diff --git a/Gemfile.lock b/Gemfile.lock
index cf4bb57..8b4aa33 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,7 +25,8 @@ GEM
     rainbow (3.0.0)
     rake (13.0.3)
     regexp_parser (2.1.1)
-    rexml (3.2.4)
+    rexml (3.3.3)
+      strscan
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
@@ -65,6 +66,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.2)
+    strscan (3.1.0)
     unicode-display_width (2.0.0)
 
 PLATFORMS