diff --git a/rust/tw_cosmos_sdk/src/modules/serializer/json_serializer.rs b/rust/tw_cosmos_sdk/src/modules/serializer/json_serializer.rs
index 0b2c81195ad..1bf3dff3649 100644
--- a/rust/tw_cosmos_sdk/src/modules/serializer/json_serializer.rs
+++ b/rust/tw_cosmos_sdk/src/modules/serializer/json_serializer.rs
@@ -18,6 +18,9 @@ pub struct SignedTxJson {
     pub memo: String,
     pub msg: Vec<AnyMsg<Json>>,
     pub signatures: Vec<SignatureJson>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(default)]
+    pub timeout_height: Option<String>,
 }
 
 #[derive(Serialize)]
@@ -28,6 +31,9 @@ pub struct UnsignedTxJson {
     pub memo: String,
     pub msgs: Vec<AnyMsg<Json>>,
     pub sequence: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(default)]
+    pub timeout_height: Option<String>,
 }
 
 #[derive(Serialize)]
@@ -69,11 +75,19 @@ where
         let signature =
             Self::serialize_signature(&signed.signer.public_key, signed.signature.clone());
 
+        let convert = |value: u64| {
+            if value == 0 {
+                None
+            } else {
+                Some(value.to_string())
+            }
+        };
         Ok(SignedTxJson {
             fee: Self::build_fee(&signed.fee),
             memo: signed.tx_body.memo.clone(),
             msg,
             signatures: vec![signature],
+            timeout_height: convert(signed.tx_body.timeout_height),
         })
     }
 
@@ -87,6 +101,13 @@ where
             .map(|msg| msg.to_json())
             .collect::<SigningResult<_>>()?;
 
+        let convert = |value: u64| {
+            if value == 0 {
+                None
+            } else {
+                Some(value.to_string())
+            }
+        };
         Ok(UnsignedTxJson {
             account_number: unsigned.account_number.to_string(),
             chain_id: unsigned.chain_id.clone(),
@@ -94,6 +115,7 @@ where
             memo: unsigned.tx_body.memo.clone(),
             msgs,
             sequence: unsigned.signer.sequence.to_string(),
+            timeout_height: convert(unsigned.tx_body.timeout_height),
         })
     }
 
diff --git a/rust/tw_cosmos_sdk/src/modules/tx_builder.rs b/rust/tw_cosmos_sdk/src/modules/tx_builder.rs
index c39d13f8c70..8bd97cafbb1 100644
--- a/rust/tw_cosmos_sdk/src/modules/tx_builder.rs
+++ b/rust/tw_cosmos_sdk/src/modules/tx_builder.rs
@@ -20,8 +20,6 @@ use tw_number::U256;
 use tw_proto::Cosmos::Proto;
 use tw_proto::{google, serialize};
 
-const DEFAULT_TIMEOUT_HEIGHT: u64 = 0;
-
 pub struct TxBuilder<Context> {
     _phantom: PhantomData<Context>,
 }
@@ -126,7 +124,7 @@ where
         Ok(TxBody {
             messages,
             memo: input.memo.to_string(),
-            timeout_height: DEFAULT_TIMEOUT_HEIGHT,
+            timeout_height: input.timeout_height,
         })
     }
 
diff --git a/rust/tw_cosmos_sdk/tests/sign.rs b/rust/tw_cosmos_sdk/tests/sign.rs
index 37436b4947f..8b703393ff3 100644
--- a/rust/tw_cosmos_sdk/tests/sign.rs
+++ b/rust/tw_cosmos_sdk/tests/sign.rs
@@ -135,6 +135,70 @@ fn test_sign_raw_json() {
     });
 }
 
