diff --git a/Gemfile.lock b/Gemfile.lock
index 52fcb3a..4b4fc8d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,7 +41,7 @@ GEM
     rainbow (3.1.1)
     rake (12.3.3)
     regexp_parser (2.8.1)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)