diff --git a/cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh b/cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh
index c5218549ad..e6d47393fd 100644
--- a/cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh
+++ b/cpp/include/raft/neighbors/detail/ivf_flat_serialize.cuh
@@ -29,12 +29,12 @@
 
 namespace raft::neighbors::ivf_flat::detail {
 
-// Serialization version 3
+// Serialization version
 // No backward compatibility yet; that is, can't add additional fields without breaking
 // backward compatibility.
 // TODO(hcho3) Implement next-gen serializer for IVF that allows for expansion in a backward
 //             compatible fashion.
-constexpr int serialization_version = 4;
+constexpr int serialization_version = 5;
 
 // NB: we wrap this check in a struct, so that the updated RealSize is easy to see in the error
 // message.
diff --git a/cpp/include/raft/neighbors/detail/ivf_pq_serialize.cuh b/cpp/include/raft/neighbors/detail/ivf_pq_serialize.cuh
index 0012ac18f9..34446a98e4 100644
--- a/cpp/include/raft/neighbors/detail/ivf_pq_serialize.cuh
+++ b/cpp/include/raft/neighbors/detail/ivf_pq_serialize.cuh
@@ -36,7 +36,7 @@ namespace raft::neighbors::ivf_pq::detail {
 // backward compatibility.
 // TODO(hcho3) Implement next-gen serializer for IVF that allows for expansion in a backward
 //             compatible fashion.
-constexpr int kSerializationVersion = 3;
+constexpr int kSerializationVersion = 4;
 
 // NB: we wrap this check in a struct, so that the updated RealSize is easy to see in the error
 // message.