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ASA - Expanding Interface Subnet by changing the Netmask

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Hello,

I am using an ASA 5510 ver 8.4.1

One of the interfaces is configured with a IP address of 192.168.1.1 255.255.248.0 (/21)

We are looking to expand this subnet to make more hosts available. What would be the implications of changing the interface subnet mask from 255.255.248.0 to 255.255.240.0?

How will the related ACLs and other config entries be impacted by making this type of netmask change on the interface?

Will related entries be deleted?  Or, will I have to just modify related object-groups, ACLs, etc after the change on the interface?

Any assistance would be appreciated.