diff --git a/Gemfile.lock b/Gemfile.lock
index 9ea8894..eecc2d5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,8 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     rouge (3.18.0)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
@@ -100,6 +101,7 @@ GEM
     safe_yaml (1.0.5)
     sassc (2.3.0)
       ffi (~> 1.9)
+    strscan (3.1.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     unicode-display_width (1.6.1)