diff --git a/build-system/taler-build-scripts b/build-system/taler-build-scripts
index 001f5dd08..23538677f 160000
--- a/build-system/taler-build-scripts
+++ b/build-system/taler-build-scripts
@@ -1 +1 @@
-Subproject commit 001f5dd081fc8729ff8def90c4a1c3f93eb8689a
+Subproject commit 23538677f6c6be2a62f38dc6137ecdd1c76b7b15
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-instances.ts b/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
index fd7a8ca3a..27de8a0a0 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
@@ -193,7 +193,6 @@ export async function runMerchantInstancesTest(t: GlobalTestState) {
     });
     console.log(exc);
     t.assertTrue(exc.errorDetail.httpStatusCode === 401);
-    t.assertDeepEqual(exc.response?.status, 401);
   }
 }
 
diff --git a/packages/taler-util/src/MerchantApiClient.ts b/packages/taler-util/src/MerchantApiClient.ts
index cbdcb9fdf..ccbbf79b3 100644
--- a/packages/taler-util/src/MerchantApiClient.ts
+++ b/packages/taler-util/src/MerchantApiClient.ts
@@ -14,6 +14,7 @@
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
+import { codecForAny } from "./codec.js";
 import {
   createPlatformHttpLib,
   expectSuccessResponseOrThrow,
@@ -221,7 +222,7 @@ export class MerchantApiClient {
     const resp = await this.httpClient.fetch(url.href, {
       headers: this.makeAuthHeader(),
     });
-    return resp.json();
+    return readSuccessResponseJsonOrThrow(resp, codecForAny());
   }
 
   async getInstanceFullDetails(instanceId: string): Promise<any> {