diff --git a/pkgs/applications/emulators/openmsx/default.nix b/pkgs/applications/emulators/openmsx/default.nix
index f054b954b59b..4dfa3b864430 100644
--- a/pkgs/applications/emulators/openmsx/default.nix
+++ b/pkgs/applications/emulators/openmsx/default.nix
@@ -13,26 +13,26 @@
 , libpng
 , libtheora
 , libvorbis
-, python
+, python3
 , tcl
 , zlib
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "openmsx";
-  version = "17.0";
+  version = "18.0";
 
   src = fetchFromGitHub {
     owner = "openMSX";
     repo = "openMSX";
-    rev = "RELEASE_${builtins.replaceStrings ["."] ["_"] version}";
-    sha256 = "sha256-9PdUNahJZ2O6ASkzLW/uudP3hiIzTDpxzFy6Pjb8JiU=";
+    rev = "RELEASE_${builtins.replaceStrings ["."] ["_"] finalAttrs.version}";
+    sha256 = "sha256-4V2B+OQbPVRmkRuqfeqyd+7pz9Z1YISjI79WqZS0Qhc=";
     fetchSubmodules = true;
   };
 
   nativeBuildInputs = [
     pkg-config
-    python
+    python3
   ];
 
   buildInputs = [
@@ -72,4 +72,4 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ AndersonTorres ];
     platforms = platforms.unix;
   };
-}
+})
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e13408727be4..eb8501ef1d20 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1464,9 +1464,7 @@ with pkgs;
 
   oberon-risc-emu = callPackage ../applications/emulators/oberon-risc-emu { };
 
-  openmsx = callPackage ../applications/emulators/openmsx {
-    python = python3;
-  };
+  openmsx = callPackage ../applications/emulators/openmsx { };
 
   packwiz = callPackage ../tools/games/minecraft/packwiz { };