diff --git a/Gemfile b/Gemfile
index 7f891ac..b4e2a20 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,3 @@
 source "https://rubygems.org"
 
 gemspec
-
-group :development do
-  gem 'guard-rake'
-end
diff --git a/site-inspector.gemspec b/site-inspector.gemspec
index d15800d..34363ad 100644
--- a/site-inspector.gemspec
+++ b/site-inspector.gemspec
@@ -19,18 +19,19 @@ Gem::Specification.new do |s|
     "lib/site-inspector/sniffer.rb",
     "LICENSE"
   ]
-  s.add_dependency("nokogiri")
-  s.add_dependency("public_suffix")
-  s.add_dependency("gman")
-  s.add_dependency("dnsruby")
-  s.add_dependency("sniffles")
-  s.add_dependency("typhoeus")
-  s.add_development_dependency("pry")
-  s.add_development_dependency( "rake" )
-  s.add_development_dependency( "shoulda" )
-  s.add_development_dependency( "rdoc" )
-  s.add_development_dependency( "bundler" )
-  s.add_development_dependency( "rerun" )
-  s.add_development_dependency( "vcr" )
-  s.add_development_dependency( "webmock" )
+  s.add_dependency("nokogiri", "~> 1.6")
+  s.add_dependency("public_suffix", "~> 1.4")
+  s.add_dependency("gman", "~> 4.1")
+  s.add_dependency("dnsruby", "~> 1.56")
+  s.add_dependency("sniffles", "~> 0.2")
+  s.add_dependency("typhoeus", "~> 0.6")
+  s.add_development_dependency("pry", "~> 0.10")
+  s.add_development_dependency( "rake", "~> 10.4" )
+  s.add_development_dependency( "shoulda", "~> 3.5" )
+  s.add_development_dependency( "rdoc", "~> 4.1" )
+  s.add_development_dependency( "bundler", "~> 1.6" )
+  s.add_development_dependency( "rerun", "~> 0.10" )
+  s.add_development_dependency( "vcr", "~> 2.9" )
+  s.add_development_dependency( "webmock", "~> 1.2" )
+  s.add_development_dependency( "guard-rake", "~> 1.0")
 end