diff --git a/packages/orderbook/src/seaport/seaport-lib-factory.ts b/packages/orderbook/src/seaport/seaport-lib-factory.ts
index 0d6622311e..ffe9384cf1 100644
--- a/packages/orderbook/src/seaport/seaport-lib-factory.ts
+++ b/packages/orderbook/src/seaport/seaport-lib-factory.ts
@@ -48,11 +48,9 @@ export class SeaportLibFactory {
   ) { }
 
   create(orderSeaportVersion?: SeaportVersion, orderSeaportAddress?: string): SeaportLib {
-    const seaportVersion = orderSeaportVersion ?? SEAPORT_CONTRACT_VERSION_V1_5;
     const seaportContractAddress = orderSeaportAddress ?? this.defaultSeaportContractAddress;
 
     return new SeaportLib(convertToV6Provider(this.provider), {
-      seaportVersion,
       balanceAndApprovalChecksOnOrderCreation: true,
       overrides: {
         contractAddress: seaportContractAddress,