diff --git a/README.md b/README.md
index 12f3991..662a70a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+<p align="center">
+  <img width="300" height="300" src="https://github.com/emq/sidekiq-lock/raw/master/logo.png">
+</p>
+
 # Sidekiq::Lock
 
 [![Code Climate](https://codeclimate.com/github/emq/sidekiq-lock.png)](https://codeclimate.com/github/emq/sidekiq-lock)
diff --git a/logo.png b/logo.png
new file mode 100644
index 0000000..e6e2c33
Binary files /dev/null and b/logo.png differ
diff --git a/sidekiq-lock.gemspec b/sidekiq-lock.gemspec
index 45c295e..0f07583 100644
--- a/sidekiq-lock.gemspec
+++ b/sidekiq-lock.gemspec
@@ -12,9 +12,8 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/emq/sidekiq-lock"
   spec.license       = "MIT"
 
-  spec.files         = `git ls-files`.split($/)
-  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
-  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+  spec.files         = Dir["lib/**/*"] + ["LICENSE.txt", "Rakefile", "README.md", "CHANGELOG.md"]
+  spec.test_files    = Dir["test/**/*"]
   spec.require_paths = ["lib"]
 
   spec.add_dependency "sidekiq", ">= 2.14.0"