diff --git a/backend/@types/random-bigint/index.d.ts b/backend/@types/random-bigint/index.d.ts
new file mode 100644
index 000000000..e76cf8e1f
--- /dev/null
+++ b/backend/@types/random-bigint/index.d.ts
@@ -0,0 +1,5 @@
+/* eslint-disable @typescript-eslint/ban-types */
+declare module 'random-bigint' {
+  export function random(bits: number, cb?: (err: Error, num: BigInt) => void): BigInt
+  export = random
+}