How to Upgrade the Vault Door in Fallout Shelter
Upgrading your vault door in Fallout Shelter is pretty simple but super important to keep those nasty raiders and critters out. Just tap on your Vault Door room and look for the upgrade icon (it looks like an arrow pointing upwards). If you've got enough caps, you can upgrade it for better defense. Keep in mind, though, upgrading doesn't make it invincible, but it does give you more time to react to threats.
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Just click on the vault door and hit upgrade. You need caps, though. Keep it strong!
Honestly, upgrading the vault door isn't worth it. Better to focus on your dwellers' weapons and training. Raiders will get in anyway.
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