diff --git a/Gemfile.lock b/Gemfile.lock
index 899cfe6..d478e7b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,7 +34,8 @@ GEM
     regexp_parser (2.9.0)
     reline (0.5.0)
       io-console (~> 0.5)
-    rexml (3.2.6)
+    rexml (3.3.6)
+      strscan
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -87,6 +88,7 @@ GEM
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.20.2)
     stringio (3.1.0)
+    strscan (3.1.0)
     unicode-display_width (2.5.0)
 
 PLATFORMS