diff --git a/cardano-rpc/proto/utxorpc/v1alpha/cardano/cardano.proto b/cardano-rpc/proto/utxorpc/v1alpha/cardano/cardano.proto
index 7a7a5e1bab..d893bc72f0 100644
--- a/cardano-rpc/proto/utxorpc/v1alpha/cardano/cardano.proto
+++ b/cardano-rpc/proto/utxorpc/v1alpha/cardano/cardano.proto
@@ -11,6 +11,11 @@ message TxOutput {
   Script script = 5; // Script associated with the output.
 }
 
+// TODO u5c: new type - https://github.com/utxorpc/spec/pull/167
+message AddressArray {
+  repeated bytes items = 1;
+}
+
 // TODO u5c: replaced plutus_data with just bytes
 message Datum {
   bytes hash = 1; // Hash of this datum as seen on-chain
diff --git a/cardano-rpc/proto/utxorpc/v1alpha/query/query.proto b/cardano-rpc/proto/utxorpc/v1alpha/query/query.proto
index a64c6afdbc..7ecaa10c78 100644
--- a/cardano-rpc/proto/utxorpc/v1alpha/query/query.proto
+++ b/cardano-rpc/proto/utxorpc/v1alpha/query/query.proto
@@ -22,7 +22,7 @@ message TxoRef {
 }
 
 message TxoRefArray {
-  // TODO u5c: changed to repeated
+  // TODO u5c: changed to repeated - https://github.com/utxorpc/spec/pull/167
   repeated TxoRef items = 1;
 }
 
@@ -44,11 +44,6 @@ message ReadParamsResponse {
   ChainPoint ledger_tip = 2; // The chain point that represent the ledger current position.
 }
 
-// TODO u5c: new type
-message AddressArray {
-  repeated bytes items = 1;
-}
-
 // An evenlope that holds an UTxO from any of compatible chains
 message AnyUtxoData {
   bytes native_bytes = 1; // Original bytes as defined by the chain
@@ -60,10 +55,10 @@ message AnyUtxoData {
 
 // Request to get specific UTxOs
 message ReadUtxosRequest {
-  // TODO u5c: new oneof
+  // TODO u5c: new oneof - https://github.com/utxorpc/spec/pull/167
   oneof query_args {
     TxoRefArray txoRefs = 1; // Array of Tx Output references
-    AddressArray addresses = 2; // Array of addresses
+    utxorpc.v1alpha.cardano.AddressArray cardano_addresses = 2; // Array of addresses
   }
   google.protobuf.FieldMask field_mask = 3; // Field mask to selectively return fields.
 }
diff --git a/cardano-rpc/proto/utxorpc/v1alpha/submit/submit.proto b/cardano-rpc/proto/utxorpc/v1alpha/submit/submit.proto
index b9ceb10163..2730908c55 100644
--- a/cardano-rpc/proto/utxorpc/v1alpha/submit/submit.proto
+++ b/cardano-rpc/proto/utxorpc/v1alpha/submit/submit.proto
@@ -14,7 +14,7 @@ message SubmitTxRequest {
   repeated AnyChainTx tx = 1; // List of transactions to submit.
 }
 
-// TODO u5c: new type
+// TODO u5c: new type - https://github.com/utxorpc/spec/pull/163
 message TxSubmitResult {
   oneof result {
     bytes ref = 1; // Transaction references.
@@ -23,7 +23,7 @@ message TxSubmitResult {
 }
 
 // Response containing references to the submitted transactions.
-// TODO u5c: changed type
+// TODO u5c: changed type - https://github.com/utxorpc/spec/pull/163
 message SubmitTxResponse {
   repeated TxSubmitResult results = 1; // List of either transaction references or error messages.
 }
diff --git a/cardano-rpc/src/Cardano/Rpc/Proto/Api/UtxoRpc/Query.hs b/cardano-rpc/src/Cardano/Rpc/Proto/Api/UtxoRpc/Query.hs
index c4c6d12779..3a53b2adb8 100644
--- a/cardano-rpc/src/Cardano/Rpc/Proto/Api/UtxoRpc/Query.hs
+++ b/cardano-rpc/src/Cardano/Rpc/Proto/Api/UtxoRpc/Query.hs
@@ -15,7 +15,9 @@ import Network.GRPC.Common.Protobuf
 import Proto.Utxorpc.V1alpha.Cardano.Cardano
 import Proto.Utxorpc.V1alpha.Cardano.Cardano_Fields hiding
   ( hash
+  , items
   , values
+  , vec'items
   , vec'values
   )
 import Proto.Utxorpc.V1alpha.Query.Query
diff --git a/cardano-rpc/src/Cardano/Rpc/Server/Internal/UtxoRpc/Query.hs b/cardano-rpc/src/Cardano/Rpc/Server/Internal/UtxoRpc/Query.hs
index 646ddd999e..c046fa40ab 100644
--- a/cardano-rpc/src/Cardano/Rpc/Server/Internal/UtxoRpc/Query.hs
+++ b/cardano-rpc/src/Cardano/Rpc/Server/Internal/UtxoRpc/Query.hs
@@ -65,7 +65,7 @@ readUtxosMethod req = do
     if
       | Just txoRefs <- req ^. #maybe'txoRefs ->
           QueryUTxOByTxIn . fromList <$> mapM txoRefToTxIn (txoRefs ^. #items)
-      | Just addressesProto <- req ^. #maybe'addresses ->
+      | Just addressesProto <- req ^. #maybe'cardanoAddresses ->
           QueryUTxOByAddress . fromList <$> mapM readAddress (addressesProto ^. #items)
       | otherwise -> pure QueryUTxOWhole