diff --git a/Gemfile.lock b/Gemfile.lock
index 3115700..6d5216c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -84,7 +84,7 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.9)
+    rexml (3.4.2)
     rouge (3.26.0)
     ruby-vips (2.0.17)
       ffi (~> 1.9)