diff --git a/sidetiq.gemspec b/sidetiq.gemspec
index 891e83b..2b81da3 100644
--- a/sidetiq.gemspec
+++ b/sidetiq.gemspec
@@ -19,6 +19,6 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.extensions    = ['ext/sidetiq_ext/extconf.rb']
 
-  gem.add_dependency 'sidekiq'
-  gem.add_dependency 'ice_cube'
+  gem.add_dependency 'sidekiq',  '~> 2.7.0'
+  gem.add_dependency 'ice_cube', '~> 0.9.3'
 end