diff --git a/CHANGELOG.md b/CHANGELOG.md
index 119e4df55f..8bc6f97071 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+[0.13.1](https://github.com/ordinals/ord/releases/tag/0.13.1) - 2023-12-16
+--------------------------------------------------------------------------
+
+### Fixed
+- Use pre-segwit transaction serialization for fundrawtransaction (#2865)
+
 [0.13.0](https://github.com/ordinals/ord/releases/tag/0.13.0) - 2023-12-15
 --------------------------------------------------------------------------
 
diff --git a/Cargo.lock b/Cargo.lock
index 1039599ff1..4ef42cfb21 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2095,7 +2095,7 @@ checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
 [[package]]
 name = "ord"
-version = "0.13.0"
+version = "0.13.1"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -3144,18 +3144,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.50"
+version = "1.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9a7210f5c9a7156bb50aa36aed4c95afb51df0df00713949448cf9e97d382d2"
+checksum = "f11c217e1416d6f036b870f14e0413d480dbf28edbee1f877abaf0206af43bb7"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.50"
+version = "1.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "266b2e40bc00e5a6c09c3584011e08b06f123c00362c92b975ba9843aaaa14b8"
+checksum = "01742297787513b79cf8e29d1056ede1313e2420b7b3b15d0a768b4921f549df"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 910fa8d89a..4fa8a097ef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "ord"
 description = "◉ Ordinal wallet and block explorer"
-version = "0.13.0"
+version = "0.13.1"
 license = "CC0-1.0"
 edition = "2021"
 autotests = false
diff --git a/src/lib.rs b/src/lib.rs
index 7b8921141f..c18bf58866 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -160,15 +160,27 @@ fn fund_raw_transaction(
   fee_rate: FeeRate,
   unfunded_transaction: &Transaction,
 ) -> Result<Vec<u8>> {
+  let mut buffer = Vec::new();
+
+  {
+    unfunded_transaction.version.consensus_encode(&mut buffer)?;
+    unfunded_transaction.input.consensus_encode(&mut buffer)?;
+    unfunded_transaction.output.consensus_encode(&mut buffer)?;
+    unfunded_transaction
+      .lock_time
+      .consensus_encode(&mut buffer)?;
+  }
+
   Ok(
     client
       .fund_raw_transaction(
-        unfunded_transaction,
+        &buffer,
         Some(&bitcoincore_rpc::json::FundRawTransactionOptions {
           // NB. This is `fundrawtransaction`'s `feeRate`, which is fee per kvB
           // and *not* fee per vB. So, we multiply the fee rate given by the user
           // by 1000.
           fee_rate: Some(Amount::from_sat((fee_rate.n() * 1000.0).ceil() as u64)),
+          change_position: Some(unfunded_transaction.output.len().try_into()?),
           ..Default::default()
         }),
         Some(false),
diff --git a/test-bitcoincore-rpc/src/lib.rs b/test-bitcoincore-rpc/src/lib.rs
index 3a3a1560a2..b12cf61fbf 100644
--- a/test-bitcoincore-rpc/src/lib.rs
+++ b/test-bitcoincore-rpc/src/lib.rs
@@ -162,6 +162,8 @@ impl From<OutPoint> for JsonOutPoint {
 struct FundRawTransactionOptions {
   #[serde(with = "bitcoin::amount::serde::as_btc::opt")]
   fee_rate: Option<Amount>,
+  #[serde(skip_serializing_if = "Option::is_none")]
+  change_position: Option<u32>,
 }
 
 #[derive(Deserialize, Clone, PartialEq, Eq, Debug, Serialize)]
diff --git a/test-bitcoincore-rpc/src/server.rs b/test-bitcoincore-rpc/src/server.rs
index 4655939f92..3ec18b188d 100644
--- a/test-bitcoincore-rpc/src/server.rs
+++ b/test-bitcoincore-rpc/src/server.rs
@@ -1,9 +1,11 @@
 use {
   super::*,
   bitcoin::{
+    consensus::Decodable,
     secp256k1::{rand, KeyPair, Secp256k1, XOnlyPublicKey},
     Witness,
   },
+  std::io::Cursor,
 };
 
 pub(crate) struct Server {
@@ -243,7 +245,26 @@ impl Api for Server {
     options: Option<FundRawTransactionOptions>,
     _is_witness: Option<bool>,
   ) -> Result<FundRawTransactionResult, jsonrpc_core::Error> {
-    let mut transaction: Transaction = deserialize(&hex::decode(tx).unwrap()).unwrap();
+    let options = options.unwrap();
+
+    let mut cursor = Cursor::new(hex::decode(tx).unwrap());
+
+    let version = i32::consensus_decode_from_finite_reader(&mut cursor).unwrap();
+    let input = Vec::<TxIn>::consensus_decode_from_finite_reader(&mut cursor).unwrap();
+    let output = Decodable::consensus_decode_from_finite_reader(&mut cursor).unwrap();
+    let lock_time = Decodable::consensus_decode_from_finite_reader(&mut cursor).unwrap();
+
+    let mut transaction = Transaction {
+      version,
+      input,
+      output,
+      lock_time,
+    };
+
+    assert_eq!(
+      options.change_position,
+      Some(transaction.output.len().try_into().unwrap())
+    );
 
     let state = self.state();
 
@@ -294,7 +315,7 @@ impl Api for Server {
       script_pubkey: ScriptBuf::new(),
     });
 
-    let fee = if let Some(fee_rate) = options.and_then(|options| options.fee_rate) {
+    let fee = if let Some(fee_rate) = options.fee_rate {
       // increase vsize to account for the witness that `fundrawtransaction` will add
       let funded_vsize = transaction.vsize() as f64 + 68.0 / 4.0;
       let funded_kwu = funded_vsize / 1000.0;