diff --git a/Gemfile.lock b/Gemfile.lock
index c099ab4..c002f63 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,8 +18,8 @@ GEM
   remote: https://rubygems.org/
   specs:
     RedCloth (4.2.9)
-    activesupport (3.2.6)
-      i18n (~> 0.6)
+    activesupport (3.2.22.5)
+      i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
     blankslate (2.1.2.4)
     builder (3.0.0)
@@ -28,6 +28,7 @@ GEM
       chunky_png (~> 1.2)
       fssm (>= 0.2.7)
       sass (~> 3.1)
+    concurrent-ruby (1.1.10)
     doc_raptor (0.3.2)
       httparty (>= 0.7.0)
     eeepub-with-cover-support (0.8.7)
@@ -38,8 +39,9 @@ GEM
     httparty (0.8.3)
       multi_json (~> 1.0)
       multi_xml
-    i18n (0.6.0)
-    multi_json (1.3.6)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    multi_json (1.15.0)
     multi_xml (0.4.4)
     nokogiri (1.5.4)
     notifier (0.2.1)