diff --git a/examples/simple_script/Gemfile.lock b/examples/simple_script/Gemfile.lock
index 002c127..9c0f9ef 100644
--- a/examples/simple_script/Gemfile.lock
+++ b/examples/simple_script/Gemfile.lock
@@ -10,7 +10,8 @@ GEM
       ast (~> 2.4.1)
     rainbow (3.0.0)
     regexp_parser (2.1.1)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rspec (3.7.0)
       rspec-core (~> 3.7.0)
       rspec-expectations (~> 3.7.0)
@@ -39,6 +40,7 @@ GEM
     rubocop-ast (1.11.0)
       parser (>= 3.0.1.1)
     ruby-progressbar (1.11.0)
+    strscan (3.1.0)
     unicode-display_width (2.1.0)
 
 PLATFORMS