diff --git a/crates/aldabra-dao/src/builder/proposal_create.rs b/crates/aldabra-dao/src/builder/proposal_create.rs
index 18ccc62..3a5ebe0 100644
--- a/crates/aldabra-dao/src/builder/proposal_create.rs
+++ b/crates/aldabra-dao/src/builder/proposal_create.rs
@@ -43,7 +43,7 @@ use pallas_codec::minicbor;
 use pallas_codec::utils::KeyValuePairs;
 use pallas_crypto::hash::Hash;
 use pallas_primitives::PlutusData;
-use pallas_txbuilder::{BuildConway, ExUnits, Input, Output, StagingTransaction};
+use pallas_txbuilder::{BuildConway, ExUnits, Input, Output, ScriptKind, StagingTransaction};
 
 use crate::agora::governor::GovernorDatum;
 use crate::agora::proposal::{
@@ -589,6 +589,17 @@ pub fn build_unsigned_proposal_create(
 
     staging = staging.fee(args.fee_lovelace).network_id(network_id);
 
+    // Wire the V2 cost model so pallas computes script_data_hash. Without
+    // this the chain rejects with PPViewHashesDontMatch — same trap the
+    // plutus_mint path tripped over on 2026-05-07. All Agora validators
+    // we witness here (governor, stake, proposalSt policy) are PlutusV2
+    // on the current preprod linker output, so a single language_view
+    // entry covers all three.
+    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}")))?;