diff --git a/.quixos-subtree-source.json b/.quixos-subtree-source.json
index 8f76827..babc4be 100644
--- a/.quixos-subtree-source.json
+++ b/.quixos-subtree-source.json
@@ -1,7 +1,7 @@
 {
   "version": 1,
   "sourceRepo": "https://gitea-external.egads.tutti.syntaxblitz.net/quixos/quixos.git",
-  "sourceCommit": "eb407e5a3bbd4ae2f810a0cee0d45b5c7e8d7db1",
+  "sourceCommit": "398fd9e0d723c3fe7a511c2c35702874fd7342d0",
   "sourcePath": "quixos-instance/quixos-nix-helpers",
   "exportName": "quixos-nix-helpers",
   "mirrorRemote": "https://gitea-external.egads.tutti.syntaxblitz.net/quixos/quixos-nix-helpers.git"
diff --git a/quixos-package-helpers.nix b/quixos-package-helpers.nix
index 09776a9..e81887e 100644
--- a/quixos-package-helpers.nix
+++ b/quixos-package-helpers.nix
@@ -595,12 +595,22 @@ EOF
           installConfig.libexecName or (lib.strings.sanitizeDerivationName packageNameFinal);
         serverFile = installConfig.serverFile or bundleOutfile;
         descriptorPath = installConfig.descriptorPath or "descriptor.quixos-package.txtpb";
+        extraFiles = installConfig.extraFiles or [ ];
+        installExtraFile = file:
+          let
+            source = toString file.source;
+            target = file.target or (baseNameOf source);
+            mode = file.mode or "0644";
+          in ''
+            install -Dm${toString mode} ${lib.escapeShellArg source} "$out/libexec/${serverLibexecName}/${target}"
+          '';
         installServerPhase =
           if installServer == null
           then null
           else ''
             runHook preInstall
             install -Dm755 ${lib.escapeShellArg serverFile} "$out/libexec/${serverLibexecName}/${serverFile}"
+            ${lib.concatMapStringsSep "\n" installExtraFile extraFiles}
             mkdir -p "$out/bin"
             cat > "$out/bin/${serverBin}" <<EOF
 #!${pkgs.runtimeShell}