diff --git a/Gemfile.lock b/Gemfile.lock
index e45ca56..7729978 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,7 +26,8 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     rake (13.1.0)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -40,6 +41,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.0)
+    strscan (3.1.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)