diff --git a/circuits b/circuits
index fdd7a3577de..5ae96a0f8dc 160000
--- a/circuits
+++ b/circuits
@@ -1 +1 @@
-Subproject commit fdd7a3577deb2bc6fd90bb68b16c654695331d08
+Subproject commit 5ae96a0f8dc01618c0100903023c40904089985a
diff --git a/yarn-project/aztec-rpc/src/account_state/account_state.ts b/yarn-project/aztec-rpc/src/account_state/account_state.ts
index e650ecfda6b..f137539f155 100644
--- a/yarn-project/aztec-rpc/src/account_state/account_state.ts
+++ b/yarn-project/aztec-rpc/src/account_state/account_state.ts
@@ -2,7 +2,7 @@ import { AcirSimulator } from '@aztec/acir-simulator';
 import { AztecNode } from '@aztec/aztec-node';
 import { Grumpkin } from '@aztec/barretenberg.js/crypto';
 import { KERNEL_NEW_COMMITMENTS_LENGTH, OldTreeRoots, TxRequest } from '@aztec/circuits.js';
-import { AztecAddress, Fr, Point, createDebugLogger } from '@aztec/foundation';
+import { AztecAddress, Fr, Point, keccak, createDebugLogger } from '@aztec/foundation';
 import { INITIAL_L2_BLOCK_NUM } from '@aztec/l1-contracts';
 import { L2BlockContext } from '@aztec/types';
 import { UnverifiedData } from '@aztec/types';
@@ -63,6 +63,7 @@ export class AccountState {
     if (!functionDao) {
       throw new Error('Unknown function.');
     }
+    const acirHash = keccak(Buffer.from(functionDao.bytecode, 'hex'));
 
     const oldRoots = new OldTreeRoots(Fr.ZERO, Fr.ZERO, Fr.ZERO, Fr.ZERO); // TODO - get old roots from the database/node
 
@@ -76,7 +77,7 @@ export class AccountState {
       oldRoots,
     );
 
-    return { contract, oldRoots, executionResult };
+    return { contract, oldRoots, executionResult, acirHash };
   }
 
   public createUnverifiedData(contract: AztecAddress, newNotes: { preimage: Fr[]; storageSlot: Fr }[]): UnverifiedData {
diff --git a/yarn-project/aztec-rpc/src/aztec_rpc_server/aztec_rpc_server.ts b/yarn-project/aztec-rpc/src/aztec_rpc_server/aztec_rpc_server.ts
index cf11fff6637..f366337304d 100644
--- a/yarn-project/aztec-rpc/src/aztec_rpc_server/aztec_rpc_server.ts
+++ b/yarn-project/aztec-rpc/src/aztec_rpc_server/aztec_rpc_server.ts
@@ -201,7 +201,7 @@ export class AztecRPCServer implements AztecRPCClient {
   public async createTx(txRequest: TxRequest, signature: EcdsaSignature) {
     const accountState = this.ensureAccount(txRequest.from);
 
-    const { executionResult, oldRoots, contract } = await accountState.simulate(txRequest);
+    const { executionResult, oldRoots, contract, acirHash } = await accountState.simulate(txRequest);
 
     this.log(`Executing Prover...`);
     const { publicInputs } = await this.kernelProver.prove(
@@ -215,6 +215,7 @@ export class AztecRPCServer implements AztecRPCClient {
       (committment: Buffer) => {
         return this.getContractSiblingPath(committment);
       },
+      acirHash,
     );
 
     this.log(`Proof completed!`);
diff --git a/yarn-project/circuits.js/src/structs/__snapshots__/kernel.test.ts.snap b/yarn-project/circuits.js/src/structs/__snapshots__/kernel.test.ts.snap
index 48ed0d967d2..9e13822bd2e 100644
--- a/yarn-project/circuits.js/src/structs/__snapshots__/kernel.test.ts.snap
+++ b/yarn-project/circuits.js/src/structs/__snapshots__/kernel.test.ts.snap
@@ -459,6 +459,7 @@ leaf_index: 8225
 sibling_path: [ 0x2021 0x2022 0x2023 0x2024 ]
 
 portal_contract_address: 0x4141414141414141414141414141414141414141
+acir_hash: 0x2061
 
 "
 `;
diff --git a/yarn-project/circuits.js/src/structs/kernel.test.ts b/yarn-project/circuits.js/src/structs/kernel.test.ts
index c0a6a979a2c..d1082873a8d 100644
--- a/yarn-project/circuits.js/src/structs/kernel.test.ts
+++ b/yarn-project/circuits.js/src/structs/kernel.test.ts
@@ -1,6 +1,5 @@
 import { expectSerializeToMatchSnapshot } from '../tests/expectSerialize.js';
 import { makePreviousKernelData, makePrivateKernelInputs, makePrivateKernelPublicInputs } from '../tests/factories.js';
-import { CircuitsWasm } from '../wasm/circuits_wasm.js';
 
 describe('structs/kernel', () => {
   it(`serializes and prints previous_kernel_data`, async () => {
@@ -19,8 +18,7 @@ describe('structs/kernel', () => {
     );
   });
 
