diff --git a/types/slate-base64-serializer/index.d.ts b/types/slate-base64-serializer/index.d.ts
index 6d356aa1c3..6e55220481 100644
--- a/types/slate-base64-serializer/index.d.ts
+++ b/types/slate-base64-serializer/index.d.ts
@@ -2,7 +2,7 @@
 // Project: https://github.com/ianstormtaylor/slate
 // Definitions by: Brandon Shelton <https://github.com/YangusKhan>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 2.6
+// TypeScript Version: 2.8
 import { Value, Node } from "slate";
 
 export function deserialize(string: string, options?: object): Value;
diff --git a/types/slate-plain-serializer/index.d.ts b/types/slate-plain-serializer/index.d.ts
index ed57cf3cca..1361c7f743 100644
--- a/types/slate-plain-serializer/index.d.ts
+++ b/types/slate-plain-serializer/index.d.ts
@@ -3,7 +3,7 @@
 // Definitions by: Brandon Shelton <https://github.com/YangusKhan>
 //                 Martin Kiefel <https://github.com/mkiefel>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 2.6
+// TypeScript Version: 2.8
 import { BlockProperties, MarkProperties, Value } from 'slate';
 
 export interface DeserializeOptions {