diff --git a/textproc/rubygem-psych/Makefile b/textproc/rubygem-psych/Makefile
index b2c258b33221e..51ad47e8541e6 100644
--- a/textproc/rubygem-psych/Makefile
+++ b/textproc/rubygem-psych/Makefile
@@ -1,7 +1,7 @@
 # Created by: Po-Chuan Hsieh <sunpoet@FreeBSD.org>
 
 PORTNAME=	psych
-PORTVERSION=	4.0.2
+PORTVERSION=	4.0.3
 CATEGORIES=	textproc rubygems
 MASTER_SITES=	RG
 
@@ -12,6 +12,7 @@ LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 LIB_DEPENDS=	libyaml.so:textproc/libyaml
+RUN_DEPENDS=	rubygem-stringio>=0:devel/rubygem-stringio
 
 USES=		gem
 USE_RUBY=	yes
diff --git a/textproc/rubygem-psych/distinfo b/textproc/rubygem-psych/distinfo
index 45e27c8f7c895..1d4407d120497 100644
--- a/textproc/rubygem-psych/distinfo
+++ b/textproc/rubygem-psych/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1635181725
-SHA256 (rubygem/psych-4.0.2.gem) = 99e5a57d01eefbb7f9e9266ed9a9960cb9c2cfed77028fec0a3cfc08f11d64af
-SIZE (rubygem/psych-4.0.2.gem) = 93184
+TIMESTAMP = 1641046770
+SHA256 (rubygem/psych-4.0.3.gem) = c75238c1a201c37249a5403c23442ce0647d5a5632306856c5d85a5db227fa99
+SIZE (rubygem/psych-4.0.3.gem) = 93184