diff --git a/crates/aldabra-dao/src/builder/proposal_advance.rs b/crates/aldabra-dao/src/builder/proposal_advance.rs
index 50b865c..44faf60 100644
--- a/crates/aldabra-dao/src/builder/proposal_advance.rs
+++ b/crates/aldabra-dao/src/builder/proposal_advance.rs
@@ -68,7 +68,7 @@
 
 use pallas_codec::minicbor;
 use pallas_crypto::hash::Hash;
-use pallas_txbuilder::{BuildConway, Input, Output, StagingTransaction};
+use pallas_txbuilder::{BuildConway, Input, Output, ScriptKind, StagingTransaction};
 
 use crate::agora::proposal::{
     ProposalDatum, ProposalRedeemer, ProposalStatus, ProposalThresholds,
@@ -437,6 +437,16 @@ pub fn build_unsigned_proposal_advance(
 
     staging = staging.fee(args.fee_lovelace).network_id(network_id);
 
+    // Wire V2 cost model so pallas computes script_data_hash. Without
+    // this the chain rejects with PPViewHashesDontMatch — same trap
+    // proposal_create + plutus_mint hit. All Agora validators we
+    // witness here (proposal_validator, proposalSt policy when burning)
+    // are PlutusV2 on the preprod linker output.
+    staging = staging.language_view(
+        ScriptKind::PlutusV2,
+        aldabra_core::plutus_cost_models::PLUTUS_V2_COST_MODEL_PREPROD.to_vec(),
+    );
+
     let built = staging
         .build_conway_raw()
         .map_err(|e| DaoError::Backend(format!("build_conway_raw: {e}")))?;
diff --git a/crates/aldabra-dao/src/builder/proposal_cosign.rs b/crates/aldabra-dao/src/builder/proposal_cosign.rs
index c2e6c16..a83e031 100644
--- a/crates/aldabra-dao/src/builder/proposal_cosign.rs
+++ b/crates/aldabra-dao/src/builder/proposal_cosign.rs
@@ -53,7 +53,7 @@
 
 use pallas_codec::minicbor;
 use pallas_crypto::hash::Hash;
-use pallas_txbuilder::{BuildConway, Input, Output, StagingTransaction};
+use pallas_txbuilder::{BuildConway, Input, Output, ScriptKind, StagingTransaction};
 
 use crate::agora::proposal::{
     ProposalDatum, ProposalRedeemer, ProposalStatus, ProposalThresholds,
@@ -415,6 +415,13 @@ pub fn build_unsigned_proposal_cosign(
 
     staging = staging.fee(args.fee_lovelace).network_id(network_id);
 
+    // Wire V2 cost model — same fix as proposal_create / proposal_advance.
+    // Without this the chain rejects with PPViewHashesDontMatch.
+    staging = staging.language_view(
+        ScriptKind::PlutusV2,
+        aldabra_core::plutus_cost_models::PLUTUS_V2_COST_MODEL_PREPROD.to_vec(),
+    );
+
     let built = staging
         .build_conway_raw()
         .map_err(|e| DaoError::Backend(format!("build_conway_raw: {e}")))?;
diff --git a/crates/aldabra-dao/src/builder/proposal_vote.rs b/crates/aldabra-dao/src/builder/proposal_vote.rs
index dffd09e..739e1c9 100644
--- a/crates/aldabra-dao/src/builder/proposal_vote.rs
+++ b/crates/aldabra-dao/src/builder/proposal_vote.rs
@@ -61,7 +61,7 @@
 
 use pallas_codec::minicbor;
 use pallas_crypto::hash::Hash;
-use pallas_txbuilder::{BuildConway, Input, Output, StagingTransaction};
+use pallas_txbuilder::{BuildConway, Input, Output, ScriptKind, StagingTransaction};
 
 use crate::agora::proposal::{
     ProposalDatum, ProposalRedeemer, ProposalStatus, ProposalVotes,
@@ -499,6 +499,13 @@ pub fn build_unsigned_proposal_vote(
 
     staging = staging.fee(args.fee_lovelace).network_id(network_id);
 
+    // Wire V2 cost model — same fix as proposal_create / proposal_advance / proposal_cosign.
+    // Without this the chain rejects with PPViewHashesDontMatch.
+    staging = staging.language_view(
+        ScriptKind::PlutusV2,
+        aldabra_core::plutus_cost_models::PLUTUS_V2_COST_MODEL_PREPROD.to_vec(),
+    );
+
     let built = staging
         .build_conway_raw()
         .map_err(|e| DaoError::Backend(format!("build_conway_raw: {e}")))?;
diff --git a/crates/aldabra-dao/src/builder/stake_destroy.rs b/crates/aldabra-dao/src/builder/stake_destroy.rs
index e50d669..ef78952 100644
--- a/crates/aldabra-dao/src/builder/stake_destroy.rs
+++ b/crates/aldabra-dao/src/builder/stake_destroy.rs
@@ -32,7 +32,7 @@
 
 use pallas_codec::minicbor;
 use pallas_crypto::hash::Hash;
-use pallas_txbuilder::{BuildConway, Input, Output, StagingTransaction};
+use pallas_txbuilder::{BuildConway, Input, Output, ScriptKind, StagingTransaction};
 
 use crate::agora::stake::{Credential, StakeRedeemer};
 use crate::config::{DaoConfig, DaoNetwork};
@@ -246,6 +246,13 @@ pub fn build_unsigned_stake_destroy(
 
     staging = staging.fee(args.fee_lovelace).network_id(network_id);
 
+    // Wire V2 cost model — same fix as the proposal builders.
+    // stake_validator + stakeSt policy are PlutusV2.
+    staging = staging.language_view(
+        ScriptKind::PlutusV2,
+        aldabra_core::plutus_cost_models::PLUTUS_V2_COST_MODEL_PREPROD.to_vec(),
+    );
+
     let built = staging
         .build_conway_raw()
         .map_err(|e| DaoError::Backend(format!("build_conway_raw: {e}")))?;