Councillors Mina Najmi and Ella Simmons left the council in 2020, leading to a by-election for their Pemberton ward seats on 6 May 2021.[6] The by-election saw Christopher Beer (Labour) and Samantha Nurse (Independent) elected.[7]
Following the death of Carol Rees in 2021, Alexander Evans (originally independent but joined Plaid Cymru soon after) was co-opted to serve as a member for the Glyn ward.
Although originally elected under a Labour ticket, Sharen Davies and Jason Hart left the party and became independent members in 2018 and 2021 respectively. Jordan Randall was originally elected as a Plaid Cymru candidate but moved to the Conservative party. Ian Wooldridge also crossed from Plaid Cymru to Labour during his term of office.