diff --git a/test/suites/para/test_tanssi_containers.ts b/test/suites/para/test_tanssi_containers.ts
index 505eb11f4..184feae22 100644
--- a/test/suites/para/test_tanssi_containers.ts
+++ b/test/suites/para/test_tanssi_containers.ts
@@ -241,7 +241,7 @@ describeSuite({
 
                 const chainSpec2002 = JSON.parse(spec2002);
                 const containerChainGenesisData = chainSpecToContainerChainGenesisData(paraApi, chainSpec2002);
-                const tx1 = paraApi.tx.registrar.register(2002, containerChainGenesisData);
+                const tx1 = paraApi.tx.registrar.register(2002, containerChainGenesisData, null);
                 const purchasedCredits = 100000n;
                 const requiredBalance = purchasedCredits * 1_000_000n;
                 const tx2 = paraApi.tx.servicesPayment.purchaseCredits(2002, requiredBalance);
diff --git a/test/suites/parathreads/test_tanssi_parathreads.ts b/test/suites/parathreads/test_tanssi_parathreads.ts
index bc5b4ea8e..a9a133750 100644
--- a/test/suites/parathreads/test_tanssi_parathreads.ts
+++ b/test/suites/parathreads/test_tanssi_parathreads.ts
@@ -466,7 +466,7 @@ function createCollatorKeyToNameMap(paraApi, collatorNames: string[]): Record<st
     return collatorName;
 }
 
-async function createTxBatchForCreatingParathread(api, manager, paraId, slotFreq, nextProfileId) {
+async function createTxBatchForCreatingParathread(api, manager, paraId, slotFreq, nextProfileId, headData?: null) {
     const specPaths = {
         2000: "specs/parathreads-template-container-2000.json",
         2001: "specs/parathreads-template-container-2001.json",
@@ -479,7 +479,7 @@ async function createTxBatchForCreatingParathread(api, manager, paraId, slotFreq
 
     const containerChainGenesisData = chainSpecToContainerChainGenesisData(api, rawSpec);
     const txs = [];
-    const tx1 = api.tx.registrar.registerParathread(rawSpec.para_id, slotFreq, containerChainGenesisData);
+    const tx1 = api.tx.registrar.registerParathread(rawSpec.para_id, slotFreq, containerChainGenesisData, headData);
     txs.push(
         api.tx.utility.dispatchAs(
             {