diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index fe97a03..2f959bb 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -1,6 +1,6 @@
 name: Run unit tests
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
@@ -21,3 +21,5 @@ jobs:
     - name: Run Tox
       # Run tox using the version of Python in `PATH`
       run: tox -e py
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v1