diff --git a/Gemfile.lock b/Gemfile.lock
index 59f1974..e236f9d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
       sprockets-helpers (~> 1.1.0)
       sprockets-sass (~> 1.3.0)
     minitest (5.5.1)
-    multi_json (1.11.0)
+    multi_json (1.15.0)
     nenv (0.2.0)
     notiffany (0.0.6)
       nenv (~> 0.1)
@@ -126,7 +126,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.6.0)
+    rack (1.6.13)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.3)
@@ -143,7 +143,7 @@ GEM
       temple (~> 0.7.3)
       tilt (>= 1.3.3, < 2.1)
     slop (3.6.0)
-    sprockets (2.12.3)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)