diff --git a/Gemfile.lock b/Gemfile.lock
index 413cfb9..9743e83 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,8 @@ GEM
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.8.2)
-    rexml (3.2.6)
+    rexml (3.3.2)
+      strscan
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -120,6 +121,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
+    strscan (3.1.0)
     timeout (0.4.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)