diff --git a/light-client/ibc-client-starknet-types/src/client_state.rs b/light-client/ibc-client-starknet-types/src/client_state.rs
index 990f75d3..1502c0f5 100644
--- a/light-client/ibc-client-starknet-types/src/client_state.rs
+++ b/light-client/ibc-client-starknet-types/src/client_state.rs
@@ -1,5 +1,6 @@
 use cgp::prelude::*;
 use ibc_core::client::types::Height;
+use ibc_core::host::types::identifiers::ChainId;
 
 pub const STARKNET_CLIENT_STATE_TYPE_URL: &str = "/StarknetClientState";
 
@@ -7,5 +8,5 @@ pub const STARKNET_CLIENT_STATE_TYPE_URL: &str = "/StarknetClientState";
 #[derive(Clone, Debug, PartialEq, derive_more::From, HasField)]
 pub struct StarknetClientState {
     pub latest_height: Height,
-    pub chain_id: String,
+    pub chain_id: ChainId,
 }
diff --git a/light-client/ibc-client-starknet-types/src/encoding/impls/client_state.rs b/light-client/ibc-client-starknet-types/src/encoding/impls/client_state.rs
index 230c121e..2282d11d 100644
--- a/light-client/ibc-client-starknet-types/src/encoding/impls/client_state.rs
+++ b/light-client/ibc-client-starknet-types/src/encoding/impls/client_state.rs
@@ -8,7 +8,7 @@ use hermes_protobuf_encoding_components::components::{MutDecoderComponent, MutEn
 use hermes_protobuf_encoding_components::impls::encode_mut::proto_field::decode_required::DecodeRequiredProtoField;
 use hermes_protobuf_encoding_components::impls::encode_mut::proto_field::encode::EncodeLengthDelimitedProtoField;
 use ibc_core::client::types::Height;
-use starknet::core::types::Felt;
+use ibc_core::host::types::identifiers::ChainId;
 
 use crate::StarknetClientState;
 
@@ -38,11 +38,14 @@ delegate_components! {
 }
 
 impl Transformer for EncodeStarknetClientState {
-    type From = Product![Height, Felt];
+    type From = Product![Height, ChainId];
 
     type To = StarknetClientState;
 
     fn transform(product![latest_height, chain_id]: Self::From) -> Self::To {
-        StarknetClientState { latest_height, chain_id: chain_id.to_string() }
+        StarknetClientState {
+            latest_height,
+            chain_id,
+        }
     }
 }
diff --git a/light-client/ibc-client-starknet/src/client_state/execution.rs b/light-client/ibc-client-starknet/src/client_state/execution.rs
index d8b72f75..6ee83a5e 100644
--- a/light-client/ibc-client-starknet/src/client_state/execution.rs
+++ b/light-client/ibc-client-starknet/src/client_state/execution.rs
@@ -61,7 +61,7 @@ where
 
         let new_client_state = ClientStateType {
             latest_height: header.height,
-            chain_id: "dummy".to_string(), // TODO: fill with correct info
+            chain_id: "dummy".parse().unwrap(), // TODO: fill with correct info
         }
         .into();
 
diff --git a/relayer/crates/starknet-chain-components/src/impls/payload_builders/create_client.rs b/relayer/crates/starknet-chain-components/src/impls/payload_builders/create_client.rs
index 3906b9dc..e440835a 100644
--- a/relayer/crates/starknet-chain-components/src/impls/payload_builders/create_client.rs
+++ b/relayer/crates/starknet-chain-components/src/impls/payload_builders/create_client.rs
@@ -7,6 +7,7 @@ use hermes_relayer_components::chain::traits::types::create_client::{
 };
 use ibc::core::client::types::error::ClientError;
 use ibc::core::client::types::Height;
+use ibc::core::host::types::identifiers::ChainId;
 use ibc::primitives::Timestamp;
 
