diff --git a/Gemfile b/Gemfile
index 911365e..e084db3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -45,7 +45,7 @@ group :test do
 
   # test coverage
   gem "codeclimate-test-reporter", "~> 1.0.0", require: false
-  gem "simplecov",                 "0.12.0",   require: false
+  gem "simplecov",                 "0.13.0",   require: false
   gem "simplecov-rcov",            "0.2.3",    require: false
 
   # test helpers
diff --git a/Gemfile.lock b/Gemfile.lock
index ed28887..ed975f1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -243,7 +243,7 @@ GEM
       addressable (>= 2.3.5, < 2.6)
       faraday (~> 0.8, < 1.0)
     shellany (0.0.1)
-    simplecov (0.12.0)
+    simplecov (0.13.0)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
@@ -311,7 +311,7 @@ DEPENDENCIES
   rspec-core (~> 3.5.1)
   rspec-rails (~> 3.5.1)
   rubocop (= 0.47.1)
-  simplecov (= 0.12.0)
+  simplecov (= 0.13.0)
   simplecov-rcov (= 0.2.3)
   spring
   spring-commands-rspec