diff --git a/lib/Gemfile b/lib/Gemfile
index 485d68d..ef12818 100644
--- a/lib/Gemfile
+++ b/lib/Gemfile
@@ -3,5 +3,5 @@ source "https://rubygems.org"
 gem "rake", "~> 10.0"
 
 group :test do
-  gem "rspec"
+  gem "minitest", "~> 4.6"
 end
diff --git a/lib/Gemfile.lock b/lib/Gemfile.lock
index 357be47..c38017c 100644
--- a/lib/Gemfile.lock
+++ b/lib/Gemfile.lock
@@ -1,20 +1,12 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.1.3)
+    minitest (4.6.2)
     rake (10.0.3)
-    rspec (2.12.0)
-      rspec-core (~> 2.12.0)
-      rspec-expectations (~> 2.12.0)
-      rspec-mocks (~> 2.12.0)
-    rspec-core (2.12.2)
-    rspec-expectations (2.12.1)
-      diff-lcs (~> 1.1.3)
-    rspec-mocks (2.12.2)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  minitest (~> 4.6)
   rake (~> 10.0)
-  rspec