diff --git a/math/libtommath/Makefile b/math/libtommath/Makefile
index 1214037c6c5..d0383935a30 100644
--- a/math/libtommath/Makefile
+++ b/math/libtommath/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.9 2019/07/12 20:47:42 sthen Exp $
+# $OpenBSD: Makefile,v 1.10 2021/03/11 06:29:21 gkoehler Exp $
 
 COMMENT =		number theoretic multiple-precision integer library
 CATEGORIES =		math
@@ -6,8 +6,7 @@ HOMEPAGE =		http://libtom.net/
 
 GH_ACCOUNT =		libtom
 GH_PROJECT =		libtommath
-GH_TAGNAME =		v1.0.1
-REVISION =		0
+GH_TAGNAME =		v1.2.0
 
 # WTFPL
 PERMIT_PACKAGE =	Yes
diff --git a/math/libtommath/distinfo b/math/libtommath/distinfo
index 19d7317746d..e8b3aaabee1 100644
--- a/math/libtommath/distinfo
+++ b/math/libtommath/distinfo
@@ -1,2 +1,2 @@
-SHA256 (libtommath-1.0.1.tar.gz) = 2ytua1EqrFzJvn5P/dFdlxw/A9P6NfkWB7/hp/p1p6c=
-SIZE (libtommath-1.0.1.tar.gz) = 653112
+SHA256 (libtommath-1.2.0.tar.gz) = 88IKtd9gDY2J4FTQlsEWQXGXgn0Scy5nhSVmeqck4w8=
+SIZE (libtommath-1.2.0.tar.gz) = 242318
diff --git a/math/libtommath/patches/patch-bn_mp_set_double_c b/math/libtommath/patches/patch-bn_mp_set_double_c
new file mode 100644
index 00000000000..6b53122b6fc
--- /dev/null
+++ b/math/libtommath/patches/patch-bn_mp_set_double_c
@@ -0,0 +1,16 @@
+$OpenBSD: patch-bn_mp_set_double_c,v 1.1 2021/03/11 06:29:21 gkoehler Exp $
+
+We have IEEE754 floating-point.
+
+Index: bn_mp_set_double.c
+--- bn_mp_set_double.c.orig
++++ bn_mp_set_double.c
+@@ -3,7 +3,7 @@
+ /* LibTomMath, multiple-precision integer library -- Tom St Denis */
+ /* SPDX-License-Identifier: Unlicense */
+ 
+-#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559)
++#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559) || 1
+ mp_err mp_set_double(mp_int *a, double b)
+ {
+    uint64_t frac;
diff --git a/math/libtommath/patches/patch-makefile_include_mk b/math/libtommath/patches/patch-makefile_include_mk
deleted file mode 100644
index 8345f8bb8eb..00000000000
--- a/math/libtommath/patches/patch-makefile_include_mk
+++ /dev/null
@@ -1,18 +0,0 @@
-$OpenBSD: patch-makefile_include_mk,v 1.1 2017/11/25 21:42:51 afresh1 Exp $
-
-Index: makefile_include.mk
---- makefile_include.mk.orig
-+++ makefile_include.mk
-@@ -87,12 +87,6 @@ LIBPATH  ?= $(PREFIX)/lib
- INCPATH  ?= $(PREFIX)/include
- DATAPATH ?= $(PREFIX)/share/doc/libtommath/pdf
- 
--#make the code coverage of the library
--#
--coverage: CFLAGS += -fprofile-arcs -ftest-coverage -DTIMING_NO_LOGS
--coverage: LFLAGS += -lgcov
--coverage: LDFLAGS += -lgcov
--
- coverage: $(COVERAGE)
- 	$(COVERAGE_APP)
- 
diff --git a/math/libtommath/pkg/PLIST b/math/libtommath/pkg/PLIST
index 2820f051a8e..da228bf8948 100644
--- a/math/libtommath/pkg/PLIST
+++ b/math/libtommath/pkg/PLIST
@@ -1,5 +1,3 @@
-@comment $OpenBSD: PLIST,v 1.3 2016/03/04 10:38:49 czarkoff Exp $
+@comment $OpenBSD: PLIST,v 1.4 2021/03/11 06:29:21 gkoehler Exp $
 include/tommath.h
-include/tommath_class.h
-include/tommath_superclass.h
-lib/libtommath.a
+@static-lib lib/libtommath.a