,13 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = '>= 1.3.6'
   s.rubyforge_project         = 'guard-spork'
 
-  s.add_dependency 'guard', '>= 1.1'
-  s.add_dependency 'spork', '>= 0.8.4'
-  s.add_dependency 'childprocess', '>= 0.2.3'
+  s.add_dependency 'guard', '>= 2.2.3'
+  s.add_dependency 'spork', '~> 1.0rc'
+  s.add_dependency 'childprocess', '>= 0.3.9'
 
-  s.add_development_dependency 'bundler',     '~> 1.0'
-  s.add_development_dependency 'rspec',       '~> 2.10'
-  s.add_development_dependency 'guard-rspec', '~> 1.0'
+  s.add_development_dependency 'bundler',     '>= 1.3.5'
+  s.add_development_dependency 'rspec',       '~> 2.14'
+  s.add_development_dependency 'guard-rspec', '~> 4.0'
 
   s.files        = Dir.glob('{lib}/**/*') + %w[LICENSE README.md]
   s.require_path = 'lib'