diff --git a/fluent-plugin-kubernetes-sumologic/Gemfile b/fluent-plugin-kubernetes-sumologic/Gemfile
index 9342b364..be633cf4 100644
--- a/fluent-plugin-kubernetes-sumologic/Gemfile
+++ b/fluent-plugin-kubernetes-sumologic/Gemfile
@@ -1,9 +1,7 @@
 source 'https://rubygems.org'
 
 group :test do
-  gem 'codecov'
-  gem 'simplecov'
   gem 'webmock'
 end
 
-gemspec
\ No newline at end of file
+gemspec
diff --git a/fluent-plugin-kubernetes-sumologic/Gemfile.lock b/fluent-plugin-kubernetes-sumologic/Gemfile.lock
index 76263cf7..7f7f26cd 100644
--- a/fluent-plugin-kubernetes-sumologic/Gemfile.lock
+++ b/fluent-plugin-kubernetes-sumologic/Gemfile.lock
@@ -10,14 +10,10 @@ GEM
   specs:
     addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
-    codecov (0.2.12)
-      json
-      simplecov
     concurrent-ruby (1.1.10)
     cool.io (1.7.1)
     crack (0.4.5)
       rexml
-    docile (1.4.0)
     fluentd (1.16.2)
       bundler
       cool.io (>= 1.4.5, < 2.0.0)
@@ -33,7 +29,6 @@ GEM
     hashdiff (1.0.1)
     http_parser.rb (0.8.0)
     httpclient (2.8.3)
-    json (2.6.3)
     msgpack (1.5.1)
     power_assert (2.0.3)
     public_suffix (5.0.3)
@@ -42,12 +37,6 @@ GEM
     serverengine (2.3.2)
       sigdump (~> 0.2.2)
     sigdump (0.2.5)
-    simplecov (0.22.0)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11)
-      simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.12.3)
-    simplecov_json_formatter (0.1.4)
     strptime (0.2.5)
     test-unit (3.6.1)
       power_assert
@@ -67,12 +56,10 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (~> 2)
-  codecov
   fluent-plugin-kubernetes-sumologic!
   rake
-  simplecov
   test-unit (~> 3.6.0)
   webmock
 
 BUNDLED WITH
-   2.4.1
+   2.4.19
diff --git a/fluent-plugin-kubernetes-sumologic/fluent-plugin-kubernetes-sumologic.gemspec b/fluent-plugin-kubernetes-sumologic/fluent-plugin-kubernetes-sumologic.gemspec
index 25dc9072..baca2e85 100644
--- a/fluent-plugin-kubernetes-sumologic/fluent-plugin-kubernetes-sumologic.gemspec
+++ b/fluent-plugin-kubernetes-sumologic/fluent-plugin-kubernetes-sumologic.gemspec
@@ -21,7 +21,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 2"
   spec.add_development_dependency "rake"
   spec.add_development_dependency 'test-unit', '~> 3.6.0'
-  spec.add_development_dependency "codecov", ">= 0.1.10"
   spec.add_runtime_dependency "fluentd", "= 1.16.2"
   spec.add_runtime_dependency 'httpclient', '~> 2.8.0'
 end
diff --git a/fluent-plugin-kubernetes-sumologic/test/helper.rb b/fluent-plugin-kubernetes-sumologic/test/helper.rb
index 5a12ee9c..46cfa10c 100644
--- a/fluent-plugin-kubernetes-sumologic/test/helper.rb
+++ b/fluent-plugin-kubernetes-sumologic/test/helper.rb
@@ -1,11 +1,3 @@
-require "simplecov"
-SimpleCov.start
-
-if ENV["CI"] == "true"
-  require "codecov"
-  SimpleCov.formatter = SimpleCov::Formatter::Codecov
-end
-
 $LOAD_PATH.unshift(File.expand_path("../../", __FILE__))
 require "test-unit"
 require "fluent/test"