diff --git a/tests/official/test_fixture_ssz_consensus_objects.nim b/tests/official/test_fixture_ssz_consensus_objects.nim
index e05e5b4b3..69e1fd330 100644
--- a/tests/official/test_fixture_ssz_consensus_objects.nim
+++ b/tests/official/test_fixture_ssz_consensus_objects.nim
@@ -94,9 +94,9 @@ proc runSSZtests() =
           of "AggregateAndProof": checkSSZ(AggregateAndProof, path, hash)
           of "Attestation": checkSSZ(Attestation[Unchecked], path, hash)
           of "AttestationData": checkSSZ(AttestationData, path, hash)
-          of "AttesterSlashing": checkSSZ(AttesterSlashing, path, hash)
-          of "BeaconBlock": checkSSZ(BeaconBlock, path, hash)
-          of "BeaconBlockBody": checkSSZ(BeaconBlockBody, path, hash)
+          of "AttesterSlashing": checkSSZ(AttesterSlashing[Unchecked], path, hash)
+          of "BeaconBlock": checkSSZ(BeaconBlock[Unchecked], path, hash)
+          of "BeaconBlockBody": checkSSZ(BeaconBlockBody[Unchecked], path, hash)
           of "BeaconBlockHeader": checkSSZ(BeaconBlockHeader, path, hash)
           of "BeaconState": checkSSZ(BeaconState, path, hash)
           of "Checkpoint": checkSSZ(Checkpoint, path, hash)
@@ -108,12 +108,12 @@ proc runSSZtests() =
           of "Fork": checkSSZ(Fork, path, hash)
           of "ForkData": checkSSZ(ForkData, path, hash)
           of "HistoricalBatch": checkSSZ(HistoricalBatch, path, hash)
-          of "IndexedAttestation": checkSSZ(IndexedAttestation, path, hash)
+          of "IndexedAttestation": checkSSZ(IndexedAttestation[Unchecked], path, hash)
           of "PendingAttestation": checkSSZ(PendingAttestation, path, hash)
           of "ProposerSlashing": checkSSZ(ProposerSlashing, path, hash)
           of "SignedAggregateAndProof":
             checkSSZ(SignedAggregateAndProof, path, hash)
-          of "SignedBeaconBlock": checkSSZ(SignedBeaconBlock, path, hash)
+          of "SignedBeaconBlock": checkSSZ(SignedBeaconBlock[Unchecked], path, hash)
           of "SignedBeaconBlockHeader":
             checkSSZ(SignedBeaconBlockHeader, path, hash)
           of "SignedVoluntaryExit": checkSSZ(SignedVoluntaryExit, path, hash)
diff --git a/vendor/nim-serialization b/vendor/nim-serialization
index 5b11c4173..dfd6e349a 160000
--- a/vendor/nim-serialization
+++ b/vendor/nim-serialization
@@ -1 +1 @@
-Subproject commit 5b11c4173159a15d52f0bb6a26a1aa2b40f0f2be
+Subproject commit dfd6e349a62417b7951f17a0afea89a0c11d5ebc