diff --git a/Gemfile.lock b/Gemfile.lock
index 6d95c4c..8a709a4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,8 @@ GEM
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
@@ -76,6 +77,7 @@ GEM
       docile (~> 1.1)
       simplecov-html (~> 0.11)
     simplecov-html (0.12.3)
+    strscan (3.1.0)
     thor (1.2.1)
     unicode-display_width (1.8.0)