diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 814fd9d..c1b3a89 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -46,7 +46,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-latest
           - os: ubuntu-24.04-arm
           - os: windows-latest
           - os: macos-latest
@@ -58,6 +57,27 @@ jobs:
       - uses: ./.github/actions/setup_rye
       - run: rye test -a
 
+  pytest-cov:
+    name: Run tests and collect coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+
+      - name: Setup rye
+        uses: ./.github/actions/setup_rye
+
+      - name: Run tests
+        run: rye test -a -- --cov --cov-branch --cov-report=xml
+
+      - name: Upload results to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+
   docs:
     name: Documentation build
     runs-on: ubuntu-latest
@@ -78,6 +98,7 @@ jobs:
       - pre-commit
       - mypy
       - pytest
+      - pytest-cov
       - docs
 
     runs-on: ubuntu-latest
diff --git a/.gitignore b/.gitignore
index fe94ef5..bf5055a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,7 @@ requirements-dev.lock
 
 # rye is the primary tool, uv is only used for on-the-fly setups
 uv.lock
+
+# coverage files
+.coverage
+coverage.xml
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 146b24e..150dd9a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -21,4 +21,4 @@ repos:
     hooks:
       - id: taplo-format
       # lint fetches schemas online at each call, deactivate for now
-      - id: taplo-lint
+      # - id: taplo-lint # excluded because json is fetched online and not reachable (503)