diff --git a/prover/src/circuit_witness.rs b/prover/src/circuit_witness.rs
index ed4dafde..fc702bad 100644
--- a/prover/src/circuit_witness.rs
+++ b/prover/src/circuit_witness.rs
@@ -9,9 +9,10 @@ use eth_types::ToBigEndian;
 use eth_types::Word;
 use eth_types::H256;
 use eth_types::{geth_types, Bytes};
-use ethers_providers::Http;
+// use ethers_providers::Http;
+use ethers_providers::Ws;
 use halo2_proofs::halo2curves::bn256::Fr;
-use std::str::FromStr;
+// use std::str::FromStr;
 use zkevm_circuits::evm_circuit;
 use zkevm_circuits::pi_circuit::PublicData;
 use zkevm_common::prover::CircuitConfig;
@@ -72,14 +73,14 @@ impl CircuitWitness {
         propose_tx_hash: &str,
         l2_rpc_url: &str,
     ) -> Result<Self, Box<dyn std::error::Error>> {
-        let l1_url = Http::from_str(l1_rpc_url)?;
+        let l1_url = Ws::connect(l1_rpc_url).await?;
         let l1_geth_client = GethClient::new(l1_url);
         let propose_tx_hash = eth_types::H256::from_slice(
             &hex::decode(propose_tx_hash).expect("parse propose tx hash"),
         );
         let txs_rlp = get_txs_rlp(&l1_geth_client, propose_tx_hash).await?;
 
-        let l2_url = Http::from_str(l2_rpc_url)?;
+        let l2_url = Ws::connect(l2_rpc_url).await?;
         let l2_geth_client = GethClient::new(l2_url);
         // TODO: add support for `eth_getHeaderByNumber`
         let block = l2_geth_client
diff --git a/prover/src/shared_state.rs b/prover/src/shared_state.rs
index fb0594c4..e77803a2 100644
--- a/prover/src/shared_state.rs
+++ b/prover/src/shared_state.rs
@@ -5,7 +5,7 @@ use crate::circuit_witness::CircuitWitness;
 use crate::circuits::*;
 use crate::utils::collect_instance;
 use crate::utils::fixed_rng;
-use crate::utils::gen_num_instance;
+// use crate::utils::gen_num_instance;
 use crate::utils::gen_proof;
 use crate::G1Affine;
 use crate::ProverKey;
@@ -17,10 +17,10 @@ use halo2_proofs::plonk::{keygen_pk, keygen_vk};
 use halo2_proofs::poly::commitment::Params;
 use hyper::Uri;
 use rand::{thread_rng, Rng};
-use snark_verifier::loader::native::NativeLoader;
-use snark_verifier::system::halo2::compile;
+// use snark_verifier::loader::native::NativeLoader;
+// use snark_verifier::system::halo2::compile;
 use snark_verifier::system::halo2::transcript::evm::EvmTranscript;
-use snark_verifier::system::halo2::Config as PlonkConfig;
+// use snark_verifier::system::halo2::Config as PlonkConfig;
 use std::collections::HashMap;
 use std::fmt::Write;
 use std::fs::File;