diff --git a/Gemfile.lock b/Gemfile.lock
index a85f0c5..0f68812 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,8 @@ GEM
     rainbow (3.0.0)
     rake (13.0.6)
     regexp_parser (2.1.1)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
@@ -79,6 +80,7 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
+    strscan (3.1.0)
     thor (1.0.1)
     tty-color (0.6.0)
     tty-cursor (0.7.1)