diff --git a/Gemfile.lock b/Gemfile.lock
index 0ecbce7..d5ce47c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,8 @@ GEM
     regexp_parser (2.9.0)
     reline (0.5.0)
       io-console (~> 0.5)
-    rexml (3.2.6)
+    rexml (3.3.3)
+      strscan
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -80,6 +81,7 @@ GEM
       irb (~> 1.0)
       rake (>= 10.0.0)
     stringio (3.1.0)
+    strscan (3.1.0)
     tanker-identity (3.3.0)
       rbnacl (~> 7.0)
     thor (1.3.1)