 use crate::types::client_state::{StarknetClientState, WasmStarknetClientState};
@@ -26,7 +27,7 @@ where
             CreateClientPayloadOptions = StarknetCreateClientPayloadOptions,
         > + HasCreateClientPayloadType<Counterparty, CreateClientPayload = StarknetCreateClientPayload>
         + CanQueryChainStatus<ChainStatus = StarknetChainStatus>
-        + HasChainId<ChainId = String>
+        + HasChainId<ChainId = ChainId>
         + CanRaiseError<ClientError>,
 {
     async fn build_create_client_payload(
@@ -41,7 +42,7 @@ where
             wasm_code_hash: create_client_options.wasm_code_hash.into(),
             client_state: StarknetClientState {
                 latest_height: Height::new(0, 1).map_err(Chain::raise_error)?,
-                chain_id: chain.chain_id().to_string(),
+                chain_id: chain.chain_id().clone(),
             },
         };
 
diff --git a/relayer/crates/starknet-chain-components/src/impls/types/chain_id.rs b/relayer/crates/starknet-chain-components/src/impls/types/chain_id.rs
index e9a4593f..8b2d890c 100644
--- a/relayer/crates/starknet-chain-components/src/impls/types/chain_id.rs
+++ b/relayer/crates/starknet-chain-components/src/impls/types/chain_id.rs
@@ -1,8 +1,9 @@
 use cgp::core::Async;
 use hermes_relayer_components::chain::traits::types::chain_id::ProvideChainIdType;
+use ibc::core::host::types::identifiers::ChainId;
 
 pub struct ProvideFeltChainId;
 
 impl<Chain: Async> ProvideChainIdType<Chain> for ProvideFeltChainId {
-    type ChainId = String;
+    type ChainId = ChainId;
 }
diff --git a/relayer/crates/starknet-chain-components/src/impls/types/client.rs b/relayer/crates/starknet-chain-components/src/impls/types/client.rs
index 25d9a0c3..385db5d0 100644
--- a/relayer/crates/starknet-chain-components/src/impls/types/client.rs
+++ b/relayer/crates/starknet-chain-components/src/impls/types/client.rs
@@ -7,6 +7,7 @@ use hermes_relayer_components::chain::traits::types::client_state::{
 };
 use hermes_relayer_components::chain::traits::types::consensus_state::ProvideConsensusStateType;
 use hermes_relayer_components::chain::traits::types::height::HasHeightType;
+use ibc::core::host::types::identifiers::ChainId;
 
 use crate::types::client_state::WasmStarknetClientState;
 use crate::types::consensus_state::WasmStarknetConsensusState;
@@ -30,7 +31,7 @@ impl<Chain, Counterparty> ClientStateFieldsGetter<Chain, Counterparty>
 where
     Chain: HasHeightType<Height = u64>
         + HasClientStateType<Counterparty, ClientState = WasmStarknetClientState>
-        + HasChainIdType<ChainId = String>,
+        + HasChainIdType<ChainId = ChainId>,
 {
     fn client_state_latest_height(client_state: &WasmStarknetClientState) -> u64 {
         client_state.client_state.latest_height.revision_height()
@@ -45,6 +46,6 @@ where
     }
 
