diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 430717d..404f2db 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -113,3 +113,11 @@ jobs:
 
       - name: Run tests
         run: pytest
+
+      - name: Upload coverage to Codecov
+        if: runner.os == 'Linux'
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage.xml
+          fail_ci_if_error: true
diff --git a/README.md b/README.md
index d8faa76..9c7a36e 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # MUSE2 data analysis
 
+[![codecov](https://codecov.io/gh/EnergySystemsModellingLab/muse2_data_analysis/graph/badge.svg?token=0B706BGSJ8)](https://codecov.io/gh/EnergySystemsModellingLab/muse2_data_analysis)
+
 > :warning: **Note that this repository is currently a work in progress.** :warning:
 
 This repository contains Python scripts and Jupyter notebooks for analysing and