diff --git a/pkgs/by-name/ku/kulala-core/package.nix b/pkgs/by-name/ku/kulala-core/package.nix
index 438c922eba3f..1a9af47f754b 100644
--- a/pkgs/by-name/ku/kulala-core/package.nix
+++ b/pkgs/by-name/ku/kulala-core/package.nix
@@ -10,7 +10,7 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "kulala-core";
-  version = "0.7.0";
+  version = "0.13.0";
 
   strictDeps = true;
   __structuredAttrs = true;
@@ -19,7 +19,7 @@ stdenv.mkDerivation (finalAttrs: {
     owner = "mistweaverco";
     repo = "kulala-core";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-zY/Yg/1s/pyyuKxtUa2cIzLCraSNSzpPMBx9EbGIIGI=";
+    hash = "sha256-pUBG8tlybpd/YPArIssCEy5Op47MVPLJsOOolVItZpU=";
   };
 
   node_modules = stdenv.mkDerivation {
@@ -78,11 +78,13 @@ stdenv.mkDerivation (finalAttrs: {
 
     cp -R ${finalAttrs.node_modules}/node_modules .
     echo '{ "version": "${finalAttrs.version}" }' > packages/core/version.json
-    bun build src/cli.ts \
-      --define __KULALA_EMBED_CURL__=false \
-      --target bun \
-      --outfile dist/kulala-core.js \
-      --cwd packages/core
+    (
+      cd packages/core
+      bun build src/cli.ts \
+        --target=bun \
+        --outdir=dist \
+        --asset-naming='[name].[ext]'
+    )
 
     runHook postBuild
   '';
@@ -90,7 +92,8 @@ stdenv.mkDerivation (finalAttrs: {
   installPhase = ''
     runHook preInstall
 
-    install -Dm644 packages/core/dist/kulala-core.js $out/lib/kulala-core/kulala-core.js
+    install -Dm644 packages/core/dist/cli.js $out/lib/kulala-core/kulala-core.js
+    install -Dm644 packages/core/dist/liblua5.1.wasm $out/lib/kulala-core/liblua5.1.wasm
     makeWrapper ${lib.getExe bun} $out/bin/kulala-core \
       --add-flags $out/lib/kulala-core/kulala-core.js \
       --set KULALA_CURL_PATH ${lib.getExe curl}