diff --git a/Gemfile b/Gemfile
index d454f6993..98d43d08e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -258,7 +258,7 @@ group :development do
   gem "pry-byebug"
 
   # test coverage
-  gem "simplecov", "0.11.2", require: false
+  gem "simplecov", "0.12.0", require: false
 
   gem "turbo_dev_assets", "0.0.2"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index f5460e628..26cd18a4c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -135,12 +135,12 @@ GEM
     concurrent-ruby (1.0.2)
     configurate (0.3.1)
     connection_pool (2.2.0)
-    coveralls (0.8.13)
-      json (~> 1.8)
-      simplecov (~> 0.11.0)
+    coveralls (0.8.15)
+      json (>= 1.8, < 3)
+      simplecov (~> 0.12.0)
       term-ansicolor (~> 1.3)
       thor (~> 0.19.1)
-      tins (~> 1.6.0)
+      tins (>= 1.6.0, < 2)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     cucumber (2.4.0)
@@ -792,9 +792,9 @@ GEM
     simple_captcha2 (0.4.0)
       rails (>= 4.1)
     simple_oauth (0.3.1)
-    simplecov (0.11.2)
+    simplecov (0.12.0)
       docile (~> 1.1.0)
-      json (~> 1.8)
+      json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.0)
     sinatra (1.4.7)
@@ -839,7 +839,7 @@ GEM
     timecop (0.8.1)
     timers (4.1.1)
       hitimes
-    tins (1.6.0)
+    tins (1.12.0)
     trollop (2.1.2)
     turbo_dev_assets (0.0.2)
     twitter (5.16.0)
@@ -1025,7 +1025,7 @@ DEPENDENCIES
   sidekiq (= 4.1.4)
   sidekiq-cron (= 0.4.2)
   simple_captcha2 (= 0.4.0)
-  simplecov (= 0.11.2)
+  simplecov (= 0.12.0)
   sinatra (= 1.4.7)
   sinon-rails (= 1.15.0)
   spring (= 1.7.1)