diff --git a/spec/versionedsubmitblockrequest_json_test.go b/spec/versionedsubmitblockrequest_json_test.go
index 9e061f7..0efeb01 100644
--- a/spec/versionedsubmitblockrequest_json_test.go
+++ b/spec/versionedsubmitblockrequest_json_test.go
@@ -40,7 +40,7 @@ func TestVersionedSubmitBlockRequestJSON(t *testing.T) {
 		{
 			name:  "VersionMissing",
 			input: []byte(`{"data":{"message":{"header":{"parent_hash":"0x17f4eeae822cc81533016678413443b95e34517e67f12b4a3a92ff6b66f972ef","fee_recipient":"0x58E809C71e4885cB7B3f1D5c793AB04eD239d779","state_root":"0x3d6e230e6eceb8f3db582777b1500b8b31b9d268339e7b32bba8d6f1311b211d","receipts_root":"0xea760203509bdde017a506b12c825976d12b04db7bce9eca9e1ed007056a3f36","logs_bloom":"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","prev_randao":"0x76ff751467270668df463600d26dba58297a986e649bac84ea856712d4779c00","block_number":"2983837628677007840","gas_limit":"6738255228996962210","gas_used":"5573520557770513197","timestamp":"1744720080366521389","extra_data":"0xc648","base_fee_per_gas":"88770397543877639215846057887940126737648744594802753726778414602657613619599","block_hash":"0x42c294e902bfc9884c1ce5fef156d4661bb8f0ff488bface37f18c3e7be64b0f","transactions_root":"0x8457d0eb7611a621e7a094059f087415ffcfc91714fc184a1f3c48db06b4d08b","withdrawals_root":"0x5c1a7e3e0eab917a7c0d677c6b692ed55ce05f07d572e09b1c06d558f474ea7a"},"value":"12345","pubkey":"0x010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101"},"signature":"0x010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101"}}`),
-			err:   "unsupported data version phase0",
+			err:   "unsupported data version unknown",
 		},
 		{
 			name:  "VersionUnknown",