diff --git a/config/ext.json b/config/ext.json
index e74f64af1..6d5765e57 100644
--- a/config/ext.json
+++ b/config/ext.json
@@ -623,6 +623,14 @@
             "dom"
         ]
     },
+    "yac": {
+        "type": "external",
+        "source": "yac",
+        "arg-type-unix": "custom",
+        "ext-depends-unix": [
+            "igbinary"
+        ]
+    },
     "yaml": {
         "type": "external",
         "source": "yaml",
diff --git a/config/source.json b/config/source.json
index 6ed35f5de..870993476 100644
--- a/config/source.json
+++ b/config/source.json
@@ -673,6 +673,16 @@
             "path": "COPYING"
         }
     },
+    "yac": {
+        "type": "url",
+        "url": "https://pecl.php.net/get/yac",
+        "path": "php-src/ext/yac",
+        "filename": "yac.tgz",
+        "license": {
+            "type": "file",
+            "path": "LICENSE"
+        }
+    },
     "yaml": {
         "type": "git",
         "path": "php-src/ext/yaml",
diff --git a/src/SPC/builder/extension/yac.php b/src/SPC/builder/extension/yac.php
new file mode 100644
index 000000000..a4152e428
--- /dev/null
+++ b/src/SPC/builder/extension/yac.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\extension;
+
+use SPC\builder\Extension;
+use SPC\store\FileSystem;
+use SPC\util\CustomExt;
+
+#[CustomExt('yac')]
+class yac extends Extension
+{
+    public function patchBeforeBuildconf(): bool
+    {
+        FileSystem::replaceFileStr(SOURCE_PATH . '/php-src/ext/yac/storage/allocator/yac_allocator.h', 'defined(HAVE_SHM_MMAP_ANON)', 'defined(YAC_ALLOCATOR_H)');
+        FileSystem::replaceFileStr(SOURCE_PATH . '/php-src/ext/yac/serializer/igbinary.c', '#ifdef YAC_ENABLE_IGBINARY', '#if 1');
+        FileSystem::replaceFileStr(SOURCE_PATH . '/php-src/ext/yac/serializer/json.c', '#if YAC_ENABLE_JSON', '#if 1');
+        return true;
+    }
+
+    public function getUnixConfigureArg(): string
+    {
+        return '--enable-yac --enable-igbinary --enable-json';
+    }
+}
diff --git a/src/globals/test-extensions.php b/src/globals/test-extensions.php
index 7a855c065..07497e673 100644
--- a/src/globals/test-extensions.php
+++ b/src/globals/test-extensions.php
@@ -13,8 +13,8 @@
 
 // If you want to test your added extensions and libs, add below (comma separated, example `bcmath,openssl`).
 $extensions = match (PHP_OS_FAMILY) {
-    'Linux', 'Darwin' => 'pgsql,intl,xml,openssl',
-    'Windows' => 'mbstring,pdo_sqlite,mbregex,ffi,ds,simdjson',
+    'Linux', 'Darwin' => 'yac',
+    'Windows' => 'mbstring,pdo_sqlite,mbregex,yac',
 };
 
 // If you want to test lib-suggests feature with extension, add them below (comma separated, example `libwebp,libavif`).