diff --git a/ch_2/rp_examples/rp_minimal/Gemfile.lock b/ch_2/rp_examples/rp_minimal/Gemfile.lock
index a2b4acc..72616bc 100644
--- a/ch_2/rp_examples/rp_minimal/Gemfile.lock
+++ b/ch_2/rp_examples/rp_minimal/Gemfile.lock
@@ -57,8 +57,8 @@ GEM
       motion_print
       ruby_motion_query (~> 1.0)
     ruby_motion_query (1.0.0)
-    thread_safe (0.3.4)
-    tzinfo (1.2.2)
+    thread_safe (0.3.6)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     xcodeproj (0.20.2)
       activesupport (>= 3)