diff --git a/pkgs/tools/system/plan9port/default.nix b/pkgs/tools/system/plan9port/default.nix
index 3e52d10a240b..b4a277eeec4e 100644
--- a/pkgs/tools/system/plan9port/default.nix
+++ b/pkgs/tools/system/plan9port/default.nix
@@ -7,13 +7,13 @@
 
 stdenv.mkDerivation rec {
   pname = "plan9port";
-  version = "2021-10-19";
+  version = "2022-09-12";
 
   src = fetchFromGitHub {
     owner = "9fans";
     repo = pname;
-    rev = "d0d440860f2000a1560abb3f593cdc325fcead4c";
-    hash = "sha256-2aYXqPGwrReyFPrLDtEjgQd/RJjpOfI3ge/tDocYpRQ=";
+    rev = "ffbdd1aa20c8a20a8e9dcd3cec644b6dfa3c6acb";
+    hash = "sha256-Lq5B4VYUetkHwhFX2EaLr33wR1aLIiVn8OBobxjFt7I=";
   };
 
   postPatch = ''
@@ -67,7 +67,7 @@ stdenv.mkDerivation rec {
 
   buildPhase = ''
     runHook preBuild
-    ./INSTALL -b
+    PLAN9_TARGET=$out/plan9 ./INSTALL -b
     runHook postBuild
   '';