diff --git a/Gemfile.lock b/Gemfile.lock
index c8faee0..00e1921 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -54,7 +54,8 @@ GEM
       webrick (~> 1.8)
     rake (13.0.6)
     regexp_parser (2.9.0)
-    rexml (3.2.6)
+    rexml (3.3.6)
+      strscan
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -81,6 +82,7 @@ GEM
       rack-protection (= 4.0.0)
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
+    strscan (3.1.0)
     tilt (2.3.0)
     webrick (1.8.1)
     websocket (1.2.10)