diff --git a/2018/Gemfile.lock b/2018/Gemfile.lock
index 1b6eee30..b602c9df 100644
--- a/2018/Gemfile.lock
+++ b/2018/Gemfile.lock
@@ -234,7 +234,7 @@ GEM
     thread_safe (0.3.6)
     typhoeus (1.3.0)
       ethon (>= 0.9.0)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     unicode-display_width (1.4.0)