Yes, but only by signing a document called a Codicil. This must be prepared, signed and executed in a particular way. You do not need a Codicil if you or any person named in your Will changes their address. A Codicil is only useful where there’s minor changes to your Will.
At Cornerstone Wills we recommend that a new Will is drafted in all circumstances rather than drafting a Codicil as there is greater opportunity to lose one or both of the Will or Codicil. Also, there is greater risk that Codicils can be conveniently destroyed, e.g. by a disaffected beneficiary!