diff --git a/Gemfile b/Gemfile
index e542d54..c3b6469 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,9 @@ require 'rbconfig'
 
 if Config::CONFIG['target_os'] =~ /darwin/i
   gem 'rb-fsevent', '>= 0.3.2'
+  gem 'growl',      '~> 1.0.3'
 end
 if Config::CONFIG['target_os'] =~ /linux/i
   gem 'rb-inotify', '>= 0.5.1'
+  gem 'libnotify',  '~> 0.1.3'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index bb8b57e..ea14785 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,33 +3,26 @@ PATH
   specs:
     guard (0.2.0.beta.1)
       bundler (~> 1.0.2)
-      growl (~> 1.0.3)
-      libnotify (~> 0.1.3)
       thor (~> 0.14.3)
 
 GEM
   remote: http://rubygems.org/
   specs:
     diff-lcs (1.1.2)
-    ffi (0.6.3)
-      rake (>= 0.8.7)
     growl (1.0.3)
     guard-rspec (0.1.3)
       guard
-    libnotify (0.1.4)
-      ffi (>= 0.6.2)
-    rake (0.8.7)
     rb-fsevent (0.3.2)
-    rspec (2.0.0)
-      rspec-core (= 2.0.0)
-      rspec-expectations (= 2.0.0)
-      rspec-mocks (= 2.0.0)
-    rspec-core (2.0.0)
-    rspec-expectations (2.0.0)
+    rspec (2.0.1)
+      rspec-core (~> 2.0.1)
+      rspec-expectations (~> 2.0.1)
+      rspec-mocks (~> 2.0.1)
+    rspec-core (2.0.1)
+    rspec-expectations (2.0.1)
       diff-lcs (>= 1.1.2)
-    rspec-mocks (2.0.0)
-      rspec-core (= 2.0.0)
-      rspec-expectations (= 2.0.0)
+    rspec-mocks (2.0.1)
+      rspec-core (~> 2.0.1)
+      rspec-expectations (~> 2.0.1)
     thor (0.14.3)
 
 PLATFORMS
@@ -40,7 +33,6 @@ DEPENDENCIES
   growl (~> 1.0.3)
   guard!
   guard-rspec (~> 0.1.3)
-  libnotify (~> 0.1.3)
   rb-fsevent (>= 0.3.2)
-  rspec (~> 2.0.0)
+  rspec (~> 2.0.1)
   thor (~> 0.14.3)