diff --git a/types/global.d.ts b/types/global.d.ts
new file mode 100644
index 0000000..d6df91f
--- /dev/null
+++ b/types/global.d.ts
@@ -0,0 +1,6 @@
+import * as Yup from 'yup'
+declare module 'yup' {
+	class ArraySchema extends Yup.array {
+		unique(format?: string): this
+	}
+}
\ No newline at end of file