diff --git a/rack/blog/Gemfile.lock b/rack/blog/Gemfile.lock
index 1e92728..f5672c2 100644
--- a/rack/blog/Gemfile.lock
+++ b/rack/blog/Gemfile.lock
@@ -180,7 +180,7 @@ GEM
     turbolinks (5.2.0)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (4.1.20)
       execjs (>= 0.3.0, < 3)