diff --git a/pkgs/applications/emulators/commanderx16/rom.nix b/pkgs/applications/emulators/commanderx16/rom.nix
index 5da77ebceefe..617c0a16b83c 100644
--- a/pkgs/applications/emulators/commanderx16/rom.nix
+++ b/pkgs/applications/emulators/commanderx16/rom.nix
@@ -2,20 +2,24 @@
 , lib
 , fetchFromGitHub
 , cc65
+, python3
 }:
 
 stdenv.mkDerivation rec {
   pname = "x16-rom";
-  version = "38";
+  version = "40";
 
   src = fetchFromGitHub {
     owner = "commanderx16";
     repo = pname;
     rev = "r${version}";
-    sha256 = "xaqF0ppB7I7ST8Uh3jPbC14uRAb/WH21tHlNeTvYpoI=";
+    hash = "sha256-5oqttuTJiJOUENncOJipAar22OsI1uG3G69m+eYoSh0=";
   };
 
-  nativeBuildInputs = [ cc65 ];
+  nativeBuildInputs = [
+    cc65
+    python3
+  ];
 
   postPatch = ''
     patchShebangs scripts/
@@ -25,8 +29,10 @@ stdenv.mkDerivation rec {
 
   installPhase = ''
     runHook preInstall
-    install -D --mode 444 --target-directory $out/share/${pname} build/x16/rom.bin
-    install -D --mode 444 --target-directory $out/share/doc/${pname} README.md
+
+    install -Dm 444 -t $out/share/${pname} build/x16/rom.bin
+    install -Dm 444 -t $out/share/doc/${pname} README.md
+
     runHook postInstall
   '';
 
@@ -35,7 +41,7 @@ stdenv.mkDerivation rec {
     description = "ROM file for CommanderX16 8-bit computer";
     license = licenses.bsd2;
     maintainers = with maintainers; [ AndersonTorres ];
-    platforms = cc65.meta.platforms;
+    inherit (cc65.meta) platforms;
   };
 
   passthru = {