diff --git a/Cargo.lock b/Cargo.lock
index 2d92a51..d0494e4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4425,6 +4425,7 @@ dependencies = [
  "contract-interface",
  "ethereum-types 0.14.1",
  "ethers",
+ "hex",
  "lazy_static",
  "network",
  "rand 0.8.5",
diff --git a/node/miner/Cargo.toml b/node/miner/Cargo.toml
index 58d9e3a..3fafda9 100644
--- a/node/miner/Cargo.toml
+++ b/node/miner/Cargo.toml
@@ -20,3 +20,4 @@ ethers = "^2"
 lazy_static = "1.4"
 async-trait = "0.1.56"
 shared_types = { path = "../shared_types" }
+hex = "0.4"
\ No newline at end of file
diff --git a/node/miner/src/config.rs b/node/miner/src/config.rs
index 8531c4f..01078d0 100644
--- a/node/miner/src/config.rs
+++ b/node/miner/src/config.rs
@@ -1,4 +1,4 @@
-use ethereum_types::{Address, H256};
+use ethereum_types::{Address, H256, U256};
 use ethers::core::k256::SecretKey;
 use ethers::middleware::SignerMiddleware;
 use ethers::providers::Http;
@@ -13,6 +13,7 @@ pub struct MinerConfig {
     pub(crate) rpc_endpoint_url: String,
     pub(crate) mine_address: Address,
     pub(crate) flow_address: Address,
+    pub(crate) submission_gas: Option<U256>,
 }
 
 pub type MineServiceMiddleware = SignerMiddleware<Provider<Http>, LocalWallet>;
@@ -24,6 +25,7 @@ impl MinerConfig {
         rpc_endpoint_url: String,
         mine_address: Address,
         flow_address: Address,
+        submission_gas: Option<U256>,
     ) -> Option<MinerConfig> {
         match (miner_id, miner_key) {
             (Some(miner_id), Some(miner_key)) => Some(MinerConfig {
@@ -32,6 +34,7 @@ impl MinerConfig {
                 rpc_endpoint_url,
                 mine_address,
                 flow_address,
+                submission_gas,
             }),
             _ => None,
         }
diff --git a/node/miner/src/submitter.rs b/node/miner/src/submitter.rs
index d01d287..bd5ec03 100644
--- a/node/miner/src/submitter.rs
+++ b/node/miner/src/submitter.rs
@@ -1,6 +1,9 @@
 use contract_interface::PoraAnswer;
 use contract_interface::{PoraMine, ZgsFlow};
+use ethereum_types::U256;
+use ethers::contract::ContractCall;
 use ethers::providers::PendingTransaction;
+use hex::ToHex;
 use shared_types::FlowRangeProof;
 use std::sync::Arc;
 use storage::log_store::Store;
@@ -18,6 +21,7 @@ pub struct Submitter {
     mine_answer_receiver: mpsc::UnboundedReceiver<AnswerWithoutProof>,
     mine_contract: PoraMine<MineServiceMiddleware>,
     flow_contract: ZgsFlow<MineServiceMiddleware>,
+    default_gas_limit: Option<U256>,
     store: Arc<RwLock<dyn Store>>,
 }
 
@@ -31,12 +35,14 @@ impl Submitter {
     ) {
         let mine_contract = PoraMine::new(config.mine_address, provider.clone());
         let flow_contract = ZgsFlow::new(config.flow_address, provider);
+        let default_gas_limit = config.submission_gas;
 
         let submitter = Submitter {
             mine_answer_receiver,
             mine_contract,
             flow_contract,
             store,
+            default_gas_limit,
         };
         executor.spawn(
             async move { Box::pin(submitter.start()).await },
@@ -97,12 +103,35 @@ impl Submitter {
         };
         trace!("submit_answer: answer={:?}", answer);
 
-        let submission_call = self.mine_contract.submit(answer).legacy();
+        let mut submission_call: ContractCall<_, _> = self.mine_contract.submit(answer).legacy();
+
+        if let Some(gas_limit) = self.default_gas_limit {
+            submission_call = submission_call.gas(gas_limit);
+        }
+
+        if let Some(calldata) = submission_call.calldata() {
+            debug!(
+                "Submission transaction calldata: {}",
+                calldata.encode_hex::<String>()
+            );
+        }
+
+        debug!("Local construct tx: {:?}", &submission_call.tx);
+        debug!(
+            "Estimate gas result: {:?}",
+            submission_call.estimate_gas().await
+        );
+
         let pending_transaction: PendingTransaction<'_, _> = submission_call
             .send()
             .await
             .map_err(|e| format!("Fail to send mine answer transaction: {:?}", e))?;
 
+        debug!(
+            "Signed submission transaction hash: {:?}",
+            pending_transaction.tx_hash()
+        );
+
         let receipt = pending_transaction
             .retries(SUBMISSION_RETIES)
             .await
diff --git a/node/src/config/convert.rs b/node/src/config/convert.rs
index 2f3a6ce..6720436 100644
--- a/node/src/config/convert.rs
+++ b/node/src/config/convert.rs
@@ -1,7 +1,7 @@
 #![allow(clippy::field_reassign_with_default)]
 
 use crate::ZgsConfig;
-use ethereum_types::H256;
+use ethereum_types::{H256, U256};
 use log_entry_sync::{CacheConfig, ContractAddress, LogSyncConfig};
 use miner::MinerConfig;
 use network::NetworkConfig;
@@ -139,12 +139,14 @@ impl ZgsConfig {
         } else {
             None
         };
+        let submission_gas = self.miner_submission_gas.map(U256::from);
         Ok(MinerConfig::new(
             miner_id,
             miner_key,
             self.blockchain_rpc_endpoint.clone(),
             mine_address,
             flow_address,
+            submission_gas,
         ))
     }
 
diff --git a/node/src/config/mod.rs b/node/src/config/mod.rs
index 74f5c0f..6400294 100644
--- a/node/src/config/mod.rs
+++ b/node/src/config/mod.rs
@@ -63,6 +63,7 @@ build_config! {
     (mine_contract_address, (String), "".to_string())
     (miner_id, (Option<String>), None)
     (miner_key, (Option<String>), None)
+    (miner_submission_gas, (Option<u64>), None)
 }
 
 #[derive(Debug, Default, Deserialize)]