diff --git a/config/pkg/ext/builtin-extensions.yml b/config/pkg/ext/builtin-extensions.yml
index 6b37a7d8..0709e27f 100644
--- a/config/pkg/ext/builtin-extensions.yml
+++ b/config/pkg/ext/builtin-extensions.yml
@@ -82,10 +82,13 @@ ext-gettext:
     arg-type: with-path
 ext-gmp:
   type: php-extension
-  depends:
+  depends@unix:
     - gmp
+  depends@windows:
+    - mpir
   php-extension:
     arg-type: with-path
+    arg-type@windows: with
 ext-iconv:
   type: php-extension
   depends@unix:
diff --git a/config/pkg/lib/mpir.yml b/config/pkg/lib/mpir.yml
new file mode 100644
index 00000000..6fc8012f
--- /dev/null
+++ b/config/pkg/lib/mpir.yml
@@ -0,0 +1,9 @@
+mpir:
+  type: library
+  artifact:
+    source:
+      type: git
+      url: 'https://github.com/winlibs/mpir.git'
+      rev: master
+  static-libs@windows:
+    - mpir_a.lib
diff --git a/src/Package/Library/mpir.php b/src/Package/Library/mpir.php
new file mode 100644
index 00000000..951d218a
--- /dev/null
+++ b/src/Package/Library/mpir.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Package\Library;
+
+use StaticPHP\Attribute\Package\BuildFor;
+use StaticPHP\Attribute\Package\Library;
+use StaticPHP\Attribute\Package\Validate;
+use StaticPHP\DI\ApplicationContext;
+use StaticPHP\Exception\EnvironmentException;
+use StaticPHP\Package\LibraryPackage;
+use StaticPHP\Util\FileSystem;
+use StaticPHP\Util\System\WindowsUtil;
+
+#[Library('mpir')]
+class mpir
+{
+    #[Validate]
+    public function validate(): void
+    {
+        $ver = WindowsUtil::findVisualStudio();
+        $vs_ver_dir = match ($ver['major_version']) {
+            '17' => '\build.vc17',
+            '16' => '\build.vc16',
+            default => throw new EnvironmentException("Current VS version {$ver['major_version']} is not supported yet!"),
+        };
+        ApplicationContext::set('mpir_vs_ver_dir', $vs_ver_dir);
+    }
+
+    #[BuildFor('Windows')]
+    public function build(LibraryPackage $lib): void
+    {
+        $vs_ver_dir = ApplicationContext::get('mpir_vs_ver_dir');
+        cmd()->cd("{$lib->getSourceDir()}{$vs_ver_dir}\\lib_mpir_gc")
+            ->exec('msbuild lib_mpir_gc.vcxproj /t:Rebuild /p:Configuration=Release /p:Platform=x64');
+        FileSystem::createDir($lib->getLibDir());
+        FileSystem::createDir($lib->getIncludeDir());
+        FileSystem::copy("{$lib->getSourceDir()}{$vs_ver_dir}\\lib_mpir_gc\\x64\\Release\\mpir_a.lib", "{$lib->getLibDir()}\\mpir_a.lib");
+        // mpir.h and gmp.h are generated by the prebuild step into the source root
+        FileSystem::copy("{$lib->getSourceDir()}\\mpir.h", "{$lib->getIncludeDir()}\\mpir.h");
+        FileSystem::copy("{$lib->getSourceDir()}\\gmp.h", "{$lib->getIncludeDir()}\\gmp.h");
+    }
+}