diff --git a/Gemfile.lock b/Gemfile.lock
index a9ad2d6..dea1097 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -271,7 +271,7 @@ GEM
     rdoc (6.7.0)
       psych (>= 4.0.0)
     redcarpet (3.6.0)
-    rexml (3.3.8)
+    rexml (3.3.9)
     ruby-vips (2.2.2)
       ffi (~> 1.12)
       logger