diff --git a/bip-0054/test_vectors/txsize.json b/bip-0054/test_vectors/txsize.json
index 0f4a37d8..50540b61 100644
--- a/bip-0054/test_vectors/txsize.json
+++ b/bip-0054/test_vectors/txsize.json
@@ -34,6 +34,11 @@
         "tx": "02000000000101827da3d85a6547d6b03662d2cb86982d655a6f390547285a3bf9ec9f28e0c8831500000000ffffffff0100000000000000000451024e7301415a78b5a14a2527feb02c08b8124e74c3b9bcc1bd3dba1fbfa87f1c930f28a46fea2bf375105dfd835e212c9127aad4976c46ef86be02edbb681e6f38f9a9e06f0100000000",
         "valid": false
     },
+    {
+        "comment": "A 64-byte Segwit transaction (1 p2tr input with annex, 1 OP_RETURN output).",
+        "tx": "02000000000101827da3d85a6547d6b03662d2cb86982d655a6f390547285a3bf9ec9f28e0c8831500000000ffffffff010000000000000000046a02ab0102415a78b5a14a2527feb02c08b8124e74c3b9bcc1bd3dba1fbfa87f1c930f28a46fea2bf375105dfd835e212c9127aad4976c46ef86be02edbb681e6f38f9a9e06f01064242ffab212100000000",
+        "valid": false
+    },
     {
         "comment": "Historical 64-byte transaction 892f44a49de6f5b212cdbea514d09e692d9fed5d897f37bcef14bd0eedebf193",
         "tx": "0200000001deb98691723fa71260ffca6ea0a7bc0a63b0a8a366e1b585caad47fb269a2ce401000000030251b201000000010000000000000000016a00000000",
@@ -60,4 +65,3 @@
         "valid": false
     }
 ]
-