diff --git a/packages/function/package.json b/packages/function/package.json
index d03d765d5..8d6218423 100644
--- a/packages/function/package.json
+++ b/packages/function/package.json
@@ -30,7 +30,7 @@
   ],
   "dependencies": {
     "@browserless/errors": "^10.9.7",
-    "isolated-function": "~0.1.39",
+    "isolated-function": "~0.1.46",
     "require-one-of": "~1.0.24"
   },
   "devDependencies": {
diff --git a/packages/function/src/function.js b/packages/function/src/function.js
index 8e223e008..57f361569 100644
--- a/packages/function/src/function.js
+++ b/packages/function/src/function.js
@@ -3,8 +3,12 @@
 const isolatedFunction = require('isolated-function')
 const template = require('./template')
 
+const [nodeMajor] = process.version.slice(1).split('.').map(Number)
+
 module.exports = async ({ url, code, vmOpts, browserWSEndpoint, ...opts }) => {
-  const [fn, teardown] = isolatedFunction(template(code), { ...vmOpts, throwError: false })
+  const needsNetwork = template.isUsingPage(code)
+  const allow = needsNetwork && nodeMajor >= 25 ? ['net'] : []
+  const [fn, teardown] = isolatedFunction(template(code), { ...vmOpts, allow, throwError: false })
   const result = await fn(url, browserWSEndpoint, opts)
   await teardown()
   return result
diff --git a/packages/function/src/index.js b/packages/function/src/index.js
index 3e9948942..d1cd07475 100644
--- a/packages/function/src/index.js
+++ b/packages/function/src/index.js
@@ -24,6 +24,10 @@ module.exports =
 
       return browserless.withPage((page, goto) => async () => {
         const { device } = await goto(page, { url, timeout, ...gotoOpts })
+
+        const browserWSEndpoint = (await browserless.browser()).wsEndpoint()
+        if (!browserWSEndpoint) throw new Error('Browser WebSocket endpoint not found')
+
         const result = await runFunction({
           url,
           code: stringify(fn),
diff --git a/packages/function/src/template.js b/packages/function/src/template.js
index da81adad6..253fcaf04 100644
--- a/packages/function/src/template.js
+++ b/packages/function/src/template.js
@@ -3,30 +3,34 @@
 const walk = require('acorn-walk')
 const acorn = require('acorn')
 
-module.exports = code => {
+const isUsingPage = code => {
   const ast = acorn.parse(code, { ecmaVersion: 2023, sourceType: 'module' })
 
-  let isUsingPage = false
+  let result = false
 
   walk.simple(ast, {
     ObjectPattern (node) {
       node.properties.forEach(prop => {
         if (prop.type === 'Property' && prop.key.name === 'page') {
-          isUsingPage = true
+          result = true
         }
         if (prop.type === 'RestElement' && prop.argument.name === 'page') {
-          isUsingPage = true
+          result = true
         }
       })
     },
     MemberExpression (node) {
       if (node.property.name === 'page' || node.property.value === 'page') {
-        isUsingPage = true
+        result = true
       }
     }
   })
 
-  if (!isUsingPage) return `async (url, _, opts) => (${code})(opts)`
+  return result
+}
+
+const template = code => {
+  if (!isUsingPage(code)) return `async (url, _, opts) => (${code})(opts)`
   return `
     async (url, browserWSEndpoint, opts) => {
       const puppeteer = require('@cloudflare/puppeteer')
@@ -40,3 +44,6 @@ module.exports = code => {
       }
     }`
 }
+
+module.exports = template
+module.exports.isUsingPage = isUsingPage
diff --git a/packages/function/test/index.js b/packages/function/test/index.js
index fa01dd7f7..a82ab0156 100644
--- a/packages/function/test/index.js
+++ b/packages/function/test/index.js
@@ -267,3 +267,17 @@ test('interact with npm modules', async t => {
   t.true(!!profiling)
   t.true(!!logging)
 })
+
+test('throws error when browser is launched with pipe mode', async t => {
+  const createTestUtil = require('@browserless/test/util/create')
+  const { getBrowser } = createTestUtil({ pipe: true })
+
+  const code = ({ page }) => page.title()
+
+  const myFn = browserlessFunction(code, {
+    getBrowserless: () => getBrowser()
+  })
+
+  const error = await t.throwsAsync(myFn(fileUrl))
+  t.is(error.message, 'Browser WebSocket endpoint not found')
+})