diff --git a/Gemfile b/Gemfile
index 06cd52f44..3bc06b3d9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -147,7 +147,7 @@ group :test do
   gem 'cucumber-rails', '1.3.0', :require => false
   gem 'database_cleaner', '0.8'
 
-  gem 'timecop'
+  gem 'timecop', '0.5.1'
   gem 'factory_girl_rails', '4.1.0'
   gem 'fixture_builder', '0.3.4'
   gem 'fuubar', '1.0.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2ec9ffd68..a9a85153e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -421,7 +421,7 @@ GEM
       rack (>= 1.0.0)
     thor (0.16.0)
     tilt (1.3.3)
-    timecop (0.4.6)
+    timecop (0.5.1)
     treetop (1.4.10)
       polyglot
       polyglot (>= 0.3.1)
@@ -532,7 +532,7 @@ DEPENDENCIES
   settingslogic!
   spork (= 1.0.0rc3)
   thin (= 1.4.1)
-  timecop
+  timecop (= 0.5.1)
   twitter (= 2.0.2)
   typhoeus (= 0.3.3)
   uglifier (= 1.3.0)