diff --git a/.changeset/afraid-ads-happen.md b/.changeset/afraid-ads-happen.md
new file mode 100644
index 0000000..ba2e8ef
--- /dev/null
+++ b/.changeset/afraid-ads-happen.md
@@ -0,0 +1,5 @@
+---
+"@blaze-cardano/tx": minor
+---
+
+This checks the protocol version to determine if the new script data hash requirements are current yet or not.
diff --git a/packages/blaze-tx/src/tx.ts b/packages/blaze-tx/src/tx.ts
index 43192ae..ac59740 100644
--- a/packages/blaze-tx/src/tx.ts
+++ b/packages/blaze-tx/src/tx.ts
@@ -955,7 +955,9 @@ export class TxBuilder {
       // Initialize a CBOR writer to encode the script data.
       const writer = new CborWriter();
       // Encode redeemers and datums into CBOR format.
-      if (redeemers.length === 0) {
+      // In the conway era, the format changes
+      const conway = this.params.protocolVersion.major === 9;
+      if (conway && redeemers.length === 0) {
         // An empty redeemer set is always an empty map, as of conway
         writer.writeStartMap(0);
       } else {