diff --git a/lib/src/bitcoin/script/op_code/constant.dart b/lib/src/bitcoin/script/op_code/constant.dart
index 6ef314b..7af997d 100644
--- a/lib/src/bitcoin/script/op_code/constant.dart
+++ b/lib/src/bitcoin/script/op_code/constant.dart
@@ -253,7 +253,7 @@ class BitcoinOpCodeConst {
   static const List<int> emptyTxSequence = [0x00, 0x00, 0x00, 0x00];
 
   static const List<int> absoluteTimelockSequence = [0xfe, 0xff, 0xff, 0xff];
-  static const List<int> replaceByFeeSequence = [0x01, 0x00, 0x00, 0x00];
+  static const List<int> replaceByFeeSequence = [0xfd, 0xff, 0xff, 0xff];
 
   /// Script version and Bitcoin-related identifiers
   static const int leafVersionTapscript = 0xc0;
diff --git a/lib/src/transaction_builder/forked_transaction_builder.dart b/lib/src/transaction_builder/forked_transaction_builder.dart
index c85a74e..05f5848 100644
--- a/lib/src/transaction_builder/forked_transaction_builder.dart
+++ b/lib/src/transaction_builder/forked_transaction_builder.dart
@@ -264,10 +264,12 @@ that demonstrate the right to spend the bitcoins associated with the correspondi
       });
     }
     final inputs = sortedUtxos.map((e) => e.utxo.toInput()).toList();
-    if (enableRBF && inputs.isNotEmpty) {
-      inputs[0] = inputs[0].copyWith(
-        sequence: BitcoinOpCodeConst.replaceByFeeSequence,
-      );
+    if (enableRBF) {
+      for (int i = 0; i < inputs.length; i++) {
+        inputs[i] = inputs[i].copyWith(
+          sequence: BitcoinOpCodeConst.replaceByFeeSequence,
+        );
+      }
     }
     return (
       List<TxInput>.unmodifiable(inputs),
diff --git a/lib/src/transaction_builder/transaction_builder.dart b/lib/src/transaction_builder/transaction_builder.dart
index 79e9832..f3dc2c2 100644
--- a/lib/src/transaction_builder/transaction_builder.dart
+++ b/lib/src/transaction_builder/transaction_builder.dart
@@ -414,10 +414,12 @@ that demonstrate the right to spend the bitcoins associated with the correspondi
       });
     }
     final inputs = sortedUtxos.map((e) => e.utxo.toInput()).toList();
-    if (enableRBF && inputs.isNotEmpty) {
-      inputs[0] = inputs[0].copyWith(
-        sequence: BitcoinOpCodeConst.replaceByFeeSequence,
-      );
+    if (enableRBF) {
+      for (int i = 0; i < inputs.length; i++) {
+        inputs[i] = inputs[i].copyWith(
+          sequence: BitcoinOpCodeConst.replaceByFeeSequence,
+        );
+      }
     }
     return (
       List<TxInput>.unmodifiable(inputs),