diff --git a/Gemfile.lock b/Gemfile.lock
index 11d486b..5b181c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,8 @@ GEM
       simplecov (>= 0.7)
       term-ansicolor
       thor
-    crack (0.3.1)
+    crack (0.4.5)
+      rexml
     diff-lcs (1.2.5)
     docile (1.1.5)
     guard (1.5.4)
@@ -42,6 +43,7 @@ GEM
     rest-client (1.7.2)
       mime-types (>= 1.16, < 3.0)
       netrc (~> 0.7)
+    rexml (3.2.5)
     rspec (2.14.1)
       rspec-core (~> 2.14.0)
       rspec-expectations (~> 2.14.0)