diff --git a/.gitignore b/.gitignore
index 2cc94c7..32c314a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,11 @@
 _site
 vendor
 
+# rubygem
+*.gem
+# yard docs
+doc
+
 # npm dependencies
 node_modules
 package-lock.json
diff --git a/Gemfile b/Gemfile
index 2c6581e..54686cc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,18 +1,18 @@
 source "https://rubygems.org"
 
-gem "jekyll", ">= 4.1.0", "< 5.0"
+gem "jekyll", "~> 4.1"
 
 # plugins
 group :jekyll_plugins do
-  gem "jekyll-paginate"
-  gem "jekyll-redirect-from"
-  gem "jekyll-seo-tag"
-  gem "jekyll-archives"
-  gem "jekyll-sitemap"
+  gem "jekyll-paginate", "~> 1.1"
+  gem "jekyll-redirect-from", "~> 0.16"
+  gem "jekyll-seo-tag", "~> 2.7"
+  gem "jekyll-archives", "~> 2.2"
+  gem "jekyll-sitemap", "~> 1.4"
 end
 
 group :test do
-  gem "html-proofer"
+  gem "html-proofer", "~> 3.18"
 end
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
diff --git a/Gemfile.lock b/Gemfile.lock
index 5f9d07f..d129072 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -98,16 +98,16 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  html-proofer
-  jekyll (>= 4.1.0, < 5.0)
-  jekyll-archives
-  jekyll-paginate
-  jekyll-redirect-from
-  jekyll-seo-tag
-  jekyll-sitemap
+  html-proofer (~> 3.18)
+  jekyll (~> 4.1)
+  jekyll-archives (~> 2.2)
+  jekyll-paginate (~> 1.1)
+  jekyll-redirect-from (~> 0.16)
+  jekyll-seo-tag (~> 2.7)
+  jekyll-sitemap (~> 1.4)
   tzinfo (~> 1.2)
   tzinfo-data
   wdm (~> 0.1.1)
 
 BUNDLED WITH
-   2.1.4
+   2.2.4
diff --git a/jekyll-theme-chirpy.gemspec b/jekyll-theme-chirpy.gemspec
new file mode 100644
index 0000000..488baea
--- /dev/null
+++ b/jekyll-theme-chirpy.gemspec
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+Gem::Specification.new do |spec|
+  spec.name          = "jekyll-theme-chirpy"
+  spec.version       = "2.7.2"
+  spec.authors       = ["Cotes Chung"]
+  spec.email         = ["cotes.chung@gmail.com"]
+
+  spec.summary       = "Chirpy is a minimal, sidebar, responsive web design Jekyll theme that focuses on text presentation."
+  spec.homepage      = "https://github.com/cotes2020/jekyll-theme-chirpy#readme"
+  spec.license       = "MIT"
+
+  spec.files         = `git ls-files -z`.split("\x0").select { |f|
+    f.match(%r!^((assets\/(css|img|js\/[a-z])|_(includes|layouts|sass|config|data|tabs|plugins))|README|LICENSE|index|feed|app|sw|404|robots)!i)
+  }
+
+  spec.add_runtime_dependency "jekyll", "~> 4.1"
+  spec.add_runtime_dependency "jekyll-paginate", "~> 1.1"
+  spec.add_runtime_dependency "jekyll-redirect-from", "~> 0.16"
+  spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.7"
+  spec.add_runtime_dependency "jekyll-archives", "~> 2.2"
+  spec.add_runtime_dependency "jekyll-sitemap", "~> 1.4"
+
+  spec.add_development_dependency "html-proofer", "~> 3.18"
+
+end