diff --git a/packages/frontend-plugin-api/api-report.md b/packages/frontend-plugin-api/api-report.md
index c5d104fc55..8799253fbd 100644
--- a/packages/frontend-plugin-api/api-report.md
+++ b/packages/frontend-plugin-api/api-report.md
@@ -19,7 +19,12 @@ import { ZodTypeDef } from 'zod';
 
 // @public (undocumented)
 export type AnyExtensionDataMap = {
-  [name in string]: ExtensionDataRef<any, any>;
+  [name in string]: ExtensionDataRef<
+    unknown,
+    {
+      optional?: true;
+    }
+  >;
 };
 
 // @public (undocumented)
diff --git a/packages/frontend-plugin-api/src/wiring/createExtension.ts b/packages/frontend-plugin-api/src/wiring/createExtension.ts
index f9eb159000..dd365a87d8 100644
--- a/packages/frontend-plugin-api/src/wiring/createExtension.ts
+++ b/packages/frontend-plugin-api/src/wiring/createExtension.ts
@@ -21,7 +21,7 @@ import { BackstagePlugin } from './createPlugin';
 
 /** @public */
 export type AnyExtensionDataMap = {
-  [name in string]: ExtensionDataRef<any, any>;
+  [name in string]: ExtensionDataRef<unknown, { optional?: true }>;
 };
 
 /** @public */