diff --git a/son-gtkmano/Gemfile.lock b/son-gtkmano/Gemfile.lock
index 1e8397dc..37018dbc 100644
--- a/son-gtkmano/Gemfile.lock
+++ b/son-gtkmano/Gemfile.lock
@@ -118,7 +118,7 @@ GEM
       sinatra (>= 1.0)
     thread_safe (0.3.6)
     tilt (2.0.9)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     unf (0.1.4)
       unf_ext