diff --git a/types/yup/index.d.ts b/types/yup/index.d.ts
index e8b98ad957..c7df9bfd4b 100644
--- a/types/yup/index.d.ts
+++ b/types/yup/index.d.ts
@@ -257,6 +257,7 @@ export interface ObjectSchema<T extends object | null | undefined = object> exte
     noUnknown(onlyKnownKeys?: boolean, message?: ObjectLocale['noUnknown']): ObjectSchema<T>;
     transformKeys(callback: (key: any) => any): void;
     camelCase(): ObjectSchema<T>;
+    snakeCase(): ObjectSchema<T>;
     constantCase(): ObjectSchema<T>;
     nullable(isNullable?: true): ObjectSchema<T | null>;
     nullable(isNullable: false): ObjectSchema<Exclude<T, null>>;
diff --git a/types/yup/yup-tests.ts b/types/yup/yup-tests.ts
index a780909d45..1a7b65769c 100644
--- a/types/yup/yup-tests.ts
+++ b/types/yup/yup-tests.ts
@@ -458,6 +458,7 @@ objSchema.noUnknown(true, 'message');
 objSchema.noUnknown(true, () => 'message');
 objSchema.transformKeys(key => key.toUpperCase());
 objSchema.camelCase();
+objSchema.snakeCase();
 objSchema.constantCase();
 
 const description: SchemaDescription = {