diff --git a/ouroboros/claudexor_runtime_pin.json b/ouroboros/claudexor_runtime_pin.json
index 4bcf727b3..12a20a54d 100644
--- a/ouroboros/claudexor_runtime_pin.json
+++ b/ouroboros/claudexor_runtime_pin.json
@@ -1,12 +1,12 @@
 {
  "schema_version": 1,
  "release": {
-  "version": "3.15.0",
-  "build_sha": "68faf93622cff0876e1d63de9f45dadb0384f2c9",
+  "version": "3.15.1",
+  "build_sha": "fd83507ad287937e1156be9801ba86ef739680e7",
   "protocol_major": 3,
-  "archive_url": "https://github.com/razzant/claudexor/releases/download/v3.15.0/claudexor-runtime-3.15.0.tar.gz",
-  "sha256": "f468e22ada83b0e6d6c2a2b3b7e3b0e1ef3736c3345069172e1f27918f3a098a",
-  "size_bytes": 7874252,
+  "archive_url": "https://github.com/razzant/claudexor/releases/download/v3.15.1/claudexor-runtime-3.15.1.tar.gz",
+  "sha256": "33cbf3ecf3c67792c1a05ae1d974ff5e5e158538d1e4c578e33cd6cfa094e79e",
+  "size_bytes": 7874102,
   "node_version": "24.16.0",
   "node_artifacts": {
    "darwin-arm64": {
diff --git a/scripts/claudexor_toolchain_smoke.py b/scripts/claudexor_toolchain_smoke.py
index e79d34af5..13fa0504b 100644
--- a/scripts/claudexor_toolchain_smoke.py
+++ b/scripts/claudexor_toolchain_smoke.py
@@ -346,9 +346,11 @@ def doctor_witness(harness: str, command: List[str], env: Dict[str, str], binary
             rows = gateway.harnesses()
         finally:
             gateway.close()
-        # Use the full doctor verb proven by Claudexor's Windows release smoke.
-        # Our targeted --harness call aborted in libuv on two Windows CI runs;
-        # the precise cause is unknown. The exact harness row is checked below.
+        # Use the full doctor verb. On Windows, Claudexor <= 3.15.0 printed valid
+        # doctor JSON and then aborted in libuv (Node 24 close race on forced
+        # process.exit after fetch; fixed upstream in Claudexor 3.15.1, PR #356), so
+        # the exit status here is part of the witness. The exact harness row is
+        # checked below.
         report = _cli_json([*command, "doctor", "--json"], "harness_doctor_failed", env)
     except ClaudexorUnavailable as exc:
         _stop_owned_daemon(daemon)
diff --git a/tests/test_claudexor_runtime_delivery.py b/tests/test_claudexor_runtime_delivery.py
index 60bf7229a..4940f8463 100644
--- a/tests/test_claudexor_runtime_delivery.py
+++ b/tests/test_claudexor_runtime_delivery.py
@@ -155,7 +155,7 @@ def test_tracked_pin_names_a_cli_capable_release():
     of this proposal converged on while the pin was still pre-CLI 3.6.0)."""
     pin = runtime.load_runtime_pin()
     assert pin is not None
-    assert pin.version == "3.15.0"
+    assert pin.version == "3.15.1"
     assert pin.cli_entrypoint == "claudexor.bundle.cjs"