diff --git a/utils/test.js b/utils/test.js
index 34f3d7e..c159a81 100644
--- a/utils/test.js
+++ b/utils/test.js
@@ -2,10 +2,10 @@ import { assertEquals } from "https://deno.land/std@0.119.0/testing/asserts.ts"
 import { UTXOEngine } from './engine.js'
 
 // initialize ajv JSON Schema validator
-import Ajv from 'https://esm.sh/ajv@8.7.1'
-import addFormats from 'https://esm.sh/ajv-formats@2.1.0'
+import Ajv from 'https://esm.sh/ajv@8.8.1?pin=v58'
+import addFormats from 'https://esm.sh/ajv-formats@2.1.1'
 
-const ajv = new Ajv({allErrors: true})
+const ajv = new Ajv()
 addFormats(ajv)
 
 const utxo = new UTXOEngine({ silent: true })