diff --git a/explorer/src/api/graphql/certificates.rs b/explorer/src/api/graphql/certificates.rs
index c9deecd29b..b8a19be3f1 100644
--- a/explorer/src/api/graphql/certificates.rs
+++ b/explorer/src/api/graphql/certificates.rs
@@ -262,6 +262,8 @@ impl TryFrom<chain_impl_mockchain::certificate::Certificate> for Certificate {
             certificate::Certificate::EncryptedVoteTally(c) => {
                 Ok(Certificate::EncryptedVoteTally(EncryptedVoteTally(c)))
             }
+            certificate::Certificate::UpdateProposal(c) => todo!("port this from jormungandr"),
+            certificate::Certificate::UpdateVote(c) => todo!("port this from jormungandr"),
         }
     }
 }