diff --git a/Gemfile.lock b/Gemfile.lock
index cb707e8..bc74797 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,7 +19,8 @@ GEM
     racc (1.7.3)
     rainbow (3.1.1)
     regexp_parser (2.9.0)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
@@ -62,6 +63,7 @@ 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)
     webmock (3.14.0)
       addressable (>= 2.8.0)