diff --git a/Gemfile.lock b/Gemfile.lock
index 2fbffeb..74534de 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ PATH
   remote: .
   specs:
     active_admin-awesome_nested_set (0.0.4)
-      rails (~> 3.2.5)
+      rails (>= 3.2.5, < 5.0)
 
 GEM
   remote: https://rubygems.org/
@@ -83,6 +83,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.3.3)
+    concurrent-ruby (1.1.10)
     daemons (1.1.9)
     devise (2.2.3)
       bcrypt-ruby (~> 3.0)
@@ -117,7 +118,8 @@ GEM
       rspec (~> 2.11)
     has_scope (0.5.1)
     hike (1.2.1)
-    i18n (0.6.4)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     inherited_resources (1.3.1)
       has_scope (~> 0.5.0)
       responders (~> 0.6)