You installed a macOS update and now your MacBook won't connect to Wi-Fi at all — it either won't join your network, joins with no internet, or shows the Wi-Fi icon with an exclamation mark. This is one of the most common post-update problems, and in the large majority of cases it's a software state issue you can clear in a few minutes. Work through these fixes in order and stop when you're back online.
First, rule out the router
Before you touch the Mac, confirm another device (phone, tablet) can reach the internet on the same Wi-Fi. If nothing works, restart your router and modem (unplug 30 seconds, plug back in). If other devices are fine and only the freshly-updated Mac is offline, the update is the culprit — keep going.
The fixes, fastest first
1. Toggle Wi-Fi off and on, then restart
Click the Wi-Fi icon in the menu bar, turn Wi-Fi off, wait ten seconds, turn it back on. Then do a full restart (Apple menu → Restart) — not just closing the lid. A macOS update often finishes configuring network services on the first real reboot, and a surprising number of post-update Wi-Fi failures clear here.
2. Forget the network and rejoin
Open System Settings → Wi-Fi → Details (next to your network) → Forget This Network. Then reselect it and re-enter the password. Updates can leave a stale or partially-migrated network profile that refuses to authenticate; forgetting forces a clean join.
3. Renew the DHCP lease
If you connect but get "no internet" or a self-assigned IP, go to System Settings → Wi-Fi → Details → TCP/IP and click Renew DHCP Lease. This fixes the case where the Mac joins the network but never gets a working address from the router — a classic post-update symptom. (If you see a 169.254.x.x "self-assigned IP," see our dedicated guide on the Mac self-assigned IP address fix.)
4. Delete the network preference files
This clears corrupted network state that survives a reboot and is the single most effective fix for stubborn post-update Wi-Fi failures. In Finder, choose Go → Go to Folder and paste:
/Library/Preferences/SystemConfiguration/
Move these files to the Trash (you'll need your admin password), then restart — macOS rebuilds fresh copies on boot:
- com.apple.airport.preferences.plist
- com.apple.network.identification.plist (or NetworkInterfaces.plist)
- com.apple.wifi.message-tracer.plist
- preferences.plist
After the restart, rejoin your Wi-Fi network and re-enter the password. This resolves the majority of "worked before the update, dead after" cases.
5. Reset NVRAM (Intel Macs)
On Intel MacBooks, shut down, then power on and immediately hold Option + Command + P + R for about 20 seconds. NVRAM stores some network hardware settings that an update can leave in a bad state. Apple Silicon Macs manage this automatically on restart, so this step is Intel-only.
6. Add a public DNS server
If pages won't load but you're "connected," the update may have left broken DNS settings. In Wi-Fi → Details → DNS, add 1.1.1.1 and 8.8.8.8, then reconnect. If this fixes it, you were hitting a DNS problem, not a Wi-Fi one.
7. Run Wireless Diagnostics
Hold Option and click the Wi-Fi menu-bar icon → Open Wireless Diagnostics. It scans for interference, weak signal, and driver problems and writes a report. This won't fix things by itself, but it tells you whether you're looking at software or a genuine radio/antenna problem.
Is it an Apple driver bug?
Apple ships Wi-Fi driver and firmware code inside macOS updates, and several point releases across Sonoma, Ventura, and Sequoia have shipped with real Wi-Fi regressions that Apple fixed a release or two later. If the fixes above don't stick and you can confirm the Mac's Wi-Fi hardware is fine (it works on a Recovery-mode boot, or worked perfectly right up until the update), you may be on a buggy release. Check System Settings → General → Software Update for a newer point release — the fix is often already out.
If a fix isn't available yet and you're stuck, you can also try a clean reinstall of macOS over your existing data (it doesn't erase files) from Recovery, which replaces the driver files without deleting your account.
When it's actually the hardware
A macOS update can't physically break a Wi-Fi antenna — but the timing is sometimes a coincidence. If Wi-Fi is missing entirely (no networks appear, or the menu bar shows "No Wi-Fi hardware installed"), that points to a failing Wi-Fi card, a disconnected antenna cable in the display hinge, or a logic-board fault. Boot into Recovery mode (Apple Silicon: hold the power button; Intel: hold Command + R at startup) and check whether Wi-Fi appears there. No Wi-Fi in Recovery either almost always means hardware.
Dead Wi-Fi and a repair quote that isn't worth it?
A Wi-Fi antenna or logic-board repair on a MacBook can run $300–$600 at a shop — often more than an older machine is worth. If that's where you've landed, it's usually smarter to put that money toward a newer Mac. We buy MacBooks in almost any condition, including ones with dead Wi-Fi: get a number for a MacBook with broken Wi-Fi, and browse the Apple clearance deals on fully-tested refurbished MacBooks that just work out of the box.
Related guides
- MacBook Wi-Fi keeps dropping (connects, then disconnects)
- Safari says "You Are Not Connected to the Internet" (but you are)
- MacBook slow after a macOS update
- Stuck in the Setup Assistant loop after an update
Frequently Asked Questions
Why did my Wi-Fi stop working right after a macOS update?
Updates can leave corrupted network preference files, a stale network profile, or ship a temporary Wi-Fi driver bug. Deleting the SystemConfiguration preference files and restarting (fix 4) clears the software cases; a driver bug is fixed by the next macOS point release.
Will deleting the network preference files erase my data?
No. Those files only store network and Wi-Fi settings. macOS rebuilds them automatically on the next restart — you'll just re-enter your Wi-Fi password once.
How do I know if it's a software bug or broken Wi-Fi hardware?
Boot into Recovery mode and check if Wi-Fi works there. If it does, the problem is in your macOS install (software). If Wi-Fi is missing in Recovery too, it's almost certainly a hardware fault.
Should I roll back the macOS update?
Rolling back is difficult and risky (it usually means erasing and reinstalling the older version). Try the fixes above first, and check Software Update for a newer point release that fixes the bug — that's far safer than downgrading.