diff --git a/Gemfile b/Gemfile
index d477847..8047b95 100644
--- a/Gemfile
+++ b/Gemfile
@@ -44,7 +44,7 @@ group :test do
   gem "nyan-cat-formatter", require: false
 
   # test coverage
-  gem "simplecov",                 "0.14.1",   require: false
+  gem "simplecov",                 "0.15.0",   require: false
   gem "simplecov-rcov",            "0.2.3",    require: false
 
   # test helpers
diff --git a/Gemfile.lock b/Gemfile.lock
index cf91f24..47b9ed3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -196,11 +196,11 @@ GEM
       addressable (>= 2.3.5, < 2.6)
       faraday (~> 0.8, < 1.0)
     shellany (0.0.1)
-    simplecov (0.14.1)
+    simplecov (0.15.0)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.1)
+    simplecov-html (0.10.2)
     simplecov-rcov (0.2.3)
       simplecov (>= 0.4.1)
     slop (3.6.0)
@@ -253,7 +253,7 @@ DEPENDENCIES
   rspec-json_expectations (~> 2.1)
   rspec-rails (~> 3.6.0)
   rubocop (= 0.49.1)
-  simplecov (= 0.14.1)
+  simplecov (= 0.15.0)
   simplecov-rcov (= 0.2.3)
   spring
   spring-commands-rspec