diff --git a/python-attrs/PKGBUILD b/python-attrs/PKGBUILD
index 231c9b81..372db925 100644
--- a/python-attrs/PKGBUILD
+++ b/python-attrs/PKGBUILD
@@ -3,7 +3,7 @@
 _realname=attrs
 pkgbase=python-attrs
 pkgname=("python-${_realname}")
-pkgver=25.3.0
+pkgver=25.4.0
 pkgrel=1
 pkgdesc="Attributes without boilerplate."
 arch=('any')
@@ -11,6 +11,8 @@ license=('spdx:MIT')
 url='https://www.attrs.org/'
 msys2_repository_url='https://github.com/python-attrs/attrs'
 msys2_references=(
+  'archlinux: python-attrs'
+  'gentoo: dev-python/attrs'
   "purl: pkg:pypi/attrs"
 )
 depends=('python')
@@ -22,7 +24,7 @@ makedepends=(
   'python-installer'
 )
 source=("https://pypi.org/packages/source/${_realname::1}/${_realname}/${_realname}-${pkgver}.tar.gz")
-sha512sums=('acf34c38865157c49ba4070b35a162f0eb976ded0a8b8f74afe4c7e7238b8418af6108954cfc92c9721a090505e73ae193225a73a02352ab3bba0d9ace189059')
+sha512sums=('945ea1766adf7e8c8cc8b8f8c63c3dca652553522cede6a09d479f9919a41d43539819da2fe6fdc0e0b42822e353c7cb04b79fb9cecfd54bde5e301574a82341')
 
 build() {
   cd "${srcdir}/${_realname}-${pkgver}"