diff --git a/mise.toml b/mise.toml
new file mode 100644
index 0000000..eac5712
--- /dev/null
+++ b/mise.toml
@@ -0,0 +1,5 @@
+# Pinned toolchain for deterministic builds (railpack/mise reads this).
+# node 24 = LTS, proven locally; node 26 broke /_global-error prerender.
+[tools]
+node = "24"
+bun = "1.3.14"
diff --git a/package.json b/package.json
index 435dad7..f211496 100755
--- a/package.json
+++ b/package.json
@@ -2,6 +2,10 @@
   "name": "nextjs_tailwind_shadcn_ts",
   "version": "0.2.1",
   "private": true,
+  "engines": {
+    "node": "24.x",
+    "bun": "1.3.x"
+  },
   "scripts": {
     "dev": "next dev -p 3000",
     "dev:log": "next dev -p 3000 2>&1 | tee dev.log",