diff --git a/.codeclimate.yml b/.codeclimate.yml
deleted file mode 100644
index a933d49..0000000
--- a/.codeclimate.yml
+++ /dev/null
@@ -1,18 +0,0 @@
-version: "2"
-prepare:
-  fetch:
-    - url: https://raw.githubusercontent.com/rggen/rggen-devtools/master/config/rubocop_common.yml
-      path: rubocop_common.yml
-plugins:
-  duplication:
-    enabled: true
-    config:
-      languages:
-      - ruby:
-  fixme:
-    enabled: true
-  rubocop:
-    enabled: true
-    channel: beta
-exclude_patterns:
-  - "spec/"
diff --git a/.qlty/qlty.toml b/.qlty/qlty.toml
new file mode 100644
index 0000000..89054a0
--- /dev/null
+++ b/.qlty/qlty.toml
@@ -0,0 +1,21 @@
+config_version = "0"
+
+exclude_patterns = [
+  "**/.github/**",
+  "**/spec/**"
+]
+
+test_patterns = [
+  "**/spec/**"
+]
+
+[[source]]
+name = "default"
+default = true
+
+[smells]
+mode = "comment"
+
+[[plugin]]
+name = "rubocop"
+version = "1.64.0"
diff --git a/.rubocop.yml b/.rubocop.yml
index 5f8c93a..ab8cf3a 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,6 +1,6 @@
-<% if File.exist?('rubocop_common.yml') %>
+<% if Gem::Specification.find_all_by_name('rggen-devtools').empty? %>
 inherit_from:
-  - rubocop_common.yml
+  - https://raw.githubusercontent.com/rggen/rggen-devtools/master/config/rubocop_common.yml
   - .rubocop_todo.yml
 <% else %>
 inherit_gem:
diff --git a/README.md b/README.md
index 9df78ef..7ea5ea3 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 [![Gem Version](https://badge.fury.io/rb/rggen-markdown.svg)](https://badge.fury.io/rb/rggen-markdown)
 [![CI](https://github.com/rggen/rggen-markdown/workflows/CI/badge.svg)](https://github.com/rggen/rggen-markdown/actions?query=workflow%3ACI)
-[![Maintainability](https://api.codeclimate.com/v1/badges/5bbd7d84fefb30c5ee9a/maintainability)](https://codeclimate.com/github/rggen/rggen-markdown/maintainability)
+[![Maintainability](https://qlty.sh/badges/c7a4da9b-9276-459d-adc0-89582cb7d4cf/maintainability.svg)](https://qlty.sh/gh/rggen/projects/rggen-markdown)
 [![codecov](https://codecov.io/gh/rggen/rggen-markdown/branch/master/graph/badge.svg)](https://codecov.io/gh/rggen/rggen-markdown)
 [![Gitter](https://badges.gitter.im/rggen/rggen.svg)](https://gitter.im/rggen/rggen?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)