diff --git a/Gemfile.lock b/Gemfile.lock
index e931819..689a4c6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,12 +88,12 @@ GEM
       rubocop (~> 1.19)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
-    simplecov (0.21.2)
+    simplecov (0.22.0)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
-    simplecov_json_formatter (0.1.3)
+    simplecov_json_formatter (0.1.4)
     unicode-display_width (2.1.0)
     webmock (3.18.1)
       addressable (>= 2.8.0)
@@ -113,7 +113,7 @@ DEPENDENCIES
   rubocop (~> 1.28.2)
   rubocop-rake (~> 0.6.0)
   rubocop-rspec (~> 2.6)
-  simplecov (~> 0.21.2)
+  simplecov (~> 0.22.0)
   webmock (~> 3.1)
 
 BUNDLED WITH
diff --git a/mrkt.gemspec b/mrkt.gemspec
index 52e04a9..303d67b 100644
--- a/mrkt.gemspec
+++ b/mrkt.gemspec
@@ -32,6 +32,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop', '~> 1.28.2'
   spec.add_development_dependency 'rubocop-rake', '~> 0.6.0'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.6'
-  spec.add_development_dependency 'simplecov', '~> 0.21.2'
+  spec.add_development_dependency 'simplecov', '~> 0.22.0'
   spec.add_development_dependency 'webmock', '~> 3.1'
 end