diff --git a/pkgs/games/xmage/default.nix b/pkgs/games/xmage/default.nix
index 531ef4cfb78b..59752e72e50d 100644
--- a/pkgs/games/xmage/default.nix
+++ b/pkgs/games/xmage/default.nix
@@ -2,33 +2,35 @@
 , stdenv
 , fetchurl
 , jdk8
-, unzip
+, unzrip
 }:
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "xmage";
-  version = "1.4.50V2";
+  version = "1.4.51-dev_2024-01-30_19-35";
 
   src = fetchurl {
-    url =
-      "https://github.com/magefree/mage/releases/download/xmage_${finalAttrs.version}/xmage_${finalAttrs.version}.zip";
-    sha256 = "sha256-t1peHYwCRy3wiIIwOD3nUyoxSOxbw6B/g++A1ofIbmg=";
+    url = "http://xmage.today/files/mage-full_${finalAttrs.version}.zip";
+    sha256 = "sha256-ogi0hd2FoulTnc3gg5cpLwr4Jln71YA0WBBZFOT6apg=";
   };
 
   preferLocalBuild = true;
 
   unpackPhase = ''
-    ${unzip}/bin/unzip $src
+    ${unzrip}/bin/unzrip $src
   '';
 
   installPhase = let
-    strVersion = lib.substring 0 6 finalAttrs.version;
+  # upstream maintainers forgot to update version, so manual override for now
+  # strVersion = lib.substring 0 6 finalAttrs.version;
+  strVersion = "1.4.50";
+
   in ''
     mkdir -p $out/bin
     cp -rv ./* $out
 
     cat << EOS > $out/bin/xmage
-    exec ${jdk8}/bin/java -Xms256m -Xmx512m -XX:MaxPermSize=384m -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -jar $out/mage-client/lib/mage-client-${strVersion}.jar
+    exec ${jdk8}/bin/java -Xms256m -Xmx1024m -XX:MaxPermSize=384m -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -jar $out/xmage/mage-client/lib/mage-client-${strVersion}.jar
     EOS
 
     chmod +x $out/bin/xmage