A 69-year-old woman with long-standing type 2 diabetes and hypertension is found to have an eGFR of 48 mL/min/1.73 m² and a urine albumin:creatinine ratio of 45 mg/mmol on two occasions. She is currently on Amlodipine for blood pressure control. Her blood pressure is 142/86 mmHg. What is the most appropriate change to her medication?