diff --git a/src/algos/addUntilReach.ts b/src/algos/addUntilReach.ts
index 0a4a10f..214b784 100644
--- a/src/algos/addUntilReach.ts
+++ b/src/algos/addUntilReach.ts
@@ -22,14 +22,14 @@ import { isDust } from '../dust';
  *
  * Refer to {@link coinselect coinselect} for additional details on input parameters and expected returned values.
  */
-export function addUntilReach({
+export function addUntilReach<Utxo extends OutputWithValue>({
   utxos,
   targets,
   remainder,
   feeRate,
   dustRelayFeeRate = DUST_RELAY_FEE_RATE
 }: {
-  utxos: Array<OutputWithValue>;
+  utxos: Array<Utxo>;
   targets: Array<OutputWithValue>;
   remainder: OutputInstance;
   feeRate: number;
@@ -42,7 +42,7 @@ export function addUntilReach({
   validateFeeRate(dustRelayFeeRate);
 
   const targetsValue = targets.reduce((a, target) => a + target.value, 0);
-  const utxosSoFar: Array<OutputWithValue> = [];
+  const utxosSoFar: Array<Utxo> = [];
 
   for (const candidate of utxos) {
     const txSizeSoFar = vsize(
diff --git a/src/algos/avoidChange.ts b/src/algos/avoidChange.ts
index 141a6e4..f71db53 100644
--- a/src/algos/avoidChange.ts
+++ b/src/algos/avoidChange.ts
@@ -23,14 +23,14 @@ import { isDust } from '../dust';
  *
  * Refer to {@link coinselect coinselect} for additional details on input parameters and expected returned values.
  */
-export function avoidChange({
+export function avoidChange<Utxo extends OutputWithValue>({
   utxos,
   targets,
   remainder,
   feeRate,
   dustRelayFeeRate = DUST_RELAY_FEE_RATE
 }: {
-  utxos: Array<OutputWithValue>;
+  utxos: Array<Utxo>;
   targets: Array<OutputWithValue>;
   /**
    * This is the hypotetical change that this algo will check it would
@@ -47,7 +47,7 @@ export function avoidChange({
   validateFeeRate(dustRelayFeeRate);
 
   const targetsValue = targets.reduce((a, target) => a + target.value, 0);
-  const utxosSoFar: Array<OutputWithValue> = [];
+  const utxosSoFar: Array<Utxo> = [];
 
   for (const candidate of utxos) {
     const utxosSoFarValue = utxosSoFar.reduce((a, utxo) => a + utxo.value, 0);
diff --git a/src/algos/maxFunds.ts b/src/algos/maxFunds.ts
index afb925d..9e2e903 100644
--- a/src/algos/maxFunds.ts
+++ b/src/algos/maxFunds.ts
@@ -22,14 +22,14 @@ import { isDust } from '../dust';
  *
  * Refer to {@link coinselect coinselect} for additional details on input parameters and expected returned values.
  */
-export function maxFunds({
+export function maxFunds<Utxo extends OutputWithValue>({
   utxos,
   targets,
   remainder,
   feeRate,
   dustRelayFeeRate = DUST_RELAY_FEE_RATE
 }: {
-  utxos: Array<OutputWithValue>;
+  utxos: Array<Utxo>;
   targets: Array<OutputWithValue>;
   /**
    * Recipient to send maxFunds
diff --git a/src/coinselect.ts b/src/coinselect.ts
index 498a436..df5793c 100644
--- a/src/coinselect.ts
+++ b/src/coinselect.ts
@@ -70,7 +70,7 @@ function utxoTransferredValue(
  *
  * @see {@link https://bitcoinerlab.com/modules/descriptors} for descriptor info.
  */
-export function coinselect({
+export function coinselect<Utxo extends OutputWithValue>({
   utxos,
   targets,
   remainder,
@@ -81,7 +81,7 @@ export function coinselect({
    * Array of UTXOs for the transaction. Each UTXO includes an `OutputInstance`
    * and its value.
    */
-  utxos: Array<OutputWithValue>;
+  utxos: Array<Utxo>;
   /**
    * Array of transaction targets. If specified, `remainder` is used
    * as the change address.