diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index ec28f3cb..589c5277 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -45,10 +45,12 @@ jobs:
       - uses: supercharge/redis-github-action@1.1.0
         with:
           redis-version: 5
+      # Nightly is required for code coverage with doctests
+      # https://github.com/taiki-e/cargo-llvm-cov/issues/2
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: stable
+          toolchain: nightly
           override: true
       - uses: abelfodil/protoc-action@v1
         with:
@@ -56,7 +58,7 @@ jobs:
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
       - name: Test and Generate code coverage
-        run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
+        run: cargo +nightly llvm-cov --all-features --workspace --lcov --doctests --output-path lcov.info
       - name: Codecov
         uses: codecov/codecov-action@v3
         with: