diff --git a/spec/fixtures/sign_verify_vectors.json b/spec/fixtures/sign_verify_vectors.json
index b467640..f71c8dd 100644
--- a/spec/fixtures/sign_verify_vectors.json
+++ b/spec/fixtures/sign_verify_vectors.json
@@ -157,7 +157,7 @@
     ],
     "verify_fail_test_cases": [
         {
-            "sig": "97AC833ADCB1AFA42EBF9E0725616F3C9A0D5B614F6FE283CEAAA37A8FFAF406",
+            "sig": "FED54434AD4CFE953FC527DC6A5E5BE8F6234907B7C187559557CE87A0541C46",
             "key_indices": [0, 1, 2],
             "nonce_indices": [0, 1, 2],
             "msg_index": 0,
@@ -165,7 +165,7 @@
             "comment": "Wrong signature (which is equal to the negation of valid signature)"
         },
         {
-            "sig": "68537CC5234E505BD14061F8DA9E90C220A181855FD8BDB7F127BB12403B4D3B",
+            "sig": "012ABBCB52B3016AC03AD82395A1A415C48B93DEF78718E62A7A90052FE224FB",
             "key_indices": [0, 1, 2],
             "nonce_indices": [0, 1, 2],
             "msg_index": 0,
@@ -183,7 +183,7 @@
     ],
     "verify_error_test_cases": [
         {
-            "sig": "68537CC5234E505BD14061F8DA9E90C220A181855FD8BDB7F127BB12403B4D3B",
+            "sig": "012ABBCB52B3016AC03AD82395A1A415C48B93DEF78718E62A7A90052FE224FB",
             "key_indices": [0, 1, 2],
             "nonce_indices": [4, 1, 2],
             "msg_index": 0,
@@ -196,7 +196,7 @@
             "comment": "Invalid pubnonce"
         },
         {
-            "sig": "68537CC5234E505BD14061F8DA9E90C220A181855FD8BDB7F127BB12403B4D3B",
+            "sig": "012ABBCB52B3016AC03AD82395A1A415C48B93DEF78718E62A7A90052FE224FB",
             "key_indices": [3, 1, 2],
             "nonce_indices": [0, 1, 2],
             "msg_index": 0,