diff --git a/Gemfile.lock b/Gemfile.lock
index 26a6bb8..0ccfb7f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,7 +22,8 @@ GEM
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.9.0)
-    rexml (3.2.6)
+    rexml (3.3.3)
+      strscan
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -66,6 +67,7 @@ GEM
     standard-performance (1.3.1)
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.20.2)
+    strscan (3.1.0)
     unicode-display_width (2.5.0)
 
 PLATFORMS