diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 504b2df..1813416 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,11 +12,14 @@ jobs:
       - name: Setup Bun Environment
         uses: oven-sh/setup-bun@v1
         with:
-          bun-version: 1.1.6
+          bun-version: 1.1.17
 
       - name: Install dependencies
-        run: bun install
+        run: |
+          bun install
+          bun install lcov-parse
 
+        # outputs coverage/lcov.info
       - name: Run tests
         env:
           DEV_MODE: true
@@ -29,11 +32,15 @@ jobs:
           GITHUB_APP_ID: ${{ secrets.GH_APP_ID }}
           GITHUB_APP_PRIVATE_KEY: ${{ secrets.GH_APP_PRIVATE_KEY }}
           GITHUB_APP_WEBHOOK_SECRET: ${{ secrets.GH_APP_WEBHOOK_SECRET }}
-        run: bun test --coverage
-
-      # TODO: waiting for bun to support coverage report formats
-      #- name: Update Coverage Badge
-      #  # GitHub actions: default branch variable
-      #  # https://stackoverflow.com/questions/64781462/github-actions-default-branch-variable
-      #  if: github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
-      #  uses: we-cli/coverage-badge-action@main
+        run: bun test --coverage --coverage-reporter lcov --coverage-dir coverage
+
+        # generate coverage-summary.json from lcov.info
+      - name: Generate Coverage Summary
+        run: lcov-parse ./coverage/lcov.info > coverage/coverage-summary.json
+
+        # requires ./coverage/coverage-summary.json
+      - name: Update Coverage Badge
+        # GitHub actions: default branch variable
+        # https://stackoverflow.com/questions/64781462/github-actions-default-branch-variable
+        if: github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        uses: we-cli/coverage-badge-action@main
diff --git a/README.md b/README.md
index 932db4d..f726dde 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Open <http://localhost:3000/> with your browser to see the result.
 
 ### Testing
 
-[![cov](https://propromo-software.github.io/propromo.rest/badges/coverage.svg)](https://github.com/propromo-software/propromo.rest/actions/workflows/ci.yml)
+[![cov](https://propromo-software.github.io/propromo.rest/badges/coverage.svg)](https://github.com/propromo-software/propromo.rest/actions)
 
 ```bash
 bun test