-  // TODO: Reenable once we can move back to circuits master and have this c_bind available
-  it.skip(`serializes and prints private_kernel_public_inputs`, async () => {
+  it(`serializes and prints private_kernel_public_inputs`, async () => {
     const kernelInputs = makePrivateKernelPublicInputs();
     await expectSerializeToMatchSnapshot(
       kernelInputs.toBuffer(),
diff --git a/yarn-project/circuits.js/src/structs/kernel.ts b/yarn-project/circuits.js/src/structs/kernel.ts
index 09f3af9d53e..42aee2cae25 100644
--- a/yarn-project/circuits.js/src/structs/kernel.ts
+++ b/yarn-project/circuits.js/src/structs/kernel.ts
@@ -299,6 +299,7 @@ export class PrivateCallData {
     public functionLeafMembershipWitness: MembershipWitness<typeof FUNCTION_TREE_HEIGHT>,
     public contractLeafMembershipWitness: MembershipWitness<typeof CONTRACT_TREE_HEIGHT>,
     public portalContractAddress: EthAddress,
+    public acirHash: Fr,
   ) {
     assertLength(this, 'privateCallStackPreimages', PRIVATE_CALL_STACK_LENGTH);
   }
@@ -318,6 +319,7 @@ export class PrivateCallData {
       fields.functionLeafMembershipWitness,
       fields.contractLeafMembershipWitness,
       fields.portalContractAddress,
+      fields.acirHash,
     ] as const;
   }
 
diff --git a/yarn-project/circuits.js/src/tests/factories.ts b/yarn-project/circuits.js/src/tests/factories.ts
index cb7fd4ed344..3c94b69ed2b 100644
--- a/yarn-project/circuits.js/src/tests/factories.ts
+++ b/yarn-project/circuits.js/src/tests/factories.ts
@@ -188,11 +188,12 @@ export function makePrivateCallData(seed = 1): PrivateCallData {
   return PrivateCallData.from({
     callStackItem: makeCallStackItem(seed),
     privateCallStackPreimages: range(PRIVATE_CALL_STACK_LENGTH, seed + 0x10).map(makeCallStackItem),
-    contractLeafMembershipWitness: makeMembershipWitness(CONTRACT_TREE_HEIGHT, seed + 0x20),
-    functionLeafMembershipWitness: makeMembershipWitness(FUNCTION_TREE_HEIGHT, seed + 0x30),
-    portalContractAddress: makeEthAddress(seed + 0x40),
     proof: makeDynamicSizeBuffer(16, seed + 0x50),
     vk: makeVerificationKey(),
+    functionLeafMembershipWitness: makeMembershipWitness(FUNCTION_TREE_HEIGHT, seed + 0x30),
+    contractLeafMembershipWitness: makeMembershipWitness(CONTRACT_TREE_HEIGHT, seed + 0x20),
+    portalContractAddress: makeEthAddress(seed + 0x40),
+    acirHash: fr(seed + 0x60),
   });
 }
 
diff --git a/yarn-project/foundation/src/wasm/wasm/async_call_state.ts b/yarn-project/foundation/src/wasm/wasm/async_call_state.ts
index 17554f4889d..68ce83e28f6 100644
--- a/yarn-project/foundation/src/wasm/wasm/async_call_state.ts
+++ b/yarn-project/foundation/src/wasm/wasm/async_call_state.ts
@@ -37,6 +37,8 @@ export class AsyncCallState {
   private ASYNCIFY_DATA_SIZE = 16 * 1024;
   private asyncifyDataAddr!: number;
   private asyncPromise?: Promise<any>;
+  // For debug purposes, the last running function
+  private debugLastFuncName?: string;
   private wasm!: WasmModule;
   private state?: AsyncFnState;
   private callExport!: (...args: any[]) => number;
@@ -84,9 +86,12 @@ export class AsyncCallState {
    */
   public async call(name: string, ...args: any) {
     if (this.state) {
-      throw new Error(`Can only handle one async call at a time: ${name}(${args})`);
+      throw new Error(
+        `Can only handle one async call at a time: Can't run ${name}(${args}) because we are still running ${this.debugLastFuncName}`,
+      );
     }
     this.state = { continuation: false };
+    this.debugLastFuncName = name;
     let result = this.callExport(name, ...args);
 
     while (this.asyncPromise) {
diff --git a/yarn-project/kernel-prover/src/index.ts b/yarn-project/kernel-prover/src/index.ts
index 95659001faa..4dd9df422db 100644
--- a/yarn-project/kernel-prover/src/index.ts
+++ b/yarn-project/kernel-prover/src/index.ts
@@ -37,6 +37,7 @@ export class KernelProver {
     oldRoots: OldTreeRoots,
     getFunctionTreeInfo: (callStackItem: PrivateCallStackItem) => Promise<FunctionTreeInfo>,
     getContractSiblingPath: (committment: Buffer) => Promise<MembershipWitness<typeof CONTRACT_TREE_HEIGHT>>,
+    acirHash: Buffer,
   ): Promise<{ publicInputs: PrivateKernelPublicInputs; proof: Buffer }> {
     const wasm = await CircuitsWasm.get();
     // TODO: implement this
@@ -63,6 +64,7 @@ export class KernelProver {
       functionTreeInfo.membershipWitness,
       contractLeafMembershipWitness,
       txRequest.txContext.contractDeploymentData.portalContractAddress,
+      Fr.fromBuffer(Buffer.alloc(32, 0)),//acirHash, // FIXME: https://github.com/AztecProtocol/aztec3-packages/issues/262
     );
 
     const previousKernelData: PreviousKernelData = await DummyPreviousKernelData.getDummyPreviousKernelData(wasm);
diff --git a/yarn-project/package.json b/yarn-project/package.json
index 60f5a29f103..56284aa5888 100644
--- a/yarn-project/package.json
+++ b/yarn-project/package.json
@@ -8,7 +8,7 @@
     "docs": "typedoc --out docs/dist && cd docs && yarn serve",
     "formatting": "yarn workspaces foreach -v run formatting",
     "formatting:fix": "yarn workspaces foreach -v run formatting:fix",
-    "test": "yarn workspaces foreach -v run test",
+    "test": "yarn build && yarn workspaces foreach -v run test",
     "build": "tsc -b tsconfig.json",
     "build:dev": "tsc -b tsconfig.json --watch",
     "clean": "yarn workspaces foreach -v run clean"