diff --git a/yarn-project/merkle-tree/src/standard_indexed_tree/standard_indexed_tree.ts b/yarn-project/merkle-tree/src/standard_indexed_tree/standard_indexed_tree.ts
index 648c86fe4ea5..2d99c3f18e95 100644
--- a/yarn-project/merkle-tree/src/standard_indexed_tree/standard_indexed_tree.ts
+++ b/yarn-project/merkle-tree/src/standard_indexed_tree/standard_indexed_tree.ts
@@ -60,7 +60,7 @@ export const noopDeserializer: FromBuffer<Buffer> = {
  * Standard implementation of an indexed tree.
  */
 export class StandardIndexedTree extends TreeBase<Buffer> implements IndexedTree {
-  #snapshotBuilder = new IndexedTreeSnapshotBuilder(this.store, this, this.leafPreimageFactory);
+  #snapshotBuilder: IndexedTreeSnapshotBuilder;
 
   protected cachedLeafPreimages: { [key: string]: IndexedTreeLeafPreimage } = {};
   protected leaves: AztecMap<ReturnType<typeof buildDbKeyForPreimage>, Buffer>;
@@ -79,6 +79,7 @@ export class StandardIndexedTree extends TreeBase<Buffer> implements IndexedTree
     super(store, hasher, name, depth, size, noopDeserializer, root);
     this.leaves = store.openMap(`tree_${name}_leaves`);
     this.leafIndex = store.openMap(`tree_${name}_leaf_index`);
+    this.#snapshotBuilder = new IndexedTreeSnapshotBuilder(this.store, this, this.leafPreimageFactory);
   }
 
   /**
diff --git a/yarn-project/prover-node/src/test/index.ts b/yarn-project/prover-node/src/test/index.ts
index 41921ded10b5..09e44fe636c6 100644
--- a/yarn-project/prover-node/src/test/index.ts
+++ b/yarn-project/prover-node/src/test/index.ts
@@ -4,8 +4,8 @@ import type { ProverNodePublisher } from '../prover-node-publisher.js';
 import { ProverNode } from '../prover-node.js';
 
 class TestProverNode_ extends ProverNode {
-  public override prover!: EpochProverManager;
-  public override publisher!: ProverNodePublisher;
+  public declare prover: EpochProverManager;
+  public declare publisher: ProverNodePublisher;
 }
 
 export type TestProverNode = TestProverNode_;
diff --git a/yarn-project/sequencer-client/src/test/index.ts b/yarn-project/sequencer-client/src/test/index.ts
index 9b0501bba54f..002a382ab50d 100644
--- a/yarn-project/sequencer-client/src/test/index.ts
+++ b/yarn-project/sequencer-client/src/test/index.ts
@@ -6,15 +6,15 @@ import { Sequencer } from '../sequencer/sequencer.js';
 import type { SequencerTimetable } from '../sequencer/timetable.js';
 
 class TestSequencer_ extends Sequencer {
-  public override publicProcessorFactory!: PublicProcessorFactory;
-  public override timetable!: SequencerTimetable;
-  public override publisher!: SequencerPublisher;
+  public declare publicProcessorFactory: PublicProcessorFactory;
+  public declare timetable: SequencerTimetable;
+  public declare publisher: SequencerPublisher;
 }
 
 export type TestSequencer = TestSequencer_;
 
 class TestSequencerClient_ extends SequencerClient {
-  public override sequencer!: TestSequencer;
+  public declare sequencer: TestSequencer;
 }
 
 export type TestSequencerClient = TestSequencerClient_;
diff --git a/yarn-project/tsconfig.json b/yarn-project/tsconfig.json
index e4244498f4e0..267569912ad4 100644
--- a/yarn-project/tsconfig.json
+++ b/yarn-project/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "es2020",
+    "target": "es2022",
     "lib": ["dom", "esnext", "es2017.object"],
     "module": "NodeNext",
     "moduleResolution": "NodeNext",