A 70-year-old woman with CKD stage 3b and poorly controlled hypertension is started on ramipril. Two weeks later, creatinine rises from 120 µmol/L to 150 µmol/L and potassium from 4.5 to 5.0 mmol/L. She is asymptomatic. According to CKD and hypertension guidance, what is the most appropriate management?