diff --git a/devel/R-cran-data.table/Makefile b/devel/R-cran-data.table/Makefile
index bd7b271fc289..8cbed88c6945 100644
--- a/devel/R-cran-data.table/Makefile
+++ b/devel/R-cran-data.table/Makefile
@@ -1,24 +1,28 @@
 PORTNAME=	data.table
-DISTVERSION=	1.18.4
+DISTVERSION=	1.18.6.1
 CATEGORIES=	devel
 DISTNAME=	${PORTNAME}_${DISTVERSION}
 
 MAINTAINER=	eduardo@FreeBSD.org
 COMMENT=	Extension of Data.frame
 WWW=		https://cran.r-project.org/package=data.table
 
 LICENSE=	MPL20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 TEST_DEPENDS=	R-cran-bit64>0:devel/R-cran-bit64 \
 		R-cran-knitr>0:print/R-cran-knitr \
 		R-cran-R.utils>0:devel/R-cran-R.utils
 
 USES=		cran:auto-plist,compiles pkgconfig
 
+# Tests need a valid Sys.timezone(); poudriere jails have no /etc/localtime.
+# MAKE_ENV as cran.mk's do-test does not honour TEST_ENV
+MAKE_ENV+=	TZ=UTC
+
 NO_ARCH_IGNORE=	data_table.so
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/R/library/data.table/libs/data_table.so
 
 .include <bsd.port.mk>
diff --git a/devel/R-cran-data.table/distinfo b/devel/R-cran-data.table/distinfo
index 1f8b89e8f099..e88a37979dc5 100644
--- a/devel/R-cran-data.table/distinfo
+++ b/devel/R-cran-data.table/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1778329508
-SHA256 (data.table_1.18.4.tar.gz) = d65256f0050a6443770d5982b5098a2a8c894f9675ed17053416c7815cbddeb9
-SIZE (data.table_1.18.4.tar.gz) = 6022884
+TIMESTAMP = 1787652544
+SHA256 (data.table_1.18.6.1.tar.gz) = f2846f45fbbdfe886f05fa7489314a56ae0f3352ae5bc1070b0cdd4f44ffa1f5
+SIZE (data.table_1.18.6.1.tar.gz) = 6028881