diff --git a/src/rln_contract.spec.ts b/src/rln_contract.spec.ts
index 1536c9c..3901538 100644
--- a/src/rln_contract.spec.ts
+++ b/src/rln_contract.spec.ts
@@ -1,6 +1,6 @@
 import chai from "chai";
 import spies from "chai-spies";
-import ethers from "ethers";
+import ethers from "ethers/lib/index.js";
 
 import * as rln from "./index.js";