diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index 4c0063b..b4f23ed 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -151,6 +151,9 @@
 * ``san_idna_names.pem`` - An RSA 2048 bit self-signed certificate containing
   a subject alternative name extension with ``rfc822Name``, ``dNSName``, and
   ``uniformResourceIdentifier`` general names with IDNA (:rfc:`5895`) encoding.
+* ``san_idna2003_dnsname.pem`` - An RSA 2048 bit self-signed certificate
+  containing a subject alternative name extension with an IDNA 2003
+  (:rfc:`3490`) ``dNSName``.
 * ``san_rfc822_names.pem`` - An RSA 2048 bit self-signed certificate containing
   a subject alternative name extension with various ``rfc822Name`` values.
 * ``san_rfc822_idna.pem`` - An RSA 2048 bit self-signed certificate containing
diff --git a/vectors/cryptography_vectors/x509/custom/san_idna2003_dnsname.pem b/vectors/cryptography_vectors/x509/custom/san_idna2003_dnsname.pem
new file mode 100644
index 0000000..42ad9ff
--- /dev/null
+++ b/vectors/cryptography_vectors/x509/custom/san_idna2003_dnsname.pem
@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE-----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==
+-----END CERTIFICATE-----