diff --git a/Gemfile.lock b/Gemfile.lock
index 7f83055f6..1f24573cf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -620,7 +620,7 @@ GEM
       unf (~> 0.1.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    tzinfo-data (1.2018.7)
+    tzinfo-data (1.2018.9)
       tzinfo (>= 1.0.0)
     unf (0.1.4)
       unf_ext