diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 1c27f6e..4ef94a1 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -27,7 +27,15 @@ jobs:
 
       - name: Run API tests
         run: |
-          task --yes api:test
+          task --yes api:test:coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v7
+        with:
+          files: ./coverage/unit.xml
+          flags: unittests
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   code-analysis-phpstan:
     runs-on: ubuntu-latest
diff --git a/.gitignore b/.gitignore
index e34bf05..6b0cf92 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,3 +36,6 @@ phpstan.neon
 ###> claude-code ###
 /.claude/settings.local.json
 ###< claude-code ###
+
+# Coverage reports (generated in CI, uploaded to Codecov).
+/coverage
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 574c735..651abee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ See [keep a changelog] for information about writing changes to this log.
 
 ## [Unreleased]
 
+- [PR-37](https://github.com/itk-dev/event-database-api/pull/37)
+  Upload test coverage to Codecov in CI
 - [PR-36](https://github.com/itk-dev/event-database-api/pull/36)
   Add unit tests pinning the Elasticsearch filters' query DSL and parameter descriptors
 - [PR-35](https://github.com/itk-dev/event-database-api/pull/35)
diff --git a/Taskfile.yml b/Taskfile.yml
index f4c0a9a..2cd8f36 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -182,6 +182,13 @@ tasks:
         vars:
           COMPOSE_ARGS: exec phpfpm bin/phpunit
 
+  api:test:coverage:
+    desc: Run API tests with a Clover coverage report (coverage/unit.xml)
+    cmds:
+      - task: compose
+        vars:
+          COMPOSE_ARGS: exec --env XDEBUG_MODE=coverage phpfpm bin/phpunit --coverage-clover=coverage/unit.xml
+
   api:spec:export:
     desc: Export API spec
     cmds: