diff --git a/.github/codecov.yml b/.github/codecov.yml
new file mode 100644
index 00000000..81ea2203
--- /dev/null
+++ b/.github/codecov.yml
@@ -0,0 +1,20 @@
+# ref: https://docs.codecov.com/docs/codecovyml-reference
+coverage:
+  range: 85..100
+  round: down
+  precision: 1
+  status:
+    # ref: https://docs.codecov.com/docs/commit-status
+    project:
+      default:
+        # Avoid false negatives
+        threshold: 1%
+
+# Test files aren't important for coverage
+ignore:
+  - "tests"
+
+# Make comments less noisy
+comment:
+  layout: "files"
+  require_changes: true
\ No newline at end of file
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index f1842f02..3c36e351 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -10,29 +10,36 @@ on:
 jobs:
   coverage:
     runs-on: ubuntu-latest
-    container:
-      image: xd009642/tarpaulin:develop-nightly
-      options: --security-opt seccomp=unconfined
-    steps:
-      - name: Checkout sources
-        uses: actions/checkout@v4
 
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: llvm-tools-preview
       - name: Install ubuntu dependencies
         run: |
-          apt-get update && apt-get install --no-install-recommends -y \
+          sudo apt-get update && sudo apt-get install --no-install-recommends -y \
             build-essential \
             llvm-dev \
             libcfitsio-dev \
             pkg-config \
             libssl-dev \
             python3
-
-      - name: Run cargo-tarpaulin
-        run: |
-          cargo +nightly tarpaulin --manifest-path fitsio/Cargo.toml --verbose --timeout 120 --out lcov
-
-      - name: Coveralls
-        uses: coverallsapp/github-action@master
+      - name: cargo install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      - name: cargo llvm-cov
+        run: cargo llvm-cov -p fitsio --locked --lcov --output-path lcov.info
+      - name: Record Rust version
+        run: echo "RUST=$(rustc --version)" >> "$GITHUB_ENV"
+      - name: Upload to codecov.io
+        uses: codecov/codecov-action@v4
         with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          path-to-lcov: lcov.info
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}
+          env_vars: OS,RUST