diff --git a/Gemfile.lock b/Gemfile.lock
index 1288d067..ecc7ec98 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -124,6 +124,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
+    concurrent-ruby (1.0.5)
     countable-rails (0.0.1)
       railties (>= 3.1)
     countries (1.2.5)
@@ -220,7 +221,6 @@ GEM
       sysexits (~> 1.1)
     hashdiff (0.3.4)
     hashie (3.5.5)
-    hike (1.2.3)
     hoptoad_notifier (2.4.11)
       activesupport
       builder
@@ -497,11 +497,9 @@ GEM
     spring (1.6.3)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (2.11.3)
-      hike (~> 1.2)
-      multi_json (~> 1.0)
-      rack (~> 1.0)
-      tilt (~> 1.1, != 1.3.0)
+    sprockets (3.7.1)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
     sprockets-rails (2.3.3)
       actionpack (>= 3.0)
       activesupport (>= 3.0)