diff --git a/ch_2/rp_examples/rp_picker/Gemfile.lock b/ch_2/rp_examples/rp_picker/Gemfile.lock
index a2b4acc..876bac4 100644
--- a/ch_2/rp_examples/rp_picker/Gemfile.lock
+++ b/ch_2/rp_examples/rp_picker/Gemfile.lock
@@ -3,11 +3,10 @@ GEM
   specs:
     ProMotion (2.2.0)
       methadone (~> 1.7)
-    activesupport (4.2.0)
-      i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
+    activesupport (5.2.8.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     claide (0.7.0)
     cocoapods (0.35.0)
@@ -36,13 +35,14 @@ GEM
       netrc (= 0.7.8)
     cocoapods-try (0.4.3)
     colored (1.2)
+    concurrent-ruby (1.1.10)
     escape (0.0.4)
     fuzzy_match (2.0.4)
-    i18n (0.7.0)
-    json (1.8.2)
+    i18n (1.12.0)
+      concurrent-ruby (~> 1.0)
     methadone (1.8.0)
       bundler
-    minitest (5.5.1)
+    minitest (5.17.0)
     molinillo (0.1.2)
     motion-cocoapods (1.7.0)
       cocoapods (>= 0.34)
@@ -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)