Cisco 2960x Stack Question

I have 5 switches I want to stack. (no cisco expert here)

3 of the switches are on 15.2(4)e6

1 is on 15.2(6)e2

1 is on 15.2(4)e1

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Before I get started wanted to make sure all the updates were done, at the current state do I need to do any updates since they all are 15.2?

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Thanks in advance!!