diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 83ae9cc9..74394e26 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -168,4 +168,4 @@ jobs:
             bin/spc download --for-extensions="$(php src/globals/test-extensions.php extensions)" --for-libs="$(php src/globals/test-extensions.php libs)" --with-php=${{ matrix.php }} --ignore-cache-sources=php-src --debug --retry=3
 
       - name: "Run Build Tests (build)"
-        run: bin/spc build "$(php src/globals/test-extensions.php extensions)" --with-libs="$(php src/globals/test-extensions.php libs)" --build-cli --build-micro --build-fpm --debug
+        run: bin/spc build "$(php src/globals/test-extensions.php extensions)" $(php src/globals/test-extensions.php zts) --with-libs="$(php src/globals/test-extensions.php libs)" --build-cli --build-micro --build-fpm --debug
diff --git a/config/ext.json b/config/ext.json
index 6dd0b719..8886dd54 100644
--- a/config/ext.json
+++ b/config/ext.json
@@ -187,6 +187,11 @@
             "icu"
         ]
     },
+    "parallel": {
+        "type": "external",
+        "source": "parallel",
+        "arg-type-windows": "with"
+    },
     "ldap": {
         "type": "builtin",
         "arg-type": "with-prefix",
@@ -283,7 +288,10 @@
     "parallel": {
         "type": "external",
         "source": "parallel",
-        "arg-type-windows": "with"
+        "arg-type-windows": "with",
+        "lib-depends-windows": [
+            "pthreads4w"
+        ]
     },
     "password-argon2": {
         "type": "builtin",
diff --git a/config/lib.json b/config/lib.json
index b7a92d04..d2364a3a 100644
--- a/config/lib.json
+++ b/config/lib.json
@@ -528,6 +528,12 @@
             "zstd"
         ]
     },
+    "pthreads4w": {
+        "source": "pthreads4w",
+        "static-libs-windows": [
+            "libpthreadVC3.lib"
+        ]
+    },
     "qdbm": {
         "source": "qdbm",
         "static-libs-unix": [
diff --git a/config/source.json b/config/source.json
index 4e4f62db..b666ca6c 100644
--- a/config/source.json
+++ b/config/source.json
@@ -561,6 +561,15 @@
             "path": "LICENSE"
         }
     },
+    "pthreads4w": {
+        "type": "git",
+        "rev": "master",
+        "url": "https://git.code.sf.net/p/pthreads4w/code",
+        "license": {
+            "type": "file",
+            "path": "LICENSE"
+        }
+    },
     "qdbm": {
         "type": "git",
         "url": "https://github.com/static-php/qdbm.git",
diff --git a/src/SPC/builder/windows/library/pthreads4w.php b/src/SPC/builder/windows/library/pthreads4w.php
new file mode 100644
index 00000000..66707cbb
--- /dev/null
+++ b/src/SPC/builder/windows/library/pthreads4w.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\windows\library;
+
+class pthreads4w extends WindowsLibraryBase
+{
+    public const NAME = 'pthreads4w';
+
+    protected function build(): void
+    {
+        cmd()->cd($this->source_dir)
+            ->execWithWrapper(
+                $this->builder->makeSimpleWrapper(
+                    'nmake /E /nologo /f Makefile ' .
+                    'DESTROOT=' . BUILD_ROOT_PATH . ' ' .
+                    'XCFLAGS="/MT" ' . // no dll
+                    'EHFLAGS="/I. /DHAVE_CONFIG_H /Os /Ob2 /D__PTW32_STATIC_LIB /D__PTW32_BUILD_INLINED"'
+                ),
+                'pthreadVC3.inlined_static_stamp'
+            );
+        copy($this->source_dir . '\libpthreadVC3.lib', BUILD_LIB_PATH . '\libpthreadVC3.lib');
+        copy($this->source_dir . '\_ptw32.h', BUILD_INCLUDE_PATH . '\_ptw32.h');
+        copy($this->source_dir . '\pthread.h', BUILD_INCLUDE_PATH . '\pthread.h');
+        copy($this->source_dir . '\sched.h', BUILD_INCLUDE_PATH . '\sched.h');
+        copy($this->source_dir . '\semaphore.h', BUILD_INCLUDE_PATH . '\semaphore.h');
+    }
+}
diff --git a/src/globals/test-extensions.php b/src/globals/test-extensions.php
index 96001af2..0dfc8312 100644
--- a/src/globals/test-extensions.php
+++ b/src/globals/test-extensions.php
@@ -11,10 +11,12 @@ declare(strict_types=1);
 
 // --------------------------------- edit area ---------------------------------
 
+$zts = true;
+
 // If you want to test your added extensions and libs, add below (comma separated, example `bcmath,openssl`).
 $extensions = match (PHP_OS_FAMILY) {
-    'Linux', 'Darwin' => 'readline,pgsql,xml,dom,mbstring,mbregex,pdo_pgsql',
-    'Windows' => 'mbstring,pdo_sqlite,mbregex',
+    'Linux', 'Darwin' => 'parallel',
+    'Windows' => 'mbstring,pdo_sqlite,mbregex,parallel',
 };
 
 // If you want to test lib-suggests feature with extension, add them below (comma separated, example `libwebp,libavif`).
@@ -27,7 +29,7 @@ $with_libs = match (PHP_OS_FAMILY) {
 // You can use `common`, `bulk`, `minimal` or `none`.
 // note: combination is only available for *nix platform. Windows must use `none` combination
 $base_combination = match (PHP_OS_FAMILY) {
-    'Linux', 'Darwin' => 'none',
+    'Linux', 'Darwin' => 'minimal',
     'Windows' => 'none',
 };
 
@@ -71,5 +73,6 @@ echo match ($argv[1]) {
     'libs' => $final_libs,
     'libs_cmd' => ($final_libs === '' ? '' : (' --with-libs=' . $final_libs)),
     'cmd' => $final_extensions_cmd . ($final_libs === '' ? '' : (' --with-libs=' . $final_libs)),
+    'zts' => $zts ? '--enable-zts' : '',
     default => '',
 };