diff --git a/Gemfile.lock b/Gemfile.lock
index 37adfcf..14bd694 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,7 @@ GEM
     racc (1.8.1)
     rainbow (3.1.1)
     regexp_parser (2.5.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)