diff --git a/config.guess b/config.guess
index 15b97ce..cc7a810 100755
--- a/config.guess
+++ b/config.guess
@@ -2,7 +2,7 @@
 # Attempt to guess a canonical system name.
 #   Copyright 1992-2021 Free Software Foundation, Inc.
 
-timestamp='2021-04-16'
+timestamp='2021-04-21'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -953,7 +953,7 @@ EOF
 	if test "$?" = 0 ; then LIBC=gnulibc1 ; fi
 	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
 	exit ;;
-    arc:Linux:*:* | arceb:Linux:*:*)
+    arc:Linux:*:* | arceb:Linux:*:* | arc64:Linux:*:*)
 	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
 	exit ;;
     arm*:Linux:*:*)
diff --git a/config.sub b/config.sub
index 1c15fab..7a05edd 100755
--- a/config.sub
+++ b/config.sub
@@ -2,7 +2,7 @@
 # Configuration validation subroutine script.
 #   Copyright 1992-2021 Free Software Foundation, Inc.
 
-timestamp='2021-04-16'
+timestamp='2021-04-21'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -1165,7 +1165,7 @@ case $cpu-$vendor in
 			| alphapca5[67] | alpha64pca5[67] \
 			| am33_2.0 \
 			| amdgcn \
-			| arc | arceb \
+			| arc | arceb | arc64 \
 			| arm | arm[lb]e | arme[lb] | armv* \
 			| avr | avr32 \
 			| asmjs \
diff --git a/doc/config.guess.1 b/doc/config.guess.1
index 4a28bd3..5efc9df 100644
--- a/doc/config.guess.1
+++ b/doc/config.guess.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.16.
-.TH CONFIG.GUESS "1" "April 2021" "GNU config.guess (2021-04-16)" "User Commands"
+.TH CONFIG.GUESS "1" "April 2021" "GNU config.guess (2021-04-21)" "User Commands"
 .SH NAME
 config.guess \- guess the build system triplet
 .SH SYNOPSIS
diff --git a/doc/config.sub.1 b/doc/config.sub.1
index ebdbd09..9d0c81d 100644
--- a/doc/config.sub.1
+++ b/doc/config.sub.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.16.
-.TH CONFIG.SUB "1" "April 2021" "GNU config.sub (2021-04-16)" "User Commands"
+.TH CONFIG.SUB "1" "April 2021" "GNU config.sub (2021-04-21)" "User Commands"
 .SH NAME
 config.sub \- validate and canonicalize a configuration triplet
 .SH SYNOPSIS
diff --git a/testsuite/config-guess.data b/testsuite/config-guess.data
index b5282af..0b46924 100644
--- a/testsuite/config-guess.data
+++ b/testsuite/config-guess.data
@@ -36,6 +36,7 @@ amd64 | 7.0_RC1 | NetBSD | ignored | x86_64 | x86_64-unknown-netbsd7.0
 amd64 | 7.2.1 | Isilon OneFS | ignored | ignored | x86_64-unknown-onefs
 arc | ignored | Linux | ignored | ignored | arc-unknown-linux-gnu
 arceb | ignored | Linux | ignored | ignored | arceb-unknown-linux-gnu
+arc64 | ignored | Linux | ignored | ignored | arc64-unknown-linux-gnu
 arm | 12.0 | FreeBSD | ignored | armv6 | armv6-unknown-freebsd12.0-gnueabihf
 arm | 12.0 | FreeBSD | ignored | armv7 | armv7-unknown-freebsd12.0-gnueabihf
 arm | 12.1 | AROS | ignored | armv7 | arm-unknown-aros
diff --git a/testsuite/config-sub.data b/testsuite/config-sub.data
index 1d5908e..ca60ac5 100644
--- a/testsuite/config-sub.data
+++ b/testsuite/config-sub.data
@@ -59,9 +59,14 @@ amix						m68k-unknown-sysv4
 apollo68					m68k-apollo-sysv
 apollo68bsd					m68k-apollo-bsd
 arc						arc-unknown-none
+arc-elf						arc-unknown-elf
 arc-linux					arc-unknown-linux-gnu
 arceb						arceb-unknown-none
+arceb-elf					arceb-unknown-elf
 arceb-linux					arceb-unknown-linux-gnu
+arc64						arc64-unknown-none
+arc64-elf					arc64-unknown-elf
+arc64-linux					arc64-unknown-linux-gnu
 arm						arm-unknown-none
 arm-cegcc					arm-unknown-cegcc
 arm-coff					arm-unknown-coff