diff --git a/eth2near/contract_wrapper/src/eth_client_contract.rs b/eth2near/contract_wrapper/src/eth_client_contract.rs
index 28156ba5c..b5c5e639d 100644
--- a/eth2near/contract_wrapper/src/eth_client_contract.rs
+++ b/eth2near/contract_wrapper/src/eth_client_contract.rs
@@ -52,8 +52,8 @@ impl EthClientContract {
         finalized_beacon_header: ExtendedBeaconBlockHeader,
         current_sync_committee: SyncCommittee,
         next_sync_committee: SyncCommittee,
-        validate_updates: bool,
-        verify_bls_signatures: bool,
+        validate_updates: Option<bool>,
+        verify_bls_signatures: Option<bool>,
         hashes_gc_threshold: Option<u64>,
         max_submitted_blocks_by_account: Option<u32>,
         trusted_signer: Option<AccountId>,
@@ -78,8 +78,8 @@ impl EthClientContract {
             finalized_beacon_header,
             current_sync_committee,
             next_sync_committee,
-            validate_updates,
-            verify_bls_signatures,
+            validate_updates: validate_updates.unwrap_or(true),
+            verify_bls_signatures: verify_bls_signatures.unwrap_or(false),
             hashes_gc_threshold: hashes_gc_threshold.unwrap_or(51_000),
             max_submitted_blocks_by_account: max_submitted_blocks_by_account.unwrap_or(8000),
             trusted_signer,
diff --git a/eth2near/eth2-contract-init/Cargo.lock b/eth2near/eth2-contract-init/Cargo.lock
index 210cc244a..48dd473eb 100644
--- a/eth2near/eth2-contract-init/Cargo.lock
+++ b/eth2near/eth2-contract-init/Cargo.lock
@@ -1257,6 +1257,7 @@ dependencies = [
  "near-jsonrpc-primitives",
  "near-primitives 0.14.0",
  "near-sdk",
+ "primitive-types 0.7.3",
  "prometheus",
  "reqwest",
  "serde",
diff --git a/eth2near/eth2-contract-init/src/config.rs b/eth2near/eth2-contract-init/src/config.rs
index f7963a68d..6f8fc829e 100644
--- a/eth2near/eth2-contract-init/src/config.rs
+++ b/eth2near/eth2-contract-init/src/config.rs
@@ -36,15 +36,15 @@ pub struct Config {
     pub output_dir: Option<String>,
 
     // Timeout for ETH RPC requests in seconds
-    pub eth_requests_timeout_seconds: u64,
+    pub eth_requests_timeout_seconds: Option<u64>,
 
-    pub validate_updates: bool,
+    pub validate_updates: Option<bool>,
 
-    pub verify_bls_signature: bool,
+    pub verify_bls_signature: Option<bool>,
 
-    pub hashes_gc_threshold: u64,
+    pub hashes_gc_threshold: Option<u64>,
 
-    pub max_submitted_blocks_by_account: u32,
+    pub max_submitted_blocks_by_account: Option<u32>,
 
     pub trusted_signature: Option<String>,
 
diff --git a/eth2near/eth2-contract-init/src/init_contract.rs b/eth2near/eth2-contract-init/src/init_contract.rs
index 5cb9c5016..18c46d752 100644
--- a/eth2near/eth2-contract-init/src/init_contract.rs
+++ b/eth2near/eth2-contract-init/src/init_contract.rs
@@ -47,14 +47,14 @@ pub fn init_contract(
     info!(target: "relay", "=== Contract initialization ===");
 
     if let NearNetwork::Mainnet = config.near_network_id {
-        assert!(config.validate_updates, "The updates validation can't be disabled for mainnet");
-        assert!(config.verify_bls_signature || config.trusted_signature.is_some(), "The client can't be executed in the trustless mode without BLS sigs verification on Mainnet");
+        assert!(config.validate_updates.unwrap_or(true), "The updates validation can't be disabled for mainnet");
+        assert!(config.verify_bls_signature.unwrap_or(false) || config.trusted_signature.is_some(), "The client can't be executed in the trustless mode without BLS sigs verification on Mainnet");
     }
 
