Security Deposit for Lease Renewal & Rent Increase

[Meenoo Vana]

Hi,

I am a year old landlord. I am yet to send out a renewed lease to the tenants. Per market standards, I have notified tenants of the rent increase and they have agreed. Now, I am not sure how much am I allowed to receive as security deposit for the new lease. PA law states, I can charge SD of 2 months for first year and one month for subsequent years. Does that mean, I can charge the whole month of rent as SD for the new lease or just the difference from increased rent amount to the old? Please guide me through. Thanks for any help!