diff --git a/flow/connectors/postgres/cdc.go b/flow/connectors/postgres/cdc.go
index 386476192b..ae2b0aba4e 100644
--- a/flow/connectors/postgres/cdc.go
+++ b/flow/connectors/postgres/cdc.go
@@ -245,7 +245,7 @@ func (p *PostgresCDCSource) consumeStream(
 						if err != nil {
 							return nil, fmt.Errorf("error getting pkey column value: %w", err)
 						}
-						pkeyColsMerged = append(pkeyColsMerged, fmt.Sprintf("%v", pkeyColVal))
+						pkeyColsMerged = append(pkeyColsMerged, fmt.Sprintf("%v", pkeyColVal.Value))
 					}
 					tablePkeyVal := model.TableWithPkey{
 						TableName:  tableName,
diff --git a/flow/connectors/postgres/client.go b/flow/connectors/postgres/client.go
index e9eb565840..1c89edf6cf 100644
--- a/flow/connectors/postgres/client.go
+++ b/flow/connectors/postgres/client.go
@@ -566,7 +566,10 @@ func (c *PostgresConnector) generateUpdateStatement(allCols []string, unchangedT
 	updateStmts := make([]string, 0)
 
 	for _, cols := range unchangedToastColsLists {
-		unchangedColsArray := strings.Split(cols, ",")
+		unchangedColsArray := make([]string, 0)
+		for _, unchangedToastCol := range strings.Split(cols, ",") {
+			unchangedColsArray = append(unchangedColsArray, fmt.Sprintf(`"%s"`, unchangedToastCol))
+		}
 		otherCols := utils.ArrayMinus(allCols, unchangedColsArray)
 		tmpArray := make([]string, 0)
 		for _, colName := range otherCols {
diff --git a/flow/e2e/postgres/peer_flow_pg_test.go b/flow/e2e/postgres/peer_flow_pg_test.go
index f2c9bcb18d..14cfef5690 100644
--- a/flow/e2e/postgres/peer_flow_pg_test.go
+++ b/flow/e2e/postgres/peer_flow_pg_test.go
@@ -129,7 +129,7 @@ func (s *PeerFlowE2ETestSuitePG) Test_Simple_Schema_Changes_PG() {
 				"id": string(qvalue.QValueKindInt64),
 				"c1": string(qvalue.QValueKindInt64),
 			},
-			PrimaryKeyColumn: "id",
+			PrimaryKeyColumns: []string{"id"},
 		}
 		output, err := s.connector.GetTableSchema(&protos.GetTableSchemaBatchInput{
 			TableIdentifiers: []string{dstTableName},
@@ -158,7 +158,7 @@ func (s *PeerFlowE2ETestSuitePG) Test_Simple_Schema_Changes_PG() {
 				"c1": string(qvalue.QValueKindInt64),
 				"c2": string(qvalue.QValueKindInt64),
 			},
-			PrimaryKeyColumn: "id",
+			PrimaryKeyColumns: []string{"id"},
 		}
 		output, err = s.connector.GetTableSchema(&protos.GetTableSchemaBatchInput{
 			TableIdentifiers: []string{dstTableName},
@@ -188,7 +188,7 @@ func (s *PeerFlowE2ETestSuitePG) Test_Simple_Schema_Changes_PG() {
 				"c2": string(qvalue.QValueKindInt64),
 				"c3": string(qvalue.QValueKindInt64),
 			},
-			PrimaryKeyColumn: "id",
+			PrimaryKeyColumns: []string{"id"},
 		}
 		output, err = s.connector.GetTableSchema(&protos.GetTableSchemaBatchInput{
 			TableIdentifiers: []string{dstTableName},
@@ -218,7 +218,7 @@ func (s *PeerFlowE2ETestSuitePG) Test_Simple_Schema_Changes_PG() {
 				"c2": string(qvalue.QValueKindInt64),
 				"c3": string(qvalue.QValueKindInt64),
 			},
-			PrimaryKeyColumn: "id",
+			PrimaryKeyColumns: []string{"id"},
 		}
 		output, err = s.connector.GetTableSchema(&protos.GetTableSchemaBatchInput{
 			TableIdentifiers: []string{dstTableName},