diff --git a/math/imath/Makefile b/math/imath/Makefile
index 6b219c2beba..a948516d440 100644
--- a/math/imath/Makefile
+++ b/math/imath/Makefile
@@ -1,8 +1,8 @@
-# $OpenBSD: Makefile,v 1.1.1.1 2021/08/31 07:28:13 ajacoutot Exp $
+# $OpenBSD: Makefile,v 1.2 2021/09/03 07:09:23 ajacoutot Exp $
 
 COMMENT=		C++ and python library of 2D and 3D vector & matrix
 
-V=			3.1.2
+V=			3.1.3
 GH_ACCOUNT=		AcademySoftwareFoundation
 GH_PROJECT=		Imath
 GH_TAGNAME=		v${V}
diff --git a/math/imath/distinfo b/math/imath/distinfo
index 003c1466a8d..969439288ef 100644
--- a/math/imath/distinfo
+++ b/math/imath/distinfo
@@ -1,2 +1,2 @@
-SHA256 (Imath-3.1.2.tar.gz) = 8hNQ79zHY+I7/9Te2bv4IuYwwV7OawaX4vy0JzfAjC0=
-SIZE (Imath-3.1.2.tar.gz) = 566098
+SHA256 (Imath-3.1.3.tar.gz) = C/fsURYsTRekxbhQ+z9vehlc/5+nH02nc19017USQyA=
+SIZE (Imath-3.1.3.tar.gz) = 570840