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+# Update LLGo Version
+
+## Description
+
+Update the `github.com/goplus/llgo` dependency to a new version across all configuration and CI files in the repository.
+
+## When to Use
+
+When a new version of LLGo is released and the project needs to be updated to use it.
+
+## Files to Update
+
+The following files must all be updated consistently to the same new version:
+
+1. **`go.mod`** — Update the `github.com/goplus/llgo` require directive to the new version.
+2. **`go.sum`** — Run `go mod tidy` to update checksums after changing `go.mod`.
+3. **`.github/workflows/go.yml`** — Update the `llgo: [vX.Y.Z]` entry in the strategy matrix.
+4. **`.github/workflows/end2end.yml`** — Update the `llgo: [vX.Y.Z]` entry in the strategy matrix.
+5. **`.github/workflows/gentest.yml`** — Update the `llgo: [vX.Y.Z]` entry in the strategy matrix.
+6. **`.github/actions/setup-llcppg/action.yml`** — Update the default value for the `llgo` input and its description.
+
+## Steps
+
+1. Determine the current llgo version by reading `go.mod`.
+2. Update `go.mod` to reference the new version:
+   - Change `github.com/goplus/llgo vOLD` to `github.com/goplus/llgo vNEW`.
+3. Run `go mod tidy` to update `go.sum`.
+4. Update all three CI workflow files (`.github/workflows/go.yml`, `.github/workflows/end2end.yml`, `.github/workflows/gentest.yml`):
+   - Change `llgo: [vOLD]` to `llgo: [vNEW]` in the strategy matrix.
+5. Update `.github/actions/setup-llcppg/action.yml`:
+   - Change the `default:` value for the `llgo` input from `"vOLD"` to `"vNEW"`.
+   - Update the `description:` to reference the new version (e.g., `"LLGo version to download (e.g. vNEW)"`).
+6. Run validation:
+   ```bash
+   go build -v ./...
+   go vet ./...
+   go test -v ./config ./internal/name ./internal/arg ./internal/unmarshal
+   ```
+7. Commit all changes together with a message like:
+   ```
+   build(deps): bump github.com/goplus/llgo from vOLD to vNEW
+   ```