+#[test]
+fn test_sign_raw_json_with_timeout() {
+    let coin = TestCoinContext::default()
+        .with_public_key_type(PublicKeyType::Secp256k1)
+        .with_hrp("cosmos");
+
+    let raw_json_msg = Proto::mod_Message::RawJSON {
+        type_pb: "osmosis/poolmanager/split-amount-in".into(),
+        value: r#"{
+        "routes": [
+          {
+            "pools": [
+              {
+                "pool_id": "463",
+                "token_out_denom": "ibc/1DC495FCEFDA068A3820F903EDBD78B942FBD204D7E93D3BA2B432E9669D1A59"
+              },
+              {
+                "pool_id": "916",
+                "token_out_denom": "ibc/573FCD90FACEE750F55A8864EF7D38265F07E5A9273FA0E8DAFD39951332B580"
+              }
+            ],
+            "token_in_amount": "70000"
+          },
+          {
+            "pools": [
+              {
+                "pool_id": "907",
+                "token_out_denom": "ibc/573FCD90FACEE750F55A8864EF7D38265F07E5A9273FA0E8DAFD39951332B580"
+              }
+            ],
+            "token_in_amount": "30000"
+          }
+        ],
+        "sender": "osmo1qr7dhmvcqm4fnleaqel3gel4u20nk5rp9rwsae",
+        "token_in_denom": "uosmo",
+        "token_out_min_amount": "885297"
+    }"#.into(),
+    };
+    let input = Proto::SigningInput {
+        account_number: 24139,
+        chain_id: "osmosis-1".into(),
+        sequence: 191,
+        fee: Some(make_fee(617438, make_amount("uosmo", "1853"))),
+        private_key: account_1037_private_key(),
+        messages: vec![make_message(MessageEnum::raw_json_message(raw_json_msg))],
+        timeout_height: 13692007,
+        ..Proto::SigningInput::default()
+    };
+
+    // `RawJSON` doesn't support Protobuf serialization and signing.
+    test_sign_protobuf_error::<StandardCosmosContext>(TestErrorInput {
+        coin: &coin,
+        input: input.clone(),
+        error: SigningError::Error_not_supported,
+    });
+    test_sign_json::<StandardCosmosContext>(TestInput {
+        coin: &coin,
+        input,
+        tx: r#"{"mode":"block","tx":{"fee":{"amount":[{"amount":"1853","denom":"uosmo"}],"gas":"617438"},"memo":"","msg":[{"type":"osmosis/poolmanager/split-amount-in","value":{"routes":[{"pools":[{"pool_id":"463","token_out_denom":"ibc/1DC495FCEFDA068A3820F903EDBD78B942FBD204D7E93D3BA2B432E9669D1A59"},{"pool_id":"916","token_out_denom":"ibc/573FCD90FACEE750F55A8864EF7D38265F07E5A9273FA0E8DAFD39951332B580"}],"token_in_amount":"70000"},{"pools":[{"pool_id":"907","token_out_denom":"ibc/573FCD90FACEE750F55A8864EF7D38265F07E5A9273FA0E8DAFD39951332B580"}],"token_in_amount":"30000"}],"sender":"osmo1qr7dhmvcqm4fnleaqel3gel4u20nk5rp9rwsae","token_in_denom":"uosmo","token_out_min_amount":"885297"}}],"signatures":[{"pub_key":{"type":"tendermint/PubKeySecp256k1","value":"AlcobsPzfTNVe7uqAAsndErJAjqplnyudaGB0f+R+p3F"},"signature":"7gMxXwqzZDe5+h1i16q7A7CgGUtLl2+Q8/YaUZCeYvp8kISbBwD2SlNTpJtz1RLskzF2uNcDebo61HbcVn9dAw=="}],"timeout_height":"13692007"}}"#,
+        signature: "ee03315f0ab36437b9fa1d62d7aabb03b0a0194b4b976f90f3f61a51909e62fa7c90849b0700f64a5353a49b73d512ec933176b8d70379ba3ad476dc567f5d03",
+        signature_json: r#"[{"pub_key":{"type":"tendermint/PubKeySecp256k1","value":"AlcobsPzfTNVe7uqAAsndErJAjqplnyudaGB0f+R+p3F"},"signature":"7gMxXwqzZDe5+h1i16q7A7CgGUtLl2+Q8/YaUZCeYvp8kISbBwD2SlNTpJtz1RLskzF2uNcDebo61HbcVn9dAw=="}]"#,
+    });
+}
+
 #[test]
 fn test_sign_ibc_transfer() {
     let coin = TestCoinContext::default()
diff --git a/src/proto/Cosmos.proto b/src/proto/Cosmos.proto
index 6ac55b56570..04384442e93 100644
--- a/src/proto/Cosmos.proto
+++ b/src/proto/Cosmos.proto
@@ -425,6 +425,9 @@ message SigningInput {
 
     // Optional. If set, use a different Signer info when signing the transaction.
     SignerInfo signer_info = 12;
+
+    // Optional timeout_height
+    uint64 timeout_height = 13;
 }
 
 // Result containing the signed and encoded transaction.