diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index ba1f94f..9882260 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -1,48 +1,61 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
 on:
   push:
-    branches:
-      - main
-      - master
+    branches: [main, master]
   pull_request:
-    branches:
-      - main
-      - master
+    branches: [main, master]
 
-name: test-coverage
+name: test-coverage.yaml
+
+permissions: read-all
 
 jobs:
   test-coverage:
-    runs-on: macOS-latest
+    runs-on: ubuntu-latest
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - uses: r-lib/actions/setup-r@v1
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
 
-      - uses: r-lib/actions/setup-pandoc@v1
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: any::covr, any::xml2
+          needs: coverage
 
-      - name: Query dependencies
+      - name: Test coverage
         run: |
-          install.packages('remotes')
-          saveRDS(remotes::dev_package_deps(dependencies = TRUE), ".github/depends.Rds", version = 2)
-          writeLines(sprintf("R-%i.%i", getRversion()$major, getRversion()$minor), ".github/R-version")
+          cov <- covr::package_coverage(
+            quiet = FALSE,
+            clean = FALSE,
+            install_path = file.path(normalizePath(Sys.getenv("RUNNER_TEMP"), winslash = "/"), "package")
+          )
+          covr::to_cobertura(cov)
         shell: Rscript {0}
 
-      - name: Restore R package cache
-        uses: actions/cache@v2
+      - uses: codecov/codecov-action@v4
         with:
-          path: ${{ env.R_LIBS_USER }}
-          key: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-${{ hashFiles('.github/depends.Rds') }}
-          restore-keys: ${{ runner.os }}-${{ hashFiles('.github/R-version') }}-1-
-
-      - name: Install dependencies
+          fail_ci_if_error: ${{ github.event_name != 'pull_request' && true || false }}
+          file: ./cobertura.xml
+          plugin: noop
+          disable_search: true
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+      - name: Show testthat output
+        if: always()
         run: |
-          install.packages(c("remotes"))
-          remotes::install_deps(dependencies = TRUE)
-          remotes::install_cran("covr")
-        shell: Rscript {0}
+          ## --------------------------------------------------------------------
+          find '${{ runner.temp }}/package' -name 'testthat.Rout*' -exec cat '{}' \; || true
+        shell: bash
 
-      - name: Test coverage
-        run: covr::codecov()
-        shell: Rscript {0}
+      - name: Upload test results
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-test-failures
+          path: ${{ runner.temp }}/package
diff --git a/README.md b/README.md
index daa2f10..d7f0283 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # amerifluxr <img src='man/figures/logo.png' align="right" height="138.5" />
 
 [![R-CMD-check](https://github.com/chuhousen/amerifluxr/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/chuhousen/amerifluxr/actions/workflows/R-CMD-check.yaml)
-[![codecov](https://codecov.io/gh/chuhousen/amerifluxr/branch/master/graph/badge.svg)](https://codecov.io/gh/chuhousen/amerifluxr)
+ [![Codecov test coverage](https://codecov.io/gh/chuhousen/amerifluxr/graph/badge.svg)](https://app.codecov.io/gh/chuhousen/amerifluxr)
 [![CRAN\_Status\_Badge](https://www.r-pkg.org/badges/version/amerifluxr)](https://cran.r-project.org/package=amerifluxr)
 ![CRAN\_Downloads](https://cranlogs.r-pkg.org/badges/grand-total/amerifluxr)