diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5073223..9f33ea7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,4 +21,8 @@ jobs:
       - name: Init environment
         run: poetry install
       - name: Unit tests
-        run: poetry run pytest tests
+        run: poetry run coverage run --branch -m pytest tests
+      - name: Write coverage report
+        run: poetry run coverage xml
+      - name: Send coverage to Codecov
+        run: bash <(curl -s https://codecov.io/bash)
diff --git a/README.md b/README.md
index db2d0a9..c9b945a 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # FixedCal
 
 [![CI](https://github.com/PyryL/fixedcal/actions/workflows/main.yml/badge.svg)](https://github.com/PyryL/fixedcal/actions)
+[![codecov](https://codecov.io/gh/PyryL/fixedcal/branch/main/graph/badge.svg?token=ZMYYLBUPNA)](https://codecov.io/gh/PyryL/fixedcal)
 
 Python package for international fixed calendar dates.