Increasing security deposits

[Jacky Johnson]

If I (the landlord) haven't increased the security deposit for a few years now after increasing the tenant's rent annually and now I want to increase it to match the amount of tenant's current monthly rent, how should I do it? Should I send the tenant an email describing it that constitutes a 30-day notice to increase the security deposit? Or should I send a certified mail or deliver it in person? What other requirements do I need in this situation to increase the security deposit? What if the tenant refused to pay? Thanks.