diff --git a/.codeclimate.yml b/.codeclimate.yml
deleted file mode 100644
index 4a3c6163..00000000
--- a/.codeclimate.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-version: "2"
-exclude_patterns:
-  - "integrationtests/"
-checks:
-  method-lines:
-    config:
-      threshold: 120
-  method-complexity:
-    config:
-      threshold: 15
-  return-statements:
-    enabled: false
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6b3910ef..b560af9d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -111,6 +111,14 @@ jobs:
         uses: codecov/test-results-action@v1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+      - name: Upload coverage to Qlty
+        if: ${{ matrix.os != 'windows-latest' && matrix.php_version == '8.1' && matrix.dependencies_level != '--prefer-lowest' }}
+        uses: qltysh/qlty-action/coverage@v1
+        with:
+          token: ${{ secrets.QLTY_COVERAGE_TOKEN }}
+          files: coverage.xml
+        env:
+          QLTY_COVERAGE_TOKEN: ${{ secrets.QLTY_COVERAGE_TOKEN }}
 
   slack-notify:
     needs: [run-tests, style-checks]
@@ -122,7 +130,7 @@ jobs:
         id: slack
         uses: slackapi/slack-github-action@v1.23.0
         with:
-          # Slack channel id, channel name, or user id to post message.
+          # Slack channel id, channel name, or user id to post a message.
           # See also: https://api.slack.com/methods/chat.postMessage#channels
           channel-id: '#mo4'
           # For posting a simple plain text message
diff --git a/.qlty/.gitignore b/.qlty/.gitignore
new file mode 100644
index 00000000..30366188
--- /dev/null
+++ b/.qlty/.gitignore
@@ -0,0 +1,7 @@
+*
+!configs
+!configs/**
+!hooks
+!hooks/**
+!qlty.toml
+!.gitignore
diff --git a/.qlty/configs/.yamllint.yaml b/.qlty/configs/.yamllint.yaml
new file mode 100644
index 00000000..d22fa779
--- /dev/null
+++ b/.qlty/configs/.yamllint.yaml
@@ -0,0 +1,8 @@
+rules:
+  document-start: disable
+  quoted-strings:
+    required: only-when-needed
+    extra-allowed: ["{|}"]
+  key-duplicates: {}
+  octal-values:
+    forbid-implicit-octal: true
diff --git a/.qlty/qlty.toml b/.qlty/qlty.toml
new file mode 100644
index 00000000..3fbf1b19
--- /dev/null
+++ b/.qlty/qlty.toml
@@ -0,0 +1,84 @@
+# This file was automatically generated by `qlty init`.
+# You can modify it to suit your needs.
+# We recommend you to commit this file to your repository.
+#
+# This configuration is used by both Qlty CLI and Qlty Cloud.
+#
+#     Qlty CLI -- Code quality toolkit for developers
+#     Qlty Cloud -- Fully automated Code Health Platform
+#
+# Try Qlty Cloud: https://qlty.sh
+#
+# For a guide to configuration, visit https://qlty.sh/d/config
+# Or for a full reference, visit https://qlty.sh/d/qlty-toml
+config_version = "0"
+
+exclude_patterns = [
+  "*_min.*",
+  "*-min.*",
+  "*.min.*",
+  "**/.yarn/**",
+  "**/*.d.ts",
+  "**/assets/**",
+  "**/bower_components/**",
+  "**/build/**",
+  "**/cache/**",
+  "**/config/**",
+  "**/db/**",
+  "**/deps/**",
+  "**/dist/**",
+  "**/extern/**",
+  "**/external/**",
+  "**/generated/**",
+  "**/Godeps/**",
+  "**/gradlew/**",
+  "**/mvnw/**",
+  "**/node_modules/**",
+  "**/protos/**",
+  "**/seed/**",
+  "**/target/**",
+  "**/templates/**",
+  "**/testdata/**",
+  "**/vendor/**", "integrationtests/",
+]
+
+test_patterns = [
+  "**/test/**",
+  "**/spec/**",
+  "**/*.test.*",
+  "**/*.spec.*",
+  "**/*_test.*",
+  "**/*_spec.*",
+  "**/test_*.*",
+  "**/spec_*.*",
+]
+
+[smells]
+mode = "comment"
+
+[smells.boolean_logic]
+threshold = 4
+
+[smells.file_complexity]
+threshold = 55
+
+[smells.return_statements]
+threshold = 4
+enabled = false
+
+[smells.nested_control_flow]
+threshold = 4
+
+[smells.function_parameters]
+threshold = 4
+
+[smells.function_complexity]
+threshold = 16
+
+[smells.duplication]
+enabled = true
+threshold = 20
+
+[[source]]
+name = "default"
+default = true
diff --git a/README.md b/README.md
index b45e51e3..10b07379 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Provides a PHP CodeSniffer ruleset for the MO4 coding standard
 
 [![Build Status](https://github.com/mayflower/mo4-coding-standard/actions/workflows/ci.yml/badge.svg)](https://github.com/mayflower/mo4-coding-standard/actions)
 [![Code Coverage](https://codecov.io/gh/mayflower/mo4-coding-standard/branch/master/graph/badge.svg)](https://codecov.io/gh/mayflower/mo4-coding-standard/branch/master/)
-[![Codeclimate Maintainability](https://api.codeclimate.com/v1/badges/16114548a0315d993868/maintainability)](https://codeclimate.com/github/mayflower/mo4-coding-standard/maintainability)
+[![Qlty Maintainability](https://qlty.sh/gh/mayflower/projects/mo4-coding-standard/maintainability.svg)](https://qlty.sh/gh/mayflower/projects/mo4-coding-standard)
 [![SonarQube Maintainability](https://sonarcloud.io/api/project_badges/measure?project=mayflower_mo4-coding-standard&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=mayflower_mo4-coding-standard)
 
 [![Latest Stable Version](https://poser.pugx.org/mayflower/mo4-coding-standard/v/stable)](https://packagist.org/packages/mayflower/mo4-coding-standard)