diff --git a/math/z3/Makefile b/math/z3/Makefile
index ff476bdc1dff..529069510a96 100644
--- a/math/z3/Makefile
+++ b/math/z3/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=	z3
 DISTVERSIONPREFIX=	z3-
-DISTVERSION=	4.8.13
+DISTVERSION=	4.8.16
 CATEGORIES=	math
 
 MAINTAINER=	arrowd@FreeBSD.org
@@ -22,6 +22,7 @@ OPTIONS_DEFINE=		DEBUG STATIC GMP
 OPTIONS_SUB=		yes
 
 DEBUG_CONFIGURE_ON=	--debug
+DEBUG_VARS=		with_debug=yes
 
 STATIC_DESC=		Build static z3 library
 STATIC_CONFIGURE_ON=	--staticlib
diff --git a/math/z3/distinfo b/math/z3/distinfo
index aaa11d1eb67b..f5d61a2521c8 100644
--- a/math/z3/distinfo
+++ b/math/z3/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1639500301
-SHA256 (Z3Prover-z3-z3-4.8.13_GH0.tar.gz) = 59a0b35711fa7ae48dd535116d2067a6a16955fcbf2623c516a3f630cd2832d8
-SIZE (Z3Prover-z3-z3-4.8.13_GH0.tar.gz) = 5103999
+TIMESTAMP = 1651515677
+SHA256 (Z3Prover-z3-z3-4.8.16_GH0.tar.gz) = 75f95e09f3f35fef746e571d5ec88a4efba27f1bc8f1a0ef1117167486ec3dc6
+SIZE (Z3Prover-z3-z3-4.8.16_GH0.tar.gz) = 5223980