diff --git a/Gemfile.lock b/Gemfile.lock
index 1a5fb3d..93eb192 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -44,7 +44,7 @@ GEM
     rainbow (3.1.1)
     rake (12.3.3)
     regexp_parser (2.5.0)
-    rexml (3.2.5)
+    rexml (3.3.9)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)