diff --git a/crates/core/src/provider/evm_provider.rs b/crates/core/src/provider/evm_provider.rs
index 7036f38c..cbbbea76 100644
--- a/crates/core/src/provider/evm_provider.rs
+++ b/crates/core/src/provider/evm_provider.rs
@@ -438,6 +438,9 @@ impl EvmProvider {
         let mut request: TransactionRequest = transaction.clone().into();
         // need from here else it will fail gas estimating
         request.from = Some(from.into_address());
+        // Omit the gas limit so the node uses the block gas limit as the estimation
+        // ceiling. Passing a fixed cap risks failing the estimate for heavy transactions.
+        request.gas = None;
 
         let request_with_other = WithOtherFields::new(request);
 
diff --git a/crates/core/src/transaction/queue_system/transactions_queue.rs b/crates/core/src/transaction/queue_system/transactions_queue.rs
index f1ccee2a..c931cb2c 100644
--- a/crates/core/src/transaction/queue_system/transactions_queue.rs
+++ b/crates/core/src/transaction/queue_system/transactions_queue.rs
@@ -1171,8 +1171,9 @@ impl TransactionsQueue {
             working_transaction.value = TransactionValue::zero();
         }
 
-        // Estimate gas limit by creating a temporary transaction with a high gas limit to avoid failing the estimate
-        let temp_gas_limit = GasLimit::new(10_000_000);
+        // Build a temporary transaction for gas estimation. The gas limit here is a
+        // placeholder only — `estimate_gas` omits it so the node uses the block gas limit.
+        let temp_gas_limit = GasLimit::new(0);
 
         let temp_transaction_request = if working_transaction.is_blob_transaction() {
             info!(
diff --git a/crates/core/src/transaction/queue_system/transactions_queues.rs b/crates/core/src/transaction/queue_system/transactions_queues.rs
index cdbdbcdb..9c9f9281 100644
--- a/crates/core/src/transaction/queue_system/transactions_queues.rs
+++ b/crates/core/src/transaction/queue_system/transactions_queues.rs
@@ -523,9 +523,9 @@ impl TransactionsQueues {
         gas_price: &GasPriceResult,
         blob_gas_price: Option<&BlobGasPriceResult>,
     ) -> Result<GasLimit, AddTransactionError> {
-        // Use a reasonable temporary limit for gas estimation
-        const TEMP_GAS_LIMIT: u128 = 1_000_000;
-        let temp_gas_limit = GasLimit::new(TEMP_GAS_LIMIT);
+        // Build a temporary transaction for gas estimation. The gas limit here is a
+        // placeholder only — `estimate_gas` omits it so the node uses the block gas limit.
+        let temp_gas_limit = GasLimit::new(0);
 
         let current_onchain_nonce = transactions_queue.get_nonce().await.map_err(|e| {
             AddTransactionError::CouldNotGetCurrentOnChainNonce(transaction.relayer_id, e)