diff --git a/Gemfile b/Gemfile
index 4ed10df6..6638f39b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,10 @@ gem "webrat", ">=0.7.0", :groups => [:cucumber, :test]
 gem "database_cleaner", ">=0.5.0", :groups => [:cucumber, :selenium]
 gem "cucumber-rails", "~>0.3.0", :groups => :cucumber
 
+group :development do
+  gem "ruby-debug"
+end
+
 group :test do
   gem "flexmock"
   gem "ZenTest", ">=4.0.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index 8b5104f8..7b77064a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,6 +27,7 @@ GEM
     bcrypt-ruby (2.1.4)
     builder (3.0.0)
     cgi_multipart_eof_fix (2.5.0)
+    columnize (0.3.4)
     cucumber (1.0.2)
       builder (>= 2.1.2)
       diff-lcs (>= 1.1.2)
@@ -52,6 +53,8 @@ GEM
     htmlentities (4.3.0)
     httpclient (2.2.1)
     json (1.5.3)
+    linecache (0.46)
+      rbx-require-relative (> 0.0.4)
     memory_test_fix (0.1.3)
     mongrel (1.1.5)
       cgi_multipart_eof_fix (>= 2.4)
@@ -70,10 +73,16 @@ GEM
       activesupport (= 2.3.14)
       rake (>= 0.8.3)
     rake (0.8.7)
+    rbx-require-relative (0.0.5)
     rspec (1.3.2)
     rspec-rails (1.3.4)
       rack (>= 1.0.0)
       rspec (~> 1.3.1)
+    ruby-debug (0.10.4)
+      columnize (>= 0.1)
+      ruby-debug-base (~> 0.10.4.0)
+    ruby-debug-base (0.10.4)
+      linecache (>= 0.3)
     ruby-openid (2.1.8)
     rubycas-client (2.2.1)
       activesupport
@@ -115,6 +124,7 @@ DEPENDENCIES
   rails (~> 2.3.12)
   rake (~> 0.8.7)
   rspec-rails (~> 1.3.3)
+  ruby-debug
   ruby-openid
   rubycas-client (~> 2.2.1)
   sanitize (~> 1.2.1)