diff --git a/src/fireblocks-sdk.ts b/src/fireblocks-sdk.ts
index 1f7d9c14..09834beb 100644
--- a/src/fireblocks-sdk.ts
+++ b/src/fireblocks-sdk.ts
@@ -59,8 +59,8 @@ import { AxiosProxyConfig } from "axios";
 export * from "./types";
 
 export interface SDKOptions {
-    timeoutInMs: number;
-    proxy: AxiosProxyConfig | false;
+    timeoutInMs?: number;
+    proxy?: AxiosProxyConfig | false;
 }
 
 export class FireblocksSDK {