diff --git a/src/json-crdt-extensions/peritext/slice/PersistedSlice.ts b/src/json-crdt-extensions/peritext/slice/PersistedSlice.ts
index 4f7a1ac4e2..66fa218fb4 100644
--- a/src/json-crdt-extensions/peritext/slice/PersistedSlice.ts
+++ b/src/json-crdt-extensions/peritext/slice/PersistedSlice.ts
@@ -74,7 +74,7 @@ export class PersistedSlice<T = string> extends Range<T> implements MutableSlice
 
   public update(params: SliceUpdateParams<T>): void {
     let updateHeader = false;
-    let {start, end} = this;
+    const {start, end} = this;
     const changes: [number, unknown][] = [];
     if (params.behavior !== undefined) {
       this.behavior = params.behavior;
diff --git a/src/json-crdt-extensions/peritext/slice/__tests__/PersistedSlice.spec.ts b/src/json-crdt-extensions/peritext/slice/__tests__/PersistedSlice.spec.ts
index 7d595dd708..08d75e9dad 100644
--- a/src/json-crdt-extensions/peritext/slice/__tests__/PersistedSlice.spec.ts
+++ b/src/json-crdt-extensions/peritext/slice/__tests__/PersistedSlice.spec.ts
@@ -73,4 +73,3 @@ describe('.del() and .isDel()', () => {
     expect(slice3).toBe(undefined);
   });
 });
-
diff --git a/src/json-crdt-extensions/peritext/slice/__tests__/Slices.spec.ts b/src/json-crdt-extensions/peritext/slice/__tests__/Slices.spec.ts
index 7144ef64c1..f2f29c0e6a 100644
--- a/src/json-crdt-extensions/peritext/slice/__tests__/Slices.spec.ts
+++ b/src/json-crdt-extensions/peritext/slice/__tests__/Slices.spec.ts
@@ -154,7 +154,7 @@ describe('.delSlices()', () => {
 });
 
 describe('.refresh()', () => {
-  const testSliceUpdate = (name: string, update: (controls: {range: Range, slice: PersistedSlice}) => void) => {
+  const testSliceUpdate = (name: string, update: (controls: {range: Range; slice: PersistedSlice}) => void) => {
     test('changes hash on: ' + name, () => {
       const {peritext, encodeAndDecode} = setup();
       const range = peritext.rangeAt(6, 5);