diff --git a/Gemfile.lock b/Gemfile.lock
index 137ecae..e777067 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -62,7 +62,8 @@ GEM
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.5.0)
-    rexml (3.2.5)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
@@ -97,6 +98,7 @@ GEM
       rubocop (>= 1.7.0, < 2.0)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
+    strscan (3.1.0)
     tzinfo (2.0.5)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.2.0)