diff --git a/docs-book/Gemfile.lock b/docs-book/Gemfile.lock
index 2e57049..0df3d50 100644
--- a/docs-book/Gemfile.lock
+++ b/docs-book/Gemfile.lock
@@ -186,7 +186,7 @@ GEM
     thor (0.20.3)
     thread_safe (0.3.6)
     tilt (1.4.1)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uber (0.0.15)
     uglifier (2.7.2)