     let beacon_rpc_client = BeaconRPCClient::new(
         &config.beacon_endpoint,
-        config.eth_requests_timeout_seconds,
-        config.eth_requests_timeout_seconds,
+        config.eth_requests_timeout_seconds.unwrap_or(10),
+        config.eth_requests_timeout_seconds.unwrap_or(10),
     );
     let eth1_rpc_client = Eth1RPCClient::new(&config.eth1_endpoint);
 
@@ -126,8 +126,8 @@ pub fn init_contract(
         next_sync_committee,
         config.validate_updates,
         config.verify_bls_signature,
-        Some(config.hashes_gc_threshold),
-        Some(config.max_submitted_blocks_by_account),
+        config.hashes_gc_threshold,
+        config.max_submitted_blocks_by_account,
         trusted_signature,
     );
 
@@ -169,11 +169,11 @@ mod tests {
             ethereum_network: config_for_test.network_name.clone(),
             near_network_id: NearNetwork::Testnet,
             output_dir: None,
-            eth_requests_timeout_seconds: 30,
-            validate_updates: true,
-            verify_bls_signature: false,
-            hashes_gc_threshold: 51000,
-            max_submitted_blocks_by_account: 8000,
+            eth_requests_timeout_seconds: Some(30),
+            validate_updates: Some(true),
+            verify_bls_signature: Some(false),
+            hashes_gc_threshold: Some(51000),
+            max_submitted_blocks_by_account: Some(8000),
             trusted_signature: Some(eth_client_contract.get_signer_account_id().to_string()),
             init_block_root: None,
         }
@@ -189,7 +189,7 @@ mod tests {
 
         let mut eth_client_contract = EthClientContract::new(contract_wrapper);
         let mut init_config = get_init_config(&config_for_test, &eth_client_contract);
-        init_config.validate_updates = false;
+        init_config.validate_updates = Some(false);
         init_config.near_network_id = NearNetwork::Mainnet;
 
         init_contract(&init_config, &mut eth_client_contract).unwrap();
diff --git a/eth2near/eth2near-block-relay-rs/src/test_utils.rs b/eth2near/eth2near-block-relay-rs/src/test_utils.rs
index 2abd42608..ef0275735 100644
--- a/eth2near/eth2near-block-relay-rs/src/test_utils.rs
+++ b/eth2near/eth2near-block-relay-rs/src/test_utils.rs
@@ -79,8 +79,8 @@ pub fn init_contract_from_files(
         finalized_beacon_header,
         current_sync_committee,
         next_sync_committee,
-        true,
-        false,
+        Some(true),
+        Some(false),
         None,
         None,
         Some(eth_client_contract.contract_wrapper.get_signer_account_id()),
@@ -155,8 +155,8 @@ pub fn init_contract_from_specific_slot(
         finalized_beacon_header,
         current_sync_committee,
         next_sync_committee,
-        true,
-        false,
+        Some(true),
+        Some(false),
         None,
         None,
         Some(eth_client_contract.contract_wrapper.get_signer_account_id()),
@@ -220,11 +220,11 @@ fn get_init_config(
         ethereum_network: config_for_test.network_name.clone(),
         near_network_id: NearNetwork::Testnet,
         output_dir: None,
-        eth_requests_timeout_seconds: 30,
-        validate_updates: true,
-        verify_bls_signature: false,
-        hashes_gc_threshold: 51000,
-        max_submitted_blocks_by_account: 8000,
+        eth_requests_timeout_seconds: Some(30),
+        validate_updates: Some(true),
+        verify_bls_signature: Some(false),
+        hashes_gc_threshold: Some(51000),
+        max_submitted_blocks_by_account: Some(8000),
         trusted_signature: Some(eth_client_contract.get_signer_account_id().to_string()),
         init_block_root: None,
     }