diff --git a/Gemfile.lock b/Gemfile.lock
index 144e2df..312398f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -69,7 +69,7 @@ GEM
     public_suffix (4.0.3)
     pygments.rb (1.2.1)
       multi_json (>= 1.0.0)
-    rack (2.2.2)
+    rack (2.2.6.2)
     rake (12.3.3)
     rdiscount (2.2.0.1)
     ref (2.0.0)