diff --git a/Gemfile.lock b/Gemfile.lock
index e71074e..c57eb77 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -54,12 +54,12 @@ GEM
       url
     concurrent-ruby (1.0.5)
     crass (1.0.4)
-    docile (1.3.1)
+    docile (1.3.2)
     erubi (1.6.0)
     globalid (0.4.0)
       activesupport (>= 4.2.0)
     i18n (0.8.1)
-    json (2.1.0)
+    json (2.3.0)
     loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -101,11 +101,10 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (12.0.0)
-    simplecov (0.16.1)
+    simplecov (0.18.5)
       docile (~> 1.1)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.2)
+      simplecov-html (~> 0.11)
+    simplecov-html (0.12.1)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)