diff --git a/docs/docs/migration_notes.md b/docs/docs/migration_notes.md
index 2181a6c67857..c2f8904aa0bb 100644
--- a/docs/docs/migration_notes.md
+++ b/docs/docs/migration_notes.md
@@ -5,6 +5,11 @@ keywords: [sandbox, aztec, notes, migration, updating, upgrading]
 ---
 
 Aztec is in full-speed development. Literally every version breaks compatibility with the previous ones. This page attempts to target errors and difficulties you might encounter when upgrading, and how to resolve them.
+
+## TBD
+### [Aztec.nr] Removal of `getSiblingPath` oracle
+Use `getMembershipWitness` oracle instead that returns both the sibling path and an index [index, ...sibling_path].
+
 ## 0.68.0
 ### [archiver, node, pxe] Remove contract artifacts in node and archiver and store function names instead
 Contract artifacts were only in the archiver for debugging purposes. Instead function names are now (optionally) emitted
diff --git a/yarn-project/pxe/src/simulator_oracle/index.ts b/yarn-project/pxe/src/simulator_oracle/index.ts
index 8dd27cda80e9..cc5fdc29a52f 100644
--- a/yarn-project/pxe/src/simulator_oracle/index.ts
+++ b/yarn-project/pxe/src/simulator_oracle/index.ts
@@ -163,7 +163,7 @@ export class SimulatorOracle implements DBOracle {
    * @returns - The index of the commitment. Undefined if it does not exist in the tree.
    */
   async getCommitmentIndex(commitment: Fr) {
-    return await this.findLeafIndex('latest', MerkleTreeId.NOTE_HASH_TREE, commitment);
+    return await this.#findLeafIndex('latest', MerkleTreeId.NOTE_HASH_TREE, commitment);
   }
 
   // We need this in public as part of the EXISTS calls - but isn't used in private
@@ -172,20 +172,16 @@ export class SimulatorOracle implements DBOracle {
   }
 
   async getNullifierIndex(nullifier: Fr) {
-    return await this.findLeafIndex('latest', MerkleTreeId.NULLIFIER_TREE, nullifier);
+    return await this.#findLeafIndex('latest', MerkleTreeId.NULLIFIER_TREE, nullifier);
   }
 
-  public async findLeafIndex(
-    blockNumber: L2BlockNumber,
-    treeId: MerkleTreeId,
-    leafValue: Fr,
-  ): Promise<bigint | undefined> {
+  async #findLeafIndex(blockNumber: L2BlockNumber, treeId: MerkleTreeId, leafValue: Fr): Promise<bigint | undefined> {
     const [leafIndex] = await this.aztecNode.findLeavesIndexes(blockNumber, treeId, [leafValue]);
     return leafIndex;
   }
 
   public async getMembershipWitness(blockNumber: number, treeId: MerkleTreeId, leafValue: Fr): Promise<Fr[]> {
-    const leafIndex = await this.findLeafIndex(blockNumber, treeId, leafValue);
+    const leafIndex = await this.#findLeafIndex(blockNumber, treeId, leafValue);
     if (!leafIndex) {
       throw new Error(`Leaf value: ${leafValue} not found in ${MerkleTreeId[treeId]}`);
     }
diff --git a/yarn-project/simulator/src/client/db_oracle.ts b/yarn-project/simulator/src/client/db_oracle.ts
index 9cb567184a8b..5688f83a984b 100644
--- a/yarn-project/simulator/src/client/db_oracle.ts
+++ b/yarn-project/simulator/src/client/db_oracle.ts
@@ -140,15 +140,6 @@ export interface DBOracle extends CommitmentsDB {
    */
   getBlockHeader(): Promise<BlockHeader>;
 
-  /**
-   * Fetch the index of the leaf in the respective tree
-   * @param blockNumber - The block number at which to get the leaf index.
-   * @param treeId - The id of the tree to search.
-   * @param leafValue - The leaf value buffer.
-   * @returns - The index of the leaf. Undefined if it does not exist in the tree.
-   */
-  findLeafIndex(blockNumber: L2BlockNumber, treeId: MerkleTreeId, leafValue: Fr): Promise<bigint | undefined>;
-
   /**
    * Fetches the index and sibling path of a leaf at a given block from a given tree.
    * @param blockNumber - The block number at which to get the membership witness.