diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..30ba1df
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,6 @@
+**
+
+!/Gemfile
+!/Gemfile.lock
+!/dtext_rb.gemspec
+!/lib/dtext/version.rb
diff --git a/.ruby-version b/.ruby-version
deleted file mode 100644
index ef538c2..0000000
--- a/.ruby-version
+++ /dev/null
@@ -1 +0,0 @@
-3.1.2
diff --git a/Dockerfile b/Dockerfile
index daceba1..4649a66 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM ruby:3.1.3-alpine3.17
 
 RUN apk --no-cache add build-base ragel
 
-COPY Gemfile Gemfile.lock ./
+COPY . .
 RUN gem install bundler:2.4.1 && \
   bundle install -j$(nproc)
 
diff --git a/Gemfile b/Gemfile
index efdbecc..b4e2a20 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,3 @@
-# A sample Gemfile
 source "https://rubygems.org"
 
-gem "minitest", "~> 5.10", group: :development
-gem "rake-compiler", "~> 1.0", group: :development
+gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
index cd5c36e..231b30f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,3 +1,8 @@
+PATH
+  remote: .
+  specs:
+    dtext_rb (1.10.21)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -10,6 +15,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  dtext_rb!
   minitest (~> 5.10)
   rake-compiler (~> 1.0)
 
diff --git a/VERSION b/VERSION
deleted file mode 100644
index 9de0552..0000000
--- a/VERSION
+++ /dev/null
@@ -1 +0,0 @@
-1.10.21
diff --git a/bin/dtext b/bin/dtext
deleted file mode 100755
index 05f524e..0000000
--- a/bin/dtext
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/usr/bin/env ruby
-
-require 'dtext'
-
-puts DText.parse(ARGF.read)
diff --git a/dtext_rb.gemspec b/dtext_rb.gemspec
index 2a88d57..70e1e21 100644
--- a/dtext_rb.gemspec
+++ b/dtext_rb.gemspec
@@ -1,40 +1,27 @@
 # frozen_string_literal: true
 
-Gem::Specification.new do |s|
-  s.name = "dtext_rb"
-  s.version = "1.10.21"
+require_relative "lib/dtext/version"
 
-  s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
-  s.require_paths = ["lib"]
-  s.authors = ["r888888888"]
-  s.date = "2021-07-08"
-  s.description = "Compiled DText parser"
-  s.email = "r888888888@gmail.com"
-  s.executables = ["dtext"]
-  s.extensions = ["ext/dtext/extconf.rb"]
-  s.extra_rdoc_files = [
-    "README.md"
-  ]
-  s.files = [
-    "bin/dtext",
+Gem::Specification.new do |spec|
+  spec.name = "dtext_rb"
+  spec.version = DText::VERSION
+  spec.authors = ["r888888888", "evazion", "earlopain"]
+
+  spec.summary = "E621 DText parser"
+  spec.homepage = "http://github.com/e621ng/dtext_rb"
+  spec.license = "MIT"
+  spec.required_ruby_version = ">= 3.0.0"
+  spec.extensions = ["ext/dtext/extconf.rb"]
+
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = spec.homepage
+
+  spec.files = [
     "lib/dtext.rb",
     "lib/dtext/dtext.so",
-    "lib/dtext_ruby.rb"
+    "lib/dtext/version.rb",
   ]
-  s.homepage = "http://github.com/r888888888/dtext_rb"
-  s.licenses = ["MIT"]
-  s.rubygems_version = "3.3.20"
-  s.summary = "Compiled DText parser"
 
-  if s.respond_to? :specification_version then
-    s.specification_version = 4
-  end
-
-  if s.respond_to? :add_runtime_dependency then
-    s.add_development_dependency(%q<minitest>, ["~> 5.10"])
-    s.add_development_dependency(%q<rake-compiler>, ["~> 1.0"])
-  else
-    s.add_dependency(%q<minitest>, ["~> 5.10"])
-    s.add_dependency(%q<rake-compiler>, ["~> 1.0"])
-  end
+  spec.add_development_dependency(%q<minitest>, ["~> 5.10"])
+  spec.add_development_dependency(%q<rake-compiler>, ["~> 1.0"])
 end
diff --git a/lib/dtext.rb b/lib/dtext.rb
index a3c538f..1890753 100644
--- a/lib/dtext.rb
+++ b/lib/dtext.rb
@@ -1,4 +1,5 @@
 require "dtext/dtext"
+require "dtext/version"
 
 class DText
   class Error < StandardError; end
diff --git a/lib/dtext/version.rb b/lib/dtext/version.rb
new file mode 100644
index 0000000..9dcb0ec
--- /dev/null
+++ b/lib/dtext/version.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class DText
+  VERSION = "1.10.21"
+end
diff --git a/test/dtext_test.rb b/test/dtext_test.rb
index cf97480..d1ca3fa 100644
--- a/test/dtext_test.rb
+++ b/test/dtext_test.rb
@@ -1,5 +1,5 @@
 require 'minitest/autorun'
-require 'dtext/dtext'
+require 'dtext'
 
 class DTextTest < Minitest::Test
   def assert_parse_id_link(class_name, url, input, display: input)