diff --git a/agora/Agora/Proposal/Scripts.hs b/agora/Agora/Proposal/Scripts.hs
index af040d1..685238e 100644
--- a/agora/Agora/Proposal/Scripts.hs
+++ b/agora/Agora/Proposal/Scripts.hs
@@ -13,11 +13,19 @@ module Agora.Proposal.Scripts (
 import Agora.Proposal (
   PProposalDatum (PProposalDatum),
   PProposalRedeemer (..),
+  PProposalStatus (..),
   PProposalVotes (PProposalVotes),
   Proposal (governorSTAssetClass, stakeSTAssetClass),
-  ProposalStatus (VotingReady),
+  ProposalStatus (..),
+  pwinner,
+ )
+import Agora.Proposal.Time (
+  currentProposalTime,
+  isDraftPeriod,
+  isExecutionPeriod,
+  isLockingPeriod,
+  isVotingPeriod,
  )
-import Agora.Proposal.Time (currentProposalTime, isVotingPeriod)
 import Agora.Stake (PProposalLock (..), PStakeDatum (..), findStakeOwnedBy)
 import Agora.Utils (
   findTxOutByTxOutRef,
@@ -368,5 +376,89 @@ proposalValidator proposal =
         PUnlock _r ->
           popaque (pconstant ())
         --------------------------------------------------------------------------
-        PAdvanceProposal _r ->
-          popaque (pconstant ())
+        PAdvanceProposal _r -> unTermCont $ do
+          tcassert "No stake input is allowed" $ spentStakeST #== 0
+
+          currentTime <- tclet $ currentProposalTime # txInfoF.validRange
+          proposalOutStatus <- tclet $ pfield @"status" # proposalOut
+
+          thresholdsF <- tcont $ pletFields @'["execute", "draft", "vote"] proposalF.thresholds
+
+          let -- Only the status of proposals should be updated in this case.
+              templateProposalOut =
+                mkRecordConstr
+                  PProposalDatum
+                  ( #proposalId .= proposalF.proposalId
+                      .& #effects .= proposalF.effects
+                      .& #status .= proposalOutStatus
+                      .& #cosigners .= proposalF.cosigners
+                      .& #thresholds .= proposalF.thresholds
+                      .& #votes .= proposalF.votes
+                      .& #timingConfig .= proposalF.timingConfig
+                      .& #startingTime .= proposalF.startingTime
+                  )
+
+          tcassert "Only status changes in the output proposal" $
+            templateProposalOut #== proposalOut
+
+          inDraftPeriod <- tclet $ isDraftPeriod # proposalF.timingConfig # proposalF.startingTime # currentTime
+          inVotingPeriod <- tclet $ isVotingPeriod # proposalF.timingConfig # proposalF.startingTime # currentTime
+          inLockedPeriod <- tclet $ isLockingPeriod # proposalF.timingConfig # proposalF.startingTime # currentTime
+          inExecutionPeriod <- tclet $ isExecutionPeriod # proposalF.timingConfig # proposalF.startingTime # currentTime
+
+          -- Check the timings.
+          let isFinished = proposalF.status #== pconstantData Finished
+
+              notTooLate = pmatch (pfromData proposalF.status) $ \case
+                PDraft _ -> inDraftPeriod
+                PVotingReady _ -> inVotingPeriod
+                PLocked _ -> inExecutionPeriod
+                _ -> pconstant False
+
+          tcassert "Finished proposals cannnot be advanced" $ pnot # isFinished
+
+          pure $
+            pif
+              notTooLate
+              -- On time: advance to next status.
+              ( pmatch (pfromData proposalF.status) $ \case
+                  PDraft _ -> unTermCont $ do
+                    -- TODO: Perform other necessary checks.
+
+                    -- 'Draft' -> 'VotingReady'
+                    tcassert "Proposal status set to VotingReady" $
+                      proposalOutStatus #== pconstantData VotingReady
+
+                    pure $ popaque (pconstant ())
+                  PVotingReady _ -> unTermCont $ do
+                    -- 'VotingReady' -> 'Locked'
+                    tcassert "Proposal status set to Locked" $
+                      proposalOutStatus #== pconstantData Locked
+
+                    -- Check that the highest votes meet the minimum requirement.
