diff --git a/Gemfile.lock b/Gemfile.lock
index 2ba3e9c..cec15de 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,7 +36,8 @@ GEM
     rainbow (3.1.1)
     rake (13.1.0)
     regexp_parser (2.6.0)
-    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)
@@ -78,6 +79,7 @@ GEM
       rack (~> 2.2, >= 2.2.4)
       rack-protection (= 3.2.0)
       tilt (~> 2.0)
+    strscan (3.1.0)
     tilt (2.3.0)
     unicode-display_width (2.3.0)