diff --git a/Gemfile.lock b/Gemfile.lock
index f45fb8d..8c26167 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,8 @@ GEM
     rake (13.0.6)
     regexp_parser (2.8.1)
     require_all (3.0.0)
-    rexml (3.2.6)
+    rexml (3.3.3)
+      strscan
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -85,6 +86,7 @@ GEM
     ruby-progressbar (1.13.0)
     shoulda-matchers (4.5.1)
       activesupport (>= 4.2.0)
+    strscan (3.1.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.4.2)