diff --git a/.changeset/bundled-manifest-api-0-21-0.md b/.changeset/bundled-manifest-api-0-21-0.md
new file mode 100644
index 0000000..8bedf67
--- /dev/null
+++ b/.changeset/bundled-manifest-api-0-21-0.md
@@ -0,0 +1,5 @@
+---
+'@seamless-auth/core': patch
+---
+
+The bundled fallback adapter manifest is the one auth API 0.21.0 publishes.
diff --git a/packages/core/src/manifest/bundledManifest.ts b/packages/core/src/manifest/bundledManifest.ts
index b3230b2..a298c92 100644
--- a/packages/core/src/manifest/bundledManifest.ts
+++ b/packages/core/src/manifest/bundledManifest.ts
@@ -3,7 +3,7 @@ import type { AdapterManifest } from "./adapterManifest.js";
 
 export const BUNDLED_ADAPTER_MANIFEST: AdapterManifest = {
   "schemaVersion": 1,
-  "apiVersion": "0.20.0",
+  "apiVersion": "0.21.0",
   "session": {
     "subject": "sub",
     "token": "token",