diff --git a/tests/x509/test_x509.py b/tests/x509/test_x509.py
index 18198361c47ec505ea5a3aa4bdb4fe7229c98bc3_dGVzdHMveDUwOS90ZXN0X3g1MDkucHk=..26178d7b046af04862530d2e19d3093091b61119_dGVzdHMveDUwOS90ZXN0X3g1MDkucHk= 100644
--- a/tests/x509/test_x509.py
+++ b/tests/x509/test_x509.py
@@ -307,7 +307,7 @@
             ExtensionOID.DELTA_CRL_INDICATOR
         )
         assert dci.value == x509.DeltaCRLIndicator(12345678901234567890)
-        assert dci.critical is False
+        assert dci.critical is True
 
     def test_signature(self, backend):
         crl = _load_cert(
diff --git a/vectors/cryptography_vectors/x509/custom/crl_delta_crl_indicator.pem b/vectors/cryptography_vectors/x509/custom/crl_delta_crl_indicator.pem
index 18198361c47ec505ea5a3aa4bdb4fe7229c98bc3_dmVjdG9ycy9jcnlwdG9ncmFwaHlfdmVjdG9ycy94NTA5L2N1c3RvbS9jcmxfZGVsdGFfY3JsX2luZGljYXRvci5wZW0=..26178d7b046af04862530d2e19d3093091b61119_dmVjdG9ycy9jcnlwdG9ncmFwaHlfdmVjdG9ycy94NTA5L2N1c3RvbS9jcmxfZGVsdGFfY3JsX2luZGljYXRvci5wZW0= 100644
--- a/vectors/cryptography_vectors/x509/custom/crl_delta_crl_indicator.pem
+++ b/vectors/cryptography_vectors/x509/custom/crl_delta_crl_indicator.pem
@@ -1,11 +1,11 @@
 -----BEGIN X509 CRL-----
-MIIBfTBnAgEBMA0GCSqGSIb3DQEBCwUAMB0xGzAZBgNVBAMMEmNyeXB0b2dyYXBo
-eS5pbyBDQRcNMDIwMTAxMTIwMTAwWhcNMzAwMTAxMTIwMTAwWqAWMBQwEgYDVR0b
-BAsCCQCrVKmM6x8K0jANBgkqhkiG9w0BAQsFAAOCAQEAUEE3Z8rgIZYo1YK0wZ2X
-bz9NnnE/X1YZQZ/IO/mSsz/k2d5XhLwa53zMlvX7J3UFEjEp+82b+gCMvgpJzTBq
-a/XnifnA8lnFJmPiLB1JgRm2/GsXxkws3ziH5D/6yRdV3MDRQzRg610GayF+LfrF
-74kMns0a1TaOfRhw1APiDvJLngElvcutBS3/mgr+SPPdDgFJ++PSrWOdAw4vo4HH
-TTxduelWWDag2Bg0L90Td8Cdv57jgbCjSwWPSLqfwq674cDxotYABqtLg1Q5jeg2
-GIzEZqYXWvxMc87pQLRwrxG2+U4p+hDpx3TTIn2uyxDTihXvWKmiqzpOiXJKixe5
-Jw==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 -----END X509 CRL-----