diff --git a/Gemfile.lock b/Gemfile.lock
index 76d7843..141d976 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -307,7 +307,8 @@ GEM
     responders (3.1.1)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.2.6)
+    rexml (3.3.3)
+      strscan
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
@@ -393,6 +394,7 @@ GEM
     stimulus-rails (1.3.3)
       railties (>= 6.0.0)
     stringio (3.1.0)
+    strscan (3.1.0)
     thor (1.3.1)
     thread_safe (0.3.6)
     tilt (2.3.0)