diff --git a/package.json b/package.json
index bcb2724b5..f04e06b81 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   },
   "scripts": {
     "toolchain:check": "node scripts/check-node-toolchain.mjs",
-    "install:all": "npm ci --prefix backend && npm ci --prefix frontend && npm ci --prefix website",
+    "install:all": "node scripts/install-all.mjs",
     "test": "npm run test:workflow-sources && npm run test:public-content && npm run test:release-manifest && npm run test:operations && npm run test:evaluation && npm run test:final && npm run test:baseline && npm run test:chat --prefix backend && npm run test:legal-sources --prefix backend && npm run test:security --prefix backend",
     "test:evaluation": "node --test tests/evaluation/*.test.mjs && node scripts/evaluate-ontario.mjs --check && node scripts/check-professional-validation.mjs && node scripts/check-release-readiness.mjs",
     "evaluate:ontario": "node scripts/evaluate-ontario.mjs",
diff --git a/scripts/install-all.mjs b/scripts/install-all.mjs
new file mode 100644
index 000000000..b835ececc
--- /dev/null
+++ b/scripts/install-all.mjs
@@ -0,0 +1,55 @@
+import { spawnSync } from "node:child_process";
+import { rmSync } from "node:fs";
+
+const workspaces = ["backend", "frontend", "website"];
+const maxAttempts = 3;
+const npmCommand = process.platform === "win32" ? "npm.cmd" : "npm";
+
+const pause = (milliseconds) =>
+  new Promise((resolve) => setTimeout(resolve, milliseconds));
+
+for (const workspace of workspaces) {
+  let installed = false;
+  let lastStatus = 1;
+
+  for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
+    console.log(
+      `Installing ${workspace} dependencies (attempt ${attempt}/${maxAttempts})...`,
+    );
+
+    const result = spawnSync(npmCommand, ["ci", "--prefix", workspace], {
+      env: process.env,
+      stdio: "inherit",
+    });
+
+    if (result.error) {
+      console.error(`Failed to start npm for ${workspace}:`, result.error);
+    }
+
+    lastStatus = result.status ?? 1;
+    if (lastStatus === 0) {
+      installed = true;
+      break;
+    }
+
+    if (attempt < maxAttempts) {
+      console.warn(
+        `${workspace} dependency installation failed; cleaning node_modules before retry.`,
+      );
+      rmSync(`${workspace}/node_modules`, {
+        force: true,
+        maxRetries: 3,
+        recursive: true,
+        retryDelay: 250,
+      });
+      await pause(attempt * 2_000);
+    }
+  }
+
+  if (!installed) {
+    console.error(
+      `${workspace} dependency installation failed after ${maxAttempts} attempts.`,
+    );
+    process.exit(lastStatus);
+  }
+}
diff --git a/tests/baseline/ross-website-contract.test.mjs b/tests/baseline/ross-website-contract.test.mjs
index 4454f7c8a..f30540660 100644
--- a/tests/baseline/ross-website-contract.test.mjs
+++ b/tests/baseline/ross-website-contract.test.mjs
@@ -11,13 +11,16 @@ const json = (path) => JSON.parse(read(path));
 test("the public website is a separate build target", () => {
   const rootPackage = json("package.json");
   const websitePackage = json("website/package.json");
+  const installer = read("scripts/install-all.mjs");
   assert.equal(existsSync(resolve(root, "website/.openai/hosting.json")), true);
   assert.equal(
     existsSync(resolve(root, "website/build/sites-vite-plugin.ts")),
     true,
   );
   assert.equal(websitePackage.name, "ross-ontario");
-  assert.match(rootPackage.scripts["install:all"], /--prefix website/);
+  assert.match(rootPackage.scripts["install:all"], /scripts\/install-all\.mjs/);
+  assert.match(installer, /\["backend", "frontend", "website"\]/);
+  assert.match(installer, /\["ci", "--prefix", workspace\]/);
   assert.match(rootPackage.scripts.build, /build:website/);
   assert.match(rootPackage.scripts.lint, /lint:website/);
   assert.match(rootPackage.scripts.check, /test:website/);
@@ -87,7 +90,7 @@ test("the website scaffold exposes every governed public route", () => {
     "readiness",
   ];
   for (const key of requiredKeys) {
-    assert.match(content, new RegExp(`[\"']?${key}[\"']?\\s*:`), key);
+    assert.match(content, new RegExp(`["']?${key}["']?\\s*:`), key);
   }
 
   const route = read("website/app/[...slug]/page.tsx");