diff --git a/pkgs/tools/system/plan9port/darwin-cfframework.patch b/pkgs/tools/system/plan9port/darwin-cfframework.patch
deleted file mode 100644
index 01541af92e37..000000000000
--- a/pkgs/tools/system/plan9port/darwin-cfframework.patch
+++ /dev/null
@@ -1,24 +0,0 @@
-From d1f0bd3de7d3d54523aeefd9731ea850d20eaab4 Mon Sep 17 00:00:00 2001
-From: Jason Felice <jason.m.felice@gmail.com>
-Date: Tue, 2 Jul 2019 13:19:23 -0400
-Subject: [PATCH] Need CoreFoundation
-
----
- src/cmd/devdraw/cocoa-screen.m | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/src/cmd/devdraw/cocoa-screen.m b/src/cmd/devdraw/cocoa-screen.m
-index 97128da2..0e380dd3 100644
---- a/src/cmd/devdraw/cocoa-screen.m
-+++ b/src/cmd/devdraw/cocoa-screen.m
-@@ -56,6 +56,7 @@
- #endif
- 
- AUTOFRAMEWORK(Cocoa)
-+AUTOFRAMEWORK(CoreFoundation)
- 
- #define LOG	if(0)NSLog
- #define panic	sysfatal
--- 
-2.21.0
-
diff --git a/pkgs/tools/system/plan9port/darwin-sw_vers.patch b/pkgs/tools/system/plan9port/darwin-sw_vers.patch
deleted file mode 100644
index 3e61c83e5403..000000000000
--- a/pkgs/tools/system/plan9port/darwin-sw_vers.patch
+++ /dev/null
@@ -1,47 +0,0 @@
-From d21d082275f04f88eabcc8ecdb03ee932c71ebf1 Mon Sep 17 00:00:00 2001
-From: Jason Felice <jason.m.felice@gmail.com>
-Date: Mon, 1 Jul 2019 15:23:19 -0400
-Subject: [PATCH 2/3] Build for 10.12
-
----
- bin/osxvers                    | 3 +--
- src/cmd/devdraw/mkwsysrules.sh | 4 ++--
- 2 files changed, 3 insertions(+), 4 deletions(-)
-
-diff --git a/bin/osxvers b/bin/osxvers
-index 4af44da2..3be7e6e9 100755
---- a/bin/osxvers
-+++ b/bin/osxvers
-@@ -2,6 +2,5 @@
- 
- u=`uname`
- case "$u" in
--Darwin)
--	sw_vers | awk '$1 == "ProductVersion:" {print $2}' | awk -F. '{printf("CFLAGS=$CFLAGS -DOSX_VERSION=%d%02d%02d\n", $1, $2, $3)}'
-+Darwin) printf 'CFLAGS=$CFLAGS -DOSX_VERSION=101200\n';;
- esac
-diff --git a/src/cmd/devdraw/mkwsysrules.sh b/src/cmd/devdraw/mkwsysrules.sh
-index e94afbd3..40e632db 100644
---- a/src/cmd/devdraw/mkwsysrules.sh
-+++ b/src/cmd/devdraw/mkwsysrules.sh
-@@ -22,7 +22,7 @@ fi
- 
- if [ "x$WSYSTYPE" = "x" ]; then
- 	if [ "x`uname`" = "xDarwin" ]; then
--		if sw_vers | grep 'ProductVersion:	10\.[0-5]\.' >/dev/null; then
-+		if false; then
- 			echo 1>&2 'OS X 10.5 and older are not supported'
- 			exit 1
- 		else
-@@ -54,7 +54,7 @@ if [ $WSYSTYPE = x11 ]; then
- 	XO=`ls x11-*.c 2>/dev/null | sed 's/\.c$/.o/'`
- 	echo 'WSYSOFILES=$WSYSOFILES '$XO
- elif [ $WSYSTYPE = osx-cocoa ]; then
--	if sw_vers|awk '/ProductVersion/{split($2,a,".");exit(a[2]<14)}' >/dev/null; then	# 0 is true in sh.
-+	if false; then
- 		echo 'OBJCFLAGS=$OBJCFLAGS -fobjc-arc'
- 		echo 'WSYSOFILES=$WSYSOFILES osx-draw.o cocoa-screen-metal-objc.o cocoa-srv.o cocoa-thread.o'
- 	else
--- 
-2.21.0
-
diff --git a/pkgs/tools/system/plan9port/default.nix b/pkgs/tools/system/plan9port/default.nix
index 2b0df3c893ea..78db6e2037ee 100644
--- a/pkgs/tools/system/plan9port/default.nix
+++ b/pkgs/tools/system/plan9port/default.nix
@@ -11,20 +11,15 @@
 
 stdenv.mkDerivation {
   pname = "plan9port";
-  version = "2020-01-08";
+  version = "2021-04-22";
 
   src =  fetchFromGitHub {
     owner = "9fans";
     repo = "plan9port";
-    rev = "cc3d97d52a72d7eaceb5b636bcdf81c3e19f7a2e";
-    sha256 = "0gb55kj0gzx1kdhiwcrbr7xcgz1im21dyxgxhfhh6d0q9rw0c17g";
+    rev = "70cc6e5ba7798b315c3fb3aae19620a01604a459";
+    hash = "sha256-HCn8R9YSocHrpw/xK5n8gsCLSAbAQgw0NtjO9vYIbKo=";
   };
 
-  patches = [
-    ./darwin-sw_vers.patch
-    ./darwin-cfframework.patch
-  ];
-
   postPatch = ''
     #hardcoded path
     substituteInPlace src/cmd/acme/acme.c \
@@ -86,10 +81,16 @@ stdenv.mkDerivation {
       Plan 9 from User Space (aka plan9port) is a port of many Plan 9 programs
       from their native Plan 9 environment to Unix-like operating systems.
     '';
-    license = licenses.lpl-102;
-    maintainers = with maintainers; [ AndersonTorres bbarker
-                                      ftrvxmtrx kovirobi ];
+    license = licenses.mit;
+    maintainers = with maintainers; [
+      AndersonTorres
+      bbarker
+      ehmry
+      ftrvxmtrx
+      kovirobi
+    ];
     platforms = platforms.unix;
+    broken = stdenv.isDarwin;
   };
 }
 # TODO: investigate the mouse chording support patch