     fn client_state_chain_id(client_state: &WasmStarknetClientState) -> Chain::ChainId {
-        client_state.client_state.chain_id.to_string()
+        client_state.client_state.chain_id.clone()
     }
 }
diff --git a/relayer/crates/starknet-chain-context/src/contexts/chain.rs b/relayer/crates/starknet-chain-context/src/contexts/chain.rs
index cca42b9e..c2b39420 100644
--- a/relayer/crates/starknet-chain-context/src/contexts/chain.rs
+++ b/relayer/crates/starknet-chain-context/src/contexts/chain.rs
@@ -6,6 +6,7 @@ use cgp::core::field::impls::use_field::WithField;
 use cgp::core::types::impls::WithType;
 use cgp::prelude::*;
 use hermes_cairo_encoding_components::types::as_felt::AsFelt;
+use hermes_chain_type_components::traits::types::chain_id::HasChainIdType;
 use hermes_chain_type_components::traits::types::commitment_proof::HasCommitmentProofType;
 use hermes_chain_type_components::traits::types::height::HasHeightType;
 use hermes_chain_type_components::traits::types::message_response::HasMessageResponseType;
@@ -153,7 +154,7 @@ use hermes_test_components::chain::traits::queries::balance::CanQueryBalance;
 use hermes_test_components::chain::traits::types::address::HasAddressType;
 use hermes_test_components::chain::traits::types::wallet::WalletTypeComponent;
 use ibc::core::channel::types::packet::Packet;
-use ibc::core::host::types::identifiers::{PortId as IbcPortId, Sequence};
+use ibc::core::host::types::identifiers::{ChainId, PortId as IbcPortId, Sequence};
 use starknet::accounts::SingleOwnerAccount;
 use starknet::core::types::Felt;
 use starknet::providers::jsonrpc::HttpTransport;
@@ -167,7 +168,7 @@ use crate::impls::error::HandleStarknetChainError;
 #[derive(HasField, Clone)]
 pub struct StarknetChain {
     pub runtime: HermesRuntime,
-    pub chain_id: String,
+    pub chain_id: ChainId,
     pub rpc_client: Arc<JsonRpcClient<HttpTransport>>,
     pub account: SingleOwnerAccount<Arc<JsonRpcClient<HttpTransport>>, LocalWallet>,
     pub ibc_client_contract_address: Option<Felt>,
@@ -248,7 +249,7 @@ impl JsonRpcClientGetter<StarknetChain> for StarknetChainContextComponents {
 }
 
 impl ChainIdGetter<StarknetChain> for StarknetChainContextComponents {
-    fn chain_id(chain: &StarknetChain) -> &String {
+    fn chain_id(chain: &StarknetChain) -> &ChainId {
         &chain.chain_id
     }
 }
@@ -263,6 +264,7 @@ pub trait CanUseStarknetChain:
     + HasDefaultEncoding<AsFelt, Encoding = StarknetCairoEncoding>
     + HasCommitmentProofType<CommitmentProof = StarknetCommitmentProof>
     + HasAddressType<Address = Felt>
+    + HasChainIdType<ChainId = ChainId>
     + HasSelectorType<Selector = Felt>
     + HasBlobType<Blob = Vec<Felt>>
     + HasCommitmentPrefixType<CommitmentPrefix = Vec<u8>>
@@ -371,6 +373,7 @@ pub trait CanUseCosmosChainWithStarknet: HasClientStateType<StarknetChain, Clien
     + HasConsensusStateType<StarknetChain, ConsensusState = CometConsensusState>
     + HasUpdateClientPayloadType<StarknetChain, UpdateClientPayload = CometUpdateHeader>
     + HasInitConnectionOptionsType<StarknetChain, InitConnectionOptions = CosmosInitConnectionOptions>
+    + HasChainIdType<ChainId = ChainId>
     + HasCounterpartyMessageHeight<StarknetChain>
     + HasClientStateFields<StarknetChain>
     + CanQueryClientState<StarknetChain>
diff --git a/relayer/crates/starknet-cli/src/contexts/app.rs b/relayer/crates/starknet-cli/src/contexts/app.rs
index a6f9c088..e4397d0f 100644
--- a/relayer/crates/starknet-cli/src/contexts/app.rs
+++ b/relayer/crates/starknet-cli/src/contexts/app.rs
@@ -64,7 +64,7 @@ use hermes_starknet_integration_tests::contexts::chain_driver::StarknetChainDriv
 use hermes_starknet_relayer::contexts::builder::StarknetBuilder;
 use hermes_test_components::chain_driver::traits::config::ConfigUpdater;
 use ibc::core::client::types::Height;
-use ibc::core::host::types::identifiers::ClientId as CosmosClientId;
+use ibc::core::host::types::identifiers::{ChainId, ClientId as CosmosClientId};
 use starknet::core::types::Felt;
 use toml::to_string_pretty;
 
