diff --git a/client/lib/patch-db.ts b/client/lib/patch-db.ts
index 75bb3dc..62ccb22 100644
--- a/client/lib/patch-db.ts
+++ b/client/lib/patch-db.ts
@@ -31,10 +31,10 @@ export class PatchDB<T extends { [key: string]: any }> {
 
   constructor(private readonly source$: Observable<Update<T>[]>) {}
 
-  async start(bootstrapper: Bootstrapper<T>) {
+  start(bootstrapper: Bootstrapper<T>) {
     if (this.sub) return
 
-    const initialCache = await bootstrapper.init()
+    const initialCache = bootstrapper.init()
     this.cache$.next(initialCache)
 
     this.sub = this.source$
diff --git a/client/lib/types.ts b/client/lib/types.ts
index cb4ece6..63a8284 100644
--- a/client/lib/types.ts
+++ b/client/lib/types.ts
@@ -18,8 +18,8 @@ export enum PatchOp {
 }
 
 export interface Bootstrapper<T> {
-  init(): Promise<DBCache<T>>
-  update(cache: DBCache<T>): Promise<void>
+  init(): DBCache<T>
+  update(cache: DBCache<T>): void
 }
 
 export interface DBCache<T extends Record<string, any>> {