diff --git a/src/source/Source.ts b/src/source/Source.ts
index 3f5feec..a421293 100644
--- a/src/source/Source.ts
+++ b/src/source/Source.ts
@@ -25,6 +25,7 @@ export abstract class Source {
   public abstract readonly baseUrl: string;
 
   private static readonly sourceResultCache = new Cacheable({
+    nonBlocking: true,
     primary: new Keyv({ store: new CacheableMemory({ lruSize: 1024 }) }),
     secondary: new Keyv(new KeyvSqlite(`sqlite://${getCacheDir()}/webstreamr-source-cache-v2.sqlite`)),
     stats: true,
diff --git a/src/utils/height.ts b/src/utils/height.ts
index 6c7a170..18f4251 100644
--- a/src/utils/height.ts
+++ b/src/utils/height.ts
@@ -6,6 +6,7 @@ import { getCacheDir } from './env';
 import { CustomRequestConfig, Fetcher } from './Fetcher';
 
 const playlistHeightCache = new Cacheable({
+  nonBlocking: true,
   primary: new Keyv({ store: new CacheableMemory({ lruSize: 16384 }) }),
   secondary: new Keyv(new KeyvSqlite(`sqlite://${getCacheDir()}/webstreamr-playlist-height-cache.sqlite`)),
 });