diff --git a/pkgs/by-name/op/openmsx/package.nix b/pkgs/by-name/op/openmsx/package.nix
index c05b882b9634..0680d48ebecd 100644
--- a/pkgs/by-name/op/openmsx/package.nix
+++ b/pkgs/by-name/op/openmsx/package.nix
@@ -20,13 +20,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "openmsx";
-  version = "19.1";
+  version = "20_0";
 
   src = fetchFromGitHub {
     owner = "openMSX";
     repo = "openMSX";
     rev = "RELEASE_${builtins.replaceStrings ["."] ["_"] finalAttrs.version}";
-    hash = "sha256-5ULljLmEDGFp32rnrXKLfL6P3ad2STJUNngBuWlRCbc=";
+    hash = "sha256-iY+oZ7fHZnnEGunM4kOxOGH2Biqj2PfdLhbT8J4mYrA=";
     fetchSubmodules = true;
   };