@@ -137,7 +137,7 @@ delegate_components! {
 
 delegate_components! {
     StarknetParserComponents {
-        (QueryClientStateArgs, symbol!("chain_id")): ParseFromString<String>,
+        (QueryClientStateArgs, symbol!("chain_id")): ParseFromString<ChainId>,
         (QueryClientStateArgs, symbol!("client_id")): ParseFromString<ClientId>,
         (QueryClientStateArgs, symbol!("height")): ParseFromOptionalString<u64>,
 
@@ -146,13 +146,13 @@ delegate_components! {
         (QueryConsensusStateArgs, symbol!("query_height")): ParseFromOptionalString<u64>,
         (QueryConsensusStateArgs, symbol!("consensus_height")): ParseFromOptionalString<Height>,
 
-        (QueryChainStatusArgs, symbol!("chain_id")): ParseFromString<String>,
+        (QueryChainStatusArgs, symbol!("chain_id")): ParseFromString<ChainId>,
 
-        (QueryBalanceArgs, symbol!("chain_id")): ParseFromString<String>,
+        (QueryBalanceArgs, symbol!("chain_id")): ParseFromString<ChainId>,
         (QueryBalanceArgs, symbol!("address")): ParseFromString<Felt>,
         (QueryBalanceArgs, symbol!("denom")): ParseFromString<Felt>,
 
-        (UpdateClientArgs, symbol!("host_chain_id")): ParseFromString<String>,
+        (UpdateClientArgs, symbol!("host_chain_id")): ParseFromString<ChainId>,
         (UpdateClientArgs, symbol!("client_id")): ParseFromString<ClientId>,
         (UpdateClientArgs, symbol!("counterparty_client_id")): ParseFromString<CosmosClientId>,
         (UpdateClientArgs, symbol!("target_height")): ParseFromOptionalString<Height>,
diff --git a/relayer/crates/starknet-integration-tests/src/contexts/bootstrap.rs b/relayer/crates/starknet-integration-tests/src/contexts/bootstrap.rs
index a32efeeb..9873998d 100644
--- a/relayer/crates/starknet-integration-tests/src/contexts/bootstrap.rs
+++ b/relayer/crates/starknet-integration-tests/src/contexts/bootstrap.rs
@@ -138,7 +138,7 @@ impl ChainDriverBuilder<StarknetBootstrap> for StarknetBootstrapComponents {
 
         let chain = StarknetChain {
             runtime: runtime.clone(),
-            chain_id: chain_id.to_string(),
+            chain_id: chain_id.to_string().parse().unwrap(),
             rpc_client,
             account,
             ibc_client_contract_address: None,
diff --git a/relayer/crates/starknet-relayer/src/build/components/relay/build.rs b/relayer/crates/starknet-relayer/src/build/components/relay/build.rs
index 9c761492..2e02cc33 100644
--- a/relayer/crates/starknet-relayer/src/build/components/relay/build.rs
+++ b/relayer/crates/starknet-relayer/src/build/components/relay/build.rs
@@ -13,7 +13,7 @@ impl RelayBuilder<StarknetBuilder, Index<0>, Index<1>> for StarknetBuildComponen
     async fn build_relay(
         build: &StarknetBuilder,
         _index: PhantomData<(Index<0>, Index<1>)>,
-        _src_chain_id: &String,
+        _src_chain_id: &ChainId,
         dst_chain_id: &ChainId,
         src_client_id: &StarknetClientId,
         dst_client_id: &CosmosClientId,
diff --git a/relayer/crates/starknet-relayer/src/contexts/builder.rs b/relayer/crates/starknet-relayer/src/contexts/builder.rs
index 904621fb..75ba261c 100644
--- a/relayer/crates/starknet-relayer/src/contexts/builder.rs
+++ b/relayer/crates/starknet-relayer/src/contexts/builder.rs
@@ -88,7 +88,7 @@ impl ChainBuilder<StarknetBuilder, Index<0>> for StarknetBuildComponents {
     async fn build_chain(
         build: &StarknetBuilder,
         _index: PhantomData<Index<0>>,
-        _chain_id: &String,
+        _chain_id: &ChainId,
     ) -> Result<StarknetChain, HermesError> {
         build.build_chain().await
     }