Why does the US government still use windows xp?

I get that it would be a hassle to update, but surely it would be worth it simply for the security. I mean, with such an old operating system, wouldn't the government be easily hacked? And wouldn't it be harder to hack if they updated to a more modern operating system like windows 10, 8 or even at least... show more I get that it would be a hassle to update, but surely it would be worth it simply for the security. I mean, with such an old operating system, wouldn't the government be easily hacked? And wouldn't it be harder to hack if they updated to a more modern operating system like windows 10, 8 or even at least windows 7?
Update: It just seems a little foolish to me not to update.
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