diff --git a/Gemfile.lock b/Gemfile.lock
index bad00f3..f1d00ba 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     aws-missing-tools (0.0.1)
-      aws-sdk
+      aws-sdk (~> 1.11)
 
 GEM
   remote: https://rubygems.org/
@@ -29,4 +29,4 @@ PLATFORMS
 
 DEPENDENCIES
   aws-missing-tools!
-  rspec
+  rspec (~> 2.12)
diff --git a/aws-missing-tools.gemspec b/aws-missing-tools.gemspec
index f7901d2..b7e5352 100644
--- a/aws-missing-tools.gemspec
+++ b/aws-missing-tools.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = %w(lib)
   gem.version       = AwsMissingTools::VERSION
 
-  gem.add_dependency 'aws-sdk'
+  gem.add_dependency 'aws-sdk', '~> 1.11'
 
-  gem.add_development_dependency 'rspec'
+  gem.add_development_dependency 'rspec', '~> 2.12'
 end