diff --git a/core/tests/upgrade-test/tests/upgrade.test.ts b/core/tests/upgrade-test/tests/upgrade.test.ts
index 665b570ede74..8a596747b454 100644
--- a/core/tests/upgrade-test/tests/upgrade.test.ts
+++ b/core/tests/upgrade-test/tests/upgrade.test.ts
@@ -236,10 +236,10 @@ describe('Upgrade test', function () {
     });
 
     step('Send l1 tx for saving new bootloader', async () => {
-        const path = `${pathToHome}/contracts/system-contracts/bootloader/build/artifacts/playground_batch.yul/playground_batch.yul.zbin`;
+        const path = `${pathToHome}/contracts/system-contracts/zkout/playground_batch.yul/contracts-preprocessed/bootloader/playground_batch.yul.json`;
         let bootloaderCode;
         if (fs.existsSync(path)) {
-            bootloaderCode = '0x'.concat(fs.readFileSync(path).toString());
+            bootloaderCode = '0x'.concat(require(path).bytecode.object);
         } else {
             const legacyPath = `${pathToHome}/contracts/system-contracts/bootloader/build/artifacts/playground_batch.yul.zbin`;
             bootloaderCode = ethers.hexlify(fs.readFileSync(legacyPath));