diff --git a/packages/whale-api-client/src/whale.api.client.ts b/packages/whale-api-client/src/whale.api.client.ts
index 636c239e5..b3f67c7cd 100644
--- a/packages/whale-api-client/src/whale.api.client.ts
+++ b/packages/whale-api-client/src/whale.api.client.ts
@@ -27,8 +27,9 @@ export interface WhaleApiClientOptions {
 
   /**
    * Version of API
+   * `v{major}.{minor}`: `v${number}.${number}`
    */
-  version?: `v${number}.${number}`
+  version?: string
 
   /**
    * Network that whale client is configured to