diff --git a/.github/workflows/ci-macos.yml b/.github/workflows/ci-macos.yml
new file mode 100644
index 0000000..fceda8f
--- /dev/null
+++ b/.github/workflows/ci-macos.yml
@@ -0,0 +1,20 @@
+name: ci-macos
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: 构建依赖 blockmalloc（macOS 无预编译 ABI，从源码装）
+        run: |
+          git clone --depth 1 --branch v0.1.4 https://github.com/array2d/blockmalloc.git /tmp/blockmalloc
+          cmake -S /tmp/blockmalloc -B /tmp/blockmalloc/build \
+            -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local
+          cmake --build /tmp/blockmalloc/build -j
+          sudo cmake --install /tmp/blockmalloc/build
+      - name: 构建
+        run: |
+          cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local
+          cmake --build build -j
+      - name: 测试
+        run: cd build && ctest --output-on-failure
diff --git a/tutorial/07_bench_concurrent.c b/tutorial/07_bench_concurrent.c
index 92dc963..fa70fa2 100644
--- a/tutorial/07_bench_concurrent.c
+++ b/tutorial/07_bench_concurrent.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/08_bench_pure.c b/tutorial/08_bench_pure.c
index 06062f6..79f3072 100644
--- a/tutorial/08_bench_pure.c
+++ b/tutorial/08_bench_pure.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/09_bench_sharded.c b/tutorial/09_bench_sharded.c
index becf096..9aea88b 100644
--- a/tutorial/09_bench_sharded.c
+++ b/tutorial/09_bench_sharded.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/10_bench_diag.c b/tutorial/10_bench_diag.c
index 5605f96..90bb8a7 100644
--- a/tutorial/10_bench_diag.c
+++ b/tutorial/10_bench_diag.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/11_bench_shallow.c b/tutorial/11_bench_shallow.c
index 61e4a6a..3be2837 100644
--- a/tutorial/11_bench_shallow.c
+++ b/tutorial/11_bench_shallow.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/12_bench_lock.c b/tutorial/12_bench_lock.c
index ff5a1e0..e7d83d0 100644
--- a/tutorial/12_bench_lock.c
+++ b/tutorial/12_bench_lock.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/13_bench_diag2.c b/tutorial/13_bench_diag2.c
index d296581..43f908d 100644
--- a/tutorial/13_bench_diag2.c
+++ b/tutorial/13_bench_diag2.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/14_bench_alloc_only.c b/tutorial/14_bench_alloc_only.c
index e2c2962..41adcf4 100644
--- a/tutorial/14_bench_alloc_only.c
+++ b/tutorial/14_bench_alloc_only.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/15_bench_dedicated.c b/tutorial/15_bench_dedicated.c
index 0b45b63..ee10598 100644
--- a/tutorial/15_bench_dedicated.c
+++ b/tutorial/15_bench_dedicated.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tutorial/16_bench_malloc.c b/tutorial/16_bench_malloc.c
index 02103c2..428e60a 100644
--- a/tutorial/16_bench_malloc.c
+++ b/tutorial/16_bench_malloc.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200809L
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>