diff --git a/.changeset/blue-dingos-heal.md b/.changeset/blue-dingos-heal.md
new file mode 100644
index 000000000000..38cc609799e4
--- /dev/null
+++ b/.changeset/blue-dingos-heal.md
@@ -0,0 +1,7 @@
+---
+"@refinedev/core": patch
+---
+
+fix: added undefined type to `successNotification` and `errorNotification` #6270
+
+Resolves #6270
diff --git a/packages/core/src/contexts/notification/types.ts b/packages/core/src/contexts/notification/types.ts
index 7667d33fbb27..ec2a7e5926d5 100644
--- a/packages/core/src/contexts/notification/types.ts
+++ b/packages/core/src/contexts/notification/types.ts
@@ -11,6 +11,7 @@ export type SuccessErrorNotification<
   successNotification?:
     | OpenNotificationParams
     | false
+    | undefined
     | ((
         data?: TData,
         values?: TVariables,
@@ -23,6 +24,7 @@ export type SuccessErrorNotification<
   errorNotification?:
     | OpenNotificationParams
     | false
+    | undefined
     | ((
         error?: TError,
         values?: TVariables,