diff --git a/security/py-mnemonic/Makefile b/security/py-mnemonic/Makefile
index 7d4e18b24ff6..c139cd4097bb 100644
--- a/security/py-mnemonic/Makefile
+++ b/security/py-mnemonic/Makefile
@@ -1,20 +1,21 @@
 PORTNAME=	mnemonic
-PORTVERSION=	0.20
+PORTVERSION=	0.21
 CATEGORIES=	security python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	ehaupt@FreeBSD.org
 COMMENT=	Implementation of Bitcoin BIP-0039
 WWW=		https://github.com/trezor/python-mnemonic
 
 LICENSE=	MIT
 
+BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}poetry-core>=0:devel/py-poetry-core@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pbkdf2>=1.3:security/py-pbkdf2@${PY_FLAVOR}
 
 USES=		python
-USE_PYTHON=	autoplist distutils
+USE_PYTHON=	autoplist pep517
 
 NO_ARCH=	yes
 
 .include <bsd.port.mk>
diff --git a/security/py-mnemonic/distinfo b/security/py-mnemonic/distinfo
index 6035ea77b0fc..30e49eb8ef41 100644
--- a/security/py-mnemonic/distinfo
+++ b/security/py-mnemonic/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1627453758
-SHA256 (mnemonic-0.20.tar.gz) = 7c6fb5639d779388027a77944680aee4870f0fcd09b1e42a5525ee2ce4c625f6
-SIZE (mnemonic-0.20.tar.gz) = 67596
+TIMESTAMP = 1704538959
+SHA256 (mnemonic-0.21.tar.gz) = 1fe496356820984f45559b1540c80ff10de448368929b9c60a2b55744cc88acf
+SIZE (mnemonic-0.21.tar.gz) = 152462