diff --git a/filter/chainsync/chainsync_test.go b/filter/chainsync/chainsync_test.go
index 3d0b950..c5fdb26 100644
--- a/filter/chainsync/chainsync_test.go
+++ b/filter/chainsync/chainsync_test.go
@@ -135,6 +135,10 @@ func (m MockOutput) ToPlutusData() data.PlutusData {
 	return nil
 }
 
+func (m MockOutput) String() string {
+	return ""
+}
+
 func (l *MockLogger) Info(msg string, args ...any)  {}
 func (l *MockLogger) Error(msg string, args ...any) {}
 func (l *MockLogger) Debug(msg string, args ...any) {}
diff --git a/go.mod b/go.mod
index 4b9f9dd..84d7894 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ toolchain go1.24.4
 require (
 	github.com/SundaeSwap-finance/kugo v1.3.0
 	github.com/SundaeSwap-finance/ogmigo/v6 v6.1.0
-	github.com/blinklabs-io/gouroboros v0.134.2
+	github.com/blinklabs-io/gouroboros v0.135.1
 	github.com/blinklabs-io/plutigo v0.0.12
 	github.com/btcsuite/btcd/btcutil v1.1.6
 	github.com/gen2brain/beeep v0.11.1
diff --git a/go.sum b/go.sum
index 8f8731a..4138aa0 100644
--- a/go.sum
+++ b/go.sum
@@ -15,8 +15,8 @@ github.com/aws/aws-sdk-go v1.55.6 h1:cSg4pvZ3m8dgYcgqB97MrcdjUmZ1BeMYKUxMMB89IPk
 github.com/aws/aws-sdk-go v1.55.6/go.mod h1:eRwEWoyTWFMVYVQzKMNHWP5/RV4xIUGMQfXQHfHkpNU=
 github.com/bits-and-blooms/bitset v1.20.0 h1:2F+rfL86jE2d/bmw7OhqUg2Sj/1rURkBn3MdfoPyRVU=
 github.com/bits-and-blooms/bitset v1.20.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
-github.com/blinklabs-io/gouroboros v0.134.2 h1:ADkkZTYOvocbjO6IL6c/4I+ZTX6/LDLBuPTLiDQ/2KE=
-github.com/blinklabs-io/gouroboros v0.134.2/go.mod h1:N4smrM9nmuSkYV92D7IL4z00/iAkbXysT1Ld7saVWeI=
+github.com/blinklabs-io/gouroboros v0.135.1 h1:2Z+GkULXKMFb/D1x7EE/LkCesAt/MQxrf3JNffBWvF4=
+github.com/blinklabs-io/gouroboros v0.135.1/go.mod h1:eCXFpt2fOhp2Id/0AqMaI/qr0bodbS0SIAOpNZVu9Iw=
 github.com/blinklabs-io/ouroboros-mock v0.3.8 h1:+DAt2rx0ouZUxee5DBMgZq3I1+ZdxFSHG9g3tYl/FKU=
 github.com/blinklabs-io/ouroboros-mock v0.3.8/go.mod h1:UwQIf4KqZwO13P9d90fbi3UL/X7JaJfeEbqk+bEeFQA=
 github.com/blinklabs-io/plutigo v0.0.12 h1:DxnYKvKYn9OlgiTJi5Ofd97znSJWUtVZjZFqxW9HW/A=
diff --git a/input/chainsync/transaction_output.go b/input/chainsync/transaction_output.go
index 99e3774..e699cad 100644
--- a/input/chainsync/transaction_output.go
+++ b/input/chainsync/transaction_output.go
@@ -1,4 +1,4 @@
-// Copyright 2024 Blink Labs Software
+// Copyright 2025 Blink Labs Software
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -173,3 +173,8 @@ func (txOut ResolvedTransactionOutput) ToPlutusData() data.PlutusData {
 	// Placeholder for PlutusData representation
 	return nil
 }
+
+func (txOut ResolvedTransactionOutput) String() string {
+	// Placeholder for string representation
+	return ""
+}