diff --git a/Gemfile.lock b/Gemfile.lock
index a9d3cbd..e198e78 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -90,7 +90,7 @@ GEM
       sprockets-helpers (~> 1.1.0)
       sprockets-sass (~> 1.3.0)
     minitest (5.8.0)
-    multi_json (1.11.2)
+    multi_json (1.14.1)
     padrino-helpers (0.12.5)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.12.5)
@@ -101,7 +101,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.6.4)
+    rack (1.6.11)
     rack-livereload (0.3.16)
       rack
     rack-test (0.6.3)
@@ -112,7 +112,7 @@ GEM
       ffi (>= 0.5.0)
     sass (3.4.18)
     slop (3.6.0)
-    sprockets (2.12.4)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)