diff --git a/Gemfile.lock b/Gemfile.lock
index 33f9d5b..b14bc7a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,8 @@ GEM
     diff-lcs (1.5.0)
     docile (1.4.0)
     rake (10.5.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
@@ -34,6 +35,7 @@ GEM
       simplecov (~> 0.19)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
+    strscan (3.1.0)
 
 PLATFORMS
   ruby