diff --git a/types/imagemin/index.d.ts b/types/imagemin/index.d.ts
index d6bfb67e13af08..6dbe08613013cd 100644
--- a/types/imagemin/index.d.ts
+++ b/types/imagemin/index.d.ts
@@ -12,7 +12,7 @@ declare namespace imagemin {
     function buffer(input: Buffer, options?: BufferOptions): Promise<Buffer>;
 }
 
-export type Plugin = (input: Buffer) => Promise<Buffer>;
+export type Plugin = (input: Uint8Array) => Promise<Uint8Array>;
 
 export interface Options {
     destination?: string | undefined;
diff --git a/types/imagemin/package.json b/types/imagemin/package.json
index b5d697d8c0e385..9269b0477fc5bd 100644
--- a/types/imagemin/package.json
+++ b/types/imagemin/package.json
@@ -1,7 +1,7 @@
 {
     "private": true,
     "name": "@types/imagemin",
-    "version": "8.0.9999",
+    "version": "9.0.9999",
     "projects": [
         "https://github.com/imagemin/imagemin#readme"
     ],