diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a0adf768..8cf7d526 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -92,11 +92,57 @@ jobs:
     name: "python bindings"
     steps:
       - uses: actions/checkout@v3
+      - uses: mozilla-actions/sccache-action@v0.0.3
       - name: Install stable toolchain
         uses: dtolnay/rust-toolchain@stable
+      - uses: actions/setup-python@v4
         with:
-          components: rustfmt, clippy
+          python-version: '3.11'
+          cache: 'pip'
+      - name: Build pyo3 bindings
+        run: |
+          pip install -r requirements.txt
+          cd pyrs
+          maturin build
+          pip install ../target/wheels/*.whl
+      - name: Test pyo3 bindings
+        run: |
+          cd pyrs
+          pytest
+
+  coverage:
+    if: github.event_name != 'merge_group'
+    needs: [tests, check]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
       - uses: mozilla-actions/sccache-action@v0.0.3
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: llvm-tools-preview
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+      - name: Run tests with coverage instrumentation
+        run: |
+          cargo llvm-cov clean --workspace
+          cargo llvm-cov --doctests --all-features
+          cargo llvm-cov report --codecov --output-path coverage.json
+      - name: Upload rust coverage to codecov.io
+        uses: codecov/codecov-action@v3
+        with:
+          files: coverage.json
+          name: rust
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+  py-coverage:
+    if: github.event_name != 'merge_group'
+    needs: [py-tests, check]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: mozilla-actions/sccache-action@v0.0.3
+      - name: Install stable toolchain
+        uses: dtolnay/rust-toolchain@stable
       - uses: actions/setup-python@v4
         with:
           python-version: '3.11'
@@ -104,10 +150,17 @@ jobs:
       - name: Build pyo3 bindings
         run: |
           pip install -r requirements.txt
+          pip install pytest-cov
           cd pyrs
           maturin build
           pip install ../target/wheels/*.whl
-      - name: Test pyo3 bindings
+      - name: Run python tests with coverage instrumentation
         run: |
           cd pyrs
-          pytest
\ No newline at end of file
+          pytest --cov=./ --cov-report=xml
+      - name: Upload python coverage to codecov.io
+        uses: codecov/codecov-action@v3
+        with:
+          files: pyrs/coverage.xml
+          name: python
+          token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/README.md b/README.md
index 02cc737e..daf3c96b 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,13 @@
 
 [![build_status][]](https://github.com/CQCL-DEV/tket2/actions)
 ![msrv][]
+[![codecov][]](https://codecov.io/gh/CQCL/tket2)
 
 Version 2 of the TKET compiler.
 
   [build_status]: https://github.com/CQCL-DEV/hugr/workflows/Continuous%20integration/badge.svg?branch=main
   [msrv]: https://img.shields.io/badge/rust-1.70.0%2B-blue.svg
+  [codecov]: https://img.shields.io/codecov/c/gh/CQCL/tket2?logo=codecov
 
 ## Features