diff --git a/package.json b/package.json
index 65f155f..8b9a001 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,9 @@
   "private": true,
   "type": "module",
   "description": "EPPP — a modular personal blogging platform. Workspace bootstrap (E00-S01).",
+  "engines": {
+    "node": ">=24.0.0 <25.0.0"
+  },
   "scripts": {
     "build": "pnpm -r run build",
     "test": "node --test \"tests/**/*.test.mjs\"",
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 9cf8977..8db344c 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -2,3 +2,8 @@ packages:
   - 'apps/*'
   - 'packages/*'
   - 'extensions/*'
+
+# E00-S01-T08 — reject installs on unsupported Node versions instead of
+# warning: root package.json restricts engines.node to 24.x, and engineStrict
+# turns a mismatch into a hard install error (ERR_PNPM_UNSUPPORTED_ENGINE).
+engineStrict: true