diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0520427a..cdd79a93 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -569,7 +569,8 @@ jobs:
       #
       # `same-source` also runs on bare metal, so it cannot start a thread;
       # `examples/cxx` can, and on Windows a joined std::thread was an access
-      # violation until openkal-musl 0.13.2 widened C++ `pthread_t`.
+      # violation until openkal-musl 0.13.2 widened C++ `pthread_t`; on macOS a
+      # detached one ending was, until openkal-musl 0.13.3.
       - name: A hosted C++ program above it runs on this host
         run: |
           set -euo pipefail
@@ -579,6 +580,7 @@ jobs:
           # thread, so a difference elsewhere is reported without failing it.
           mcpp run --target '${{ matrix.native }}' 2>&1 | tee out.log || true
           grep -q 'ok: a thread is started and joined' out.log
+          grep -q 'ok: a detached thread runs and ends' out.log
 
       - name: The artefact for this host runs on it
         run: |
diff --git a/examples/cxx/src/main.cpp b/examples/cxx/src/main.cpp
index 8c3b3645..07aead81 100644
--- a/examples/cxx/src/main.cpp
+++ b/examples/cxx/src/main.cpp
@@ -19,6 +19,8 @@
 #include <random>
 #include <system_error>
 #include <thread>
+#include <atomic>
+#include <chrono>
 
 // ⭐ THREE NAMES A PROGRAM ABOVE THIS STACK MAY USE, ASSERTED BY COMPILING.
 //
@@ -82,6 +84,20 @@ int main() {
         check(joinable && written == 42 && !worker.joinable(), "a thread is started and joined");
     }
 
+    // ⚠️ AND A DETACHED THREAD ENDS WITHOUT ENDING THE PROGRAM. musl released a
+    // detached thread's mapping from a 256-byte stack every exiting thread
+    // shares, and openkal-musl's path for the calls that end the thread overran
+    // it into the context table; on macOS the program stopped as the thread
+    // ended. Fixed in openkal-musl 0.13.3.
+    {
+        static std::atomic<bool> ran{false};
+        std::thread([] { ran = true; }).detach();
+        for (int i = 0; i < 400 && !ran; ++i) std::this_thread::sleep_for(std::chrono::milliseconds(5));
+        // Running is reported before ending; the pause lets the thread end.
+        std::this_thread::sleep_for(std::chrono::milliseconds(100));
+        check(ran, "a detached thread runs and ends");
+    }
+
     // --- std::filesystem, which is the C++ face of openkal.fs ---------------
 
     namespace fs = std::filesystem;
diff --git a/mcpp.toml b/mcpp.toml
index d2ea818d..46484521 100644
--- a/mcpp.toml
+++ b/mcpp.toml
@@ -1,7 +1,7 @@
 [package]
 namespace   = "mcpplibs"
 name        = "openkal-llvm-runtime"
-version     = "0.9.3"
+version     = "0.9.4"
 description = "LLVM's C++ runtime libraries — libc++, libc++abi and libunwind — configured for openkal-musl rather than for a host C library."
 license     = "Apache-2.0"
 authors     = ["mcpplibs"]
@@ -208,7 +208,7 @@ sources = [
 cflags = ["-DDISABLE_AARCH64_FMV=1"]
 
 [dependencies]
-openkal-musl = "0.13.2"
+openkal-musl = "0.13.3"
 
 [build]
 cxx_standard = "c++23"