diff --git a/flake.nix b/flake.nix
index 13f1e3f..7445ae5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -40,10 +40,10 @@
 
       perSystem = pkgs: {
         sourcemods = pkgs.lib.mapAttrs (name: sdk: pkgs.sourcemod.override {sdks = {${name} = sdk;};}) pkgs.hl2sdk;
-        metamods = pkgs.lib.mapAttrs (name: sdk: pkgs.metamod-source.override {sdks = {${name} = sdk;};}) pkgs.hl2sdk;
+        metamods = pkgs.lib.mapAttrs (name: sdk: pkgs.metamod-source-builder {${name} = sdk;}) pkgs.hl2sdk;
       };
 
-      packages = inheritPkgs ["ambuild" "hl2sdk" "sourcepawn" "sourcemod-includes" "sourcemod-include-library" "srcds-tf2"];
+      packages = inheritPkgs ["ambuild" "hl2sdk" "sourcepawn" "metamod-source" "sourcemod" "sourcemod-includes" "sourcemod-include-library" "srcds-tf2"];
 
       checks = {
         buildTestScript = {pkgs, ...}:
diff --git a/nix/sourcemod/metamod-source.nix b/nix/sourcemod/metamod-source.nix
index 78372cd..ae0c943 100644
--- a/nix/sourcemod/metamod-source.nix
+++ b/nix/sourcemod/metamod-source.nix
@@ -5,10 +5,9 @@
   git,
   fetchpatch2,
   symlinkJoin,
-  sdks ? {},
-}: let
+}: sdks: let
   inherit (builtins) attrNames concatStringsSep attrValues;
-  sdkNames = attrNames sdks;
+  sdkNames = concatStringsSep "," (attrNames sdks);
   combinedSdks = symlinkJoin {
     name = "hl2sdk-${concatStringsSep "-" (attrNames sdks)}";
     paths = attrValues sdks;
@@ -45,7 +44,7 @@ in
     buildPhase = ''
       mkdir build
       cd build
-      python ../configure.py --sdks ${concatStringsSep "," sdkNames} --hl2sdk-root=${combinedSdks} --disable-auto-versioning
+      python ../configure.py --sdks=${sdkNames} --hl2sdk-root=${combinedSdks} --disable-auto-versioning
       ambuild
     '';
 
diff --git a/nix/sourcemod/overlay.nix b/nix/sourcemod/overlay.nix
index 83abc0d..f53992b 100644
--- a/nix/sourcemod/overlay.nix
+++ b/nix/sourcemod/overlay.nix
@@ -4,7 +4,8 @@ final: prev: {
     inherit (final.stdenvNoCC) mkDerivation;
   };
   ambuild = final.python3Packages.callPackage ./ambuild.nix {};
-  metamod-source = final.callPackage ./metamod-source.nix {};
+  metamod-source = final.callPackage ./metamod-source.nix {} {};
+  metamod-source-builder = final.callPackage ./metamod-source.nix {};
   sourcemod = final.callPackage ./sourcemod.nix {};
   sourcepawn = final.callPackage ./sourcepawn.nix {};
   sourcemod-includes = final.callPackage ./includes/sourcemod-includes.nix {};
diff --git a/update-all.nu b/update-all.nu
index 10a2605..1edc513 100755
--- a/update-all.nu
+++ b/update-all.nu
@@ -1,8 +1,10 @@
 #! /usr/bin/env nu
 
 def main [] {
-    let sdks = open nix/sourcemod/hl2sdks.json | columns
-    $sdks | each {|sdk| update_sdk $sdk}
+    update_metamod
+
+    # let sdks = open nix/sourcemod/hl2sdks.json | columns
+    # $sdks | each {|sdk| update_sdk $sdk}
 }
 
 def update_sdk [sdk: string] {
@@ -15,3 +17,13 @@ def update_sdk [sdk: string] {
     nix-update --flake --use-update-script $"hl2sdk.($sdk)"
     nix build .#sourcemods.x86_64-linux.tf2
 }
+
+def update_metamod [] {
+    let html = http get https://www.metamodsource.net/downloads.php/?branch=stable
+    let branch = $html | query web --query h3 | first | first | parse --regex "from (?P<branch>[0-9.]+) Branch" | get branch | first
+    let build = $html | query web --as-table [Build] | get Build | first
+    print $"Updating metamod-source to ($branch).0.($build)"
+    nix-update --flake --version=$"($branch).0.($build)" metamod-source
+
+    nom build .#metamods.x86_64-linux.tf2
+}