diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 03e3551..749a393 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -261,6 +261,36 @@ jobs:
         docker push ghcr.io/$image_name
 
 
+    - name: Upload unit-test coverage to Codecov
+      uses: codecov/codecov-action@v5  # https://github.com/codecov/codecov-action
+      if: ${{ github.ref_name == 'main' || github.event_name == 'pull_request' }}
+      with:
+        files: .temp/coverage-unit.xml
+        flags: unit-tests
+        env_vars: OS,PYTHON
+        name: gha-u-${{ matrix.PYTHON_VERSION }}-${{ matrix.os }}
+      env:
+        OS: ${{ matrix.os }}
+        PYTHON: ${{ matrix.PYTHON_VERSION }}
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+        slug: ${{ github.repository }}
+
+
+    - name: Upload integration-test coverage to Codecov
+      uses: codecov/codecov-action@v5  # https://github.com/codecov/codecov-action
+      if: ${{ github.ref_name == 'main' || github.event_name == 'pull_request' }}
+      with:
+        files: .temp/coverage-integration.xml
+        flags: integration-tests
+        env_vars: OS,PYTHON
+        name: gha-i-${{ matrix.PYTHON_VERSION }}-${{ matrix.os }}
+      env:
+        OS: ${{ matrix.os }}
+        PYTHON: ${{ matrix.PYTHON_VERSION }}
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+        slug: ${{ github.repository }}
+
+
   ###########################################################
   publish-release:
   ###########################################################
diff --git a/README.md b/README.md
index 20496e2..d10a496 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,8 @@
 [![Build Status](https://github.com/Second-Hand-Friends/kleinanzeigen-bot/actions/workflows/build.yml/badge.svg)](https://github.com/Second-Hand-Friends/kleinanzeigen-bot/actions/workflows/build.yml)
 [![License](https://img.shields.io/github/license/Second-Hand-Friends/kleinanzeigen-bot.svg?color=blue)](LICENSE.txt)
 [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-v2.1%20adopted-ff69b4.svg)](CODE_OF_CONDUCT.md)
-[![Maintainability](https://api.codeclimate.com/v1/badges/77b4ed9cc0dd8cfe373c/maintainability)](https://codeclimate.com/github/Second-Hand-Friends/kleinanzeigen-bot/maintainability)
+[![codecov](https://codecov.io/github/Second-Hand-Friends/kleinanzeigen-bot/graph/badge.svg?token=SKLDTVWHVK)](https://codecov.io/github/Second-Hand-Friends/kleinanzeigen-bot)
+<!--[![Maintainability](https://qlty.sh/badges/69ff94b8-90e1-4096-91ed-3bcecf0b0597/maintainability.svg)](https://qlty.sh/gh/Second-Hand-Friends/projects/kleinanzeigen-bot)-->
 
 **Feedback and high-quality pull requests are highly welcome!**
 
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..9f58c70
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,12 @@
+# https://docs.codecov.com/docs/codecovyml-reference
+# https://json.schemastore.org/codecov.json
+codecov:
+  branch: main
+  require_ci_to_pass: true
+  notify:
+    wait_for_ci: true
+
+coverage:
+  precision: 2
+  round: down
+  range: "65...100"
diff --git a/pyproject.toml b/pyproject.toml
index fd8cb30..5bd05ff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -336,7 +336,10 @@ filterwarnings = [
 ]
 
 [tool.coverage.run]
+# https://coverage.readthedocs.io/en/latest/config.html#run
 data_file = ".temp/coverage.sqlite"
+branch = true  # track branch coverage
+relative_files = true
 
 
 #####################