diff --git a/pkgs/games/openttd/default.nix b/pkgs/games/openttd/default.nix
index 7aac53ae9403..61c7c0bb866c 100644
--- a/pkgs/games/openttd/default.nix
+++ b/pkgs/games/openttd/default.nix
@@ -29,11 +29,11 @@ let
 in
 stdenv.mkDerivation rec {
   pname = "openttd";
-  version = "12.2";
+  version = "13.0";
 
   src = fetchurl {
     url = "https://cdn.openttd.org/openttd-releases/${version}/${pname}-${version}-source.tar.xz";
-    hash = "sha256-gVCPDek6DCZLIW71agX4OB//e/+m0BASGiFJC02s6Vw=";
+    hash = "sha256-M5344OCCcIfIOv54+O/GpzsKPYqVCgtTE3zm6KrXq2c=";
   };
 
   nativeBuildInputs = [ cmake makeWrapper ];
@@ -83,6 +83,7 @@ stdenv.mkDerivation rec {
         - observe as spectators
     '';
     homepage = "https://www.openttd.org/";
+    changelog = "https://cdn.openttd.org/openttd-releases/${version}/changelog.txt";
     license = licenses.gpl2;
     platforms = platforms.linux;
     maintainers = with maintainers; [ jcumming fpletz ];
diff --git a/pkgs/games/openttd/jgrpp.nix b/pkgs/games/openttd/jgrpp.nix
index a0c70e463b20..12f4660ba3d4 100644
--- a/pkgs/games/openttd/jgrpp.nix
+++ b/pkgs/games/openttd/jgrpp.nix
@@ -2,13 +2,13 @@
 
 openttd.overrideAttrs (oldAttrs: rec {
   pname = "openttd-jgrpp";
-  version = "0.47.1";
+  version = "0.50.3";
 
   src = fetchFromGitHub rec {
     owner = "JGRennison";
     repo = "OpenTTD-patches";
     rev = "jgrpp-${version}";
-    hash = "sha256-AMd2KXy/ODByeV9CkEd51KbE/+fZ8Us3WzsWCnn7nh0=";
+    hash = "sha256-VJ8Qd4wiFbX/aY8pEWlh9wEjML0c7P8yrOC1fiQD7ts=";
   };
 
   buildInputs = oldAttrs.buildInputs ++ [ zstd ];