diff --git a/Gemfile.lock b/Gemfile.lock
index 246e943..633939d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -42,7 +42,8 @@ GEM
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.6.2)
-    rexml (3.2.5)
+    rexml (3.3.6)
+      strscan
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -88,6 +89,7 @@ GEM
     simplecov-html (0.12.3)
     simplecov-lcov (0.8.0)
     simplecov_json_formatter (0.1.4)
+    strscan (3.1.0)
     tzinfo (2.0.5)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.4.2)