Story highlights Colombian voters narrowly rejected a referendum Sunday

Final results showed a little more than 50% voted no

(CNN) Colombian President Juan Manuel Santos announced Tuesday that the ceasefire signed with Marxist rebel group FARC will expire at the end of the month.

"I hope that we can advance in our accords and dialogues so that we can settle on the arrangements, and the agreements that allow us to put in place a solution to this conflict," Santos said in a televised statement.

Colombia was thrown into disarray Sunday after voters narrowly rejected a referendum on the deal brokered between the government and FARC to end a 52-year war. Final results showed a little more than 50% of voters chose "no."

On Wednesday, Santos will meet with opposition leader and former president Alvaro Uribe. Santos will also meet with former president Andrés Pastrana Arango, who also opposed the peace deal.

Reworking the peace deal

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