diff --git a/Gemfile.lock b/Gemfile.lock
index b78908c..8c6de09 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,7 @@ GEM
     mime-types (2.2)
     mini_portile (0.6.1)
     minitest (5.4.3)
-    multi_json (1.10.1)
+    multi_json (1.14.1)
     nokogiri (1.6.4.1)
       mini_portile (~> 0.6.0)
     padrino-helpers (0.12.4)
@@ -102,7 +102,7 @@ GEM
     padrino-support (0.12.4)
       activesupport (>= 3.1)
     puma (3.12.2)
-    rack (1.6.4)
+    rack (1.6.11)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.2)
@@ -121,7 +121,7 @@ GEM
       diff-lcs (>= 1.1.3, < 2.0)
     rspec-mocks (2.14.6)
     sass (3.4.8)
-    sprockets (2.12.3)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)