diff --git a/Gemfile.lock b/Gemfile.lock
index b59a7f7..2290316 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,7 +36,8 @@ GEM
     racc (1.7.3)
     rainbow (3.1.1)
     regexp_parser (2.8.3)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
@@ -83,6 +84,7 @@ GEM
     standard-performance (1.2.1)
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.19.1)
+    strscan (3.1.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.5.0)