diff --git a/Gemfile.lock b/Gemfile.lock
index b5d7a74..5e4ce7a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -155,7 +155,7 @@ GEM
       mem
       pygments.rb (~> 1.0)
       sanitize
-    rack (2.2.3)
+    rack (2.2.6.2)
     rack-pjax (1.0.0)
       nokogiri (~> 1.5)
       rack (>= 1.1)