diff --git a/.config/nextest.toml b/.config/nextest.toml
new file mode 100644
index 0000000..f40c8e3
--- /dev/null
+++ b/.config/nextest.toml
@@ -0,0 +1,3 @@
+# JUnit output for Codecov Test Analytics (used by the `ci` profile in CI).
+[profile.ci.junit]
+path = "junit.xml"
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index cb19460..6a0b1b2 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -56,7 +56,14 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: actions-rust-lang/setup-rust-toolchain@v1
-      - run: cargo test
+      - uses: taiki-e/install-action@nextest
+      - run: cargo nextest run --profile ci
+      - name: Upload test results to Codecov
+        if: ${{ !cancelled() && matrix.os == 'ubuntu-latest' }}
+        uses: codecov/codecov-action@v5
+        with:
+          report_type: test_results
+          files: target/nextest/ci/junit.xml
 
   coverage:
     name: Coverage