+                    let winner = mustBePJust # "Highest votes not found" #$ pwinner # proposalF.votes
+                        highestVotes = pfromData $ psndBuiltin # winner
+
+                    tcassert "Highest vote count should exceed the threshold" $
+                      pto (pto $ pfromData thresholdsF.execute) #< highestVotes
+
+                    pure $ popaque (pconstant ())
+                  PLocked _ -> unTermCont $ do
+                    -- 'Locked' -> 'Finished'
+                    tcassert "Proposal status set to Finished" $
+                      proposalOutStatus #== pconstantData Finished
+
+                    tcassert "Can only unlock after the locking period" $
+                      pnot # inLockedPeriod
+
+                    -- TODO: Perform other necessary checks.
+                    pure $ popaque (pconstant ())
+                  _ -> popaque (pconstant ())
+              )
+              -- Too late: failed proposal, status set to 'Finished'.
+              ( popaque $
+                  ptraceIfFalse "Proposal should fail: not on time" $
+                    proposalOutStatus #== pconstantData Finished
+                    -- TODO: Should check that the GST is not moved
+                    --        if the proposal is in 'Locked' state.
+              )
diff --git a/bench.csv b/bench.csv
index 904b717..023f8a5 100644
--- a/bench.csv
+++ b/bench.csv
@@ -2,15 +2,15 @@ name,cpu,mem,size
 Agora/Effects/Treasury Withdrawal Effect/effect/Simple,340268715,724428,3050
 Agora/Effects/Treasury Withdrawal Effect/effect/Simple with multiple treasuries ,570029812,1211300,3377
 Agora/Effects/Treasury Withdrawal Effect/effect/Mixed Assets,502351827,1071087,3242
-Agora/Effects/Governor Mutation Effect/validator/valid new governor datum/governor validator should pass,103830462,228928,7628
+Agora/Effects/Governor Mutation Effect/validator/valid new governor datum/governor validator should pass,103830462,228928,7532
 Agora/Effects/Governor Mutation Effect/validator/valid new governor datum/effect validator should pass,127968605,266935,3358
 Agora/Stake/policy/stakeCreation,59776675,126049,2116
 Agora/Stake/validator/stakeDepositWithdraw deposit,276249331,599197,4024
 Agora/Stake/validator/stakeDepositWithdraw withdraw,276249331,599197,4016
 Agora/Proposal/policy/proposalCreation,34784356,68894,1523
-Agora/Proposal/validator/cosignature/proposal,241204796,510319,4812
+Agora/Proposal/validator/cosignature/proposal,241651391,511819,5772
 Agora/Proposal/validator/cosignature/stake,186332635,402961,4561
-Agora/Proposal/validator/voting/proposal,239645722,489368,4820
+Agora/Proposal/validator/voting/proposal,240181636,491168,5780
 Agora/Proposal/validator/voting/stake,154223940,328703,4614
 Agora/AuthorityToken/singleAuthorityTokenBurned/Correct simple,25177457,55883,806
 Agora/AuthorityToken/singleAuthorityTokenBurned/Correct many inputs,40266637,88241,900
@@ -18,6 +18,6 @@ Agora/Treasury/Validator/Positive/Allows for effect changes,37343572,79744,1841
 Agora/AuthorityToken/singleAuthorityTokenBurned/Correct simple,25177457,55883,806
 Agora/AuthorityToken/singleAuthorityTokenBurned/Correct many inputs,40266637,88241,900
 Agora/Governor/policy/GST minting,57978053,120125,1833
-Agora/Governor/validator/proposal creation,330344593,681815,8143
-Agora/Governor/validator/GATs minting,431952116,934409,8266
-Agora/Governor/validator/mutate governor state,101019422,223202,7685
+Agora/Governor/validator/proposal creation,330344593,681815,8047
+Agora/Governor/validator/GATs minting,431297108,932207,8170
+Agora/Governor/validator/mutate governor state,101019422,223202,7589