diff --git a/typings/mysql/lib/Connection.d.ts b/typings/mysql/lib/Connection.d.ts
index 2dabd960fc..6af95e1f7d 100644
--- a/typings/mysql/lib/Connection.d.ts
+++ b/typings/mysql/lib/Connection.d.ts
@@ -183,7 +183,7 @@ export interface ConnectionOptions {
    *
    * You can also specify a function to do the type casting yourself:
    * ```ts
-   * (field: Field, next: () => void) => {
+   * (field: Field, next: () => unknown) => {
    *   return next();
    * }
    * ```
diff --git a/typings/mysql/lib/parsers/typeCast.d.ts b/typings/mysql/lib/parsers/typeCast.d.ts
index b8e975148b..7d62b983ad 100644
--- a/typings/mysql/lib/parsers/typeCast.d.ts
+++ b/typings/mysql/lib/parsers/typeCast.d.ts
@@ -49,6 +49,6 @@ export type Field = Type & {
   geometry: () => Geometry | Geometry[] | null;
 };
 
-export type Next = () => void;
+export type Next = () => unknown;
 
 export type TypeCast = ((field: Field, next: Next) => any) | boolean;
diff --git a/typings/mysql/lib/protocol/sequences/Query.d.ts b/typings/mysql/lib/protocol/sequences/Query.d.ts
index 44d6c910c9..34da54c23c 100644
--- a/typings/mysql/lib/protocol/sequences/Query.d.ts
+++ b/typings/mysql/lib/protocol/sequences/Query.d.ts
@@ -44,7 +44,7 @@ export interface QueryOptions {
    *
    * You can also specify a function to do the type casting yourself:
    * ```ts
-   * (field: Field, next: () => void) => {
+   * (field: Field, next: () => unknown) => {
    *   return next();
    * }
    * ```
diff --git a/website/test/fixtures/external-code-embed/QueryOptions.txt b/website/test/fixtures/external-code-embed/QueryOptions.txt
index e12549ffce..94930ef4cb 100644
--- a/website/test/fixtures/external-code-embed/QueryOptions.txt
+++ b/website/test/fixtures/external-code-embed/QueryOptions.txt
@@ -32,7 +32,7 @@ export interface QueryOptions {
    * Determines if column values should be converted to native JavaScript types. It is not recommended (and may go away / change in the future)
    * to disable type casting, but you can currently do so on either the connection or query level. (Default: true)
    *
-   * You can also specify a function (field: any, next: () => void) => {} to do the type casting yourself.
+   * You can also specify a function (field: any, next: () => unknown) => {} to do the type casting yourself.
    *
    * WARNING: YOU MUST INVOKE the parser using one of these three field functions in your custom typeCast callback. They can only be called once.
    *
@@ -60,4 +60,4 @@ export interface QueryOptions {
    * By specifying a function that returns a readable stream, an arbitrary stream can be sent when sending a local fs file.
    */
   infileStreamFactory?: (path: string) => Readable;
-}
\ No newline at end of file
+}
diff --git a/website/test/resources/external-code-embed/random-methods.txt b/website/test/resources/external-code-embed/random-methods.txt
index ddf6fee73f..c2d1030a2b 100644
--- a/website/test/resources/external-code-embed/random-methods.txt
+++ b/website/test/resources/external-code-embed/random-methods.txt
@@ -41,7 +41,7 @@ export interface QueryOptions {
    * Determines if column values should be converted to native JavaScript types. It is not recommended (and may go away / change in the future)
    * to disable type casting, but you can currently do so on either the connection or query level. (Default: true)
    *
-   * You can also specify a function (field: any, next: () => void) => {} to do the type casting yourself.
+   * You can also specify a function (field: any, next: () => unknown) => {} to do the type casting yourself.
    *
    * WARNING: YOU MUST INVOKE the parser using one of these three field functions in your custom typeCast callback. They can only be called once.
    *