diff --git a/.github/workflows/nanvix-ci.yml b/.github/workflows/nanvix-ci.yml
index 7051ae987..f9dfa4083 100644
--- a/.github/workflows/nanvix-ci.yml
+++ b/.github/workflows/nanvix-ci.yml
@@ -26,7 +26,7 @@ concurrency:
 jobs:
   ci:
     if: github.event_name != 'schedule' && github.event_name != 'workflow_dispatch'
-    uses: nanvix/workflows/.github/workflows/nanvix-ci.yml@v2.2.0
+    uses: nanvix/workflows/.github/workflows/nanvix-ci.yml@v2.3.0
     with:
       platforms: '["microvm"]'
       process-modes: '["multi-process","single-process","standalone"]'
@@ -43,7 +43,7 @@ jobs:
 
   ci-scheduled:
     if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
-    uses: nanvix/workflows/.github/workflows/nanvix-ci.yml@v2.2.0
+    uses: nanvix/workflows/.github/workflows/nanvix-ci.yml@v2.3.0
     with:
       platforms: '["microvm"]'
       process-modes: '["multi-process","single-process","standalone"]'
diff --git a/.nanvix/z.py b/.nanvix/z.py
index b975fb487..60bc9a5f3 100644
--- a/.nanvix/z.py
+++ b/.nanvix/z.py
@@ -284,7 +284,8 @@ def _run_tests_windows(self) -> None:
 
         test_allowlist = {"test_libxml2.elf"}
         test_binaries: list[Path] = []
-        for candidate in [repo_root(), repo_root() / "build"]:
+        # test_out() is the windows-test artifact overlay.
+        for candidate in [test_out(), repo_root(), repo_root() / "build"]:
             if candidate.is_dir():
                 for elf in sorted(candidate.glob("*.elf")):
                     if elf.name in test_allowlist and elf.name not in {
@@ -313,12 +314,10 @@ def _run_tests_windows(self) -> None:
             initrd: Path | None = None
             try:
                 if binary.resolve() != repo_elf.resolve():
-                    if repo_elf.exists():
-                        raise FileExistsError(
-                            f"refusing to clobber existing {repo_elf}"
-                        )
+                    # Don't clobber a dev's prior repo-root build.
+                    preexisted = repo_elf.exists()
                     shutil.copy2(binary, repo_elf)
-                    copied_elf = True
+                    copied_elf = not preexisted
                 initrd = make_initrd(self, binary.name, test=True)
                 with tempfile.TemporaryDirectory(prefix=f"nanvix_{name}_") as tmpdir:
                     tmpdir_path = Path(tmpdir)