diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 625553fa..5fb68ec2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -106,6 +106,16 @@ jobs:
       run: just test
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - name: Get code coverage
+      run: just test-coverage
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - name: Upload coverage data to codecov
+      uses: codecov/codecov-action@v4
+      with:
+        files: lcov.info
+        fail_ci_if_error: true
+        token: ${{ secrets.CODECOV_TOKEN }}
     - run: git add . && git diff
     - run: git diff --cached
     - name: Ensure no files have changed
diff --git a/justfile b/justfile
index 34603430..3bf850eb 100644
--- a/justfile
+++ b/justfile
@@ -28,6 +28,7 @@ package-language-plugin VERSION:
 
 install-requirements:
     rustup component add rustfmt
+    rustup component add llvm-tools-preview
     cargo binstall --no-confirm cargo-nextest@{{NEXTEST_VERSION}}
     cargo binstall --no-confirm cargo-component@{{CARGO_COMPONENT_VERSION}}
     cargo binstall --no-confirm sd@{{SD_VERSION}}
@@ -120,6 +121,10 @@ publish-providers:
 test:
     cargo nextest run --workspace --timings
 
+test-coverage:
+    cargo llvm-cov --no-report -p pulumi_wasm_core
+    cargo llvm-cov report --lcov --output-path lcov.info
+
 docs:
     docker run --rm -it -p 8000:8000 -v ${PWD}:/docs squidfunk/mkdocs-material