diff --git a/lineage_notes.txt b/lineage_notes.txt
index 38ff285b..3cd9fc11 100644
--- a/lineage_notes.txt
+++ b/lineage_notes.txt
@@ -2923,6 +2923,7 @@ GY.1	Alias of XBB.1.16.2.1, S:L84I, ORF1a:A4068S, China, from #2066
 GY.2	Alias of XBB.1.16.2.2, S:T883I
 GY.2.1	Alias of XBB.1.16.2.2.1, S:S255F, South Korea
 GY.3	Alias of XBB.1.16.2.3, S:M177I, Thailand
+GY.4	Alias of XBB.1.16.2.4, S:N450K, C29095T, Laos
 XBB.1.16.3	Defined by A2893C, India
 XBB.1.16.4	Defined by S:T678I, India, from #1903
 XBB.1.16.5	Defined by T9991C,C16332T, India, from #1983
diff --git a/lineages.csv b/lineages.csv
index a243c4ae..65173266 100644
--- a/lineages.csv
+++ b/lineages.csv
@@ -2443118,3 +2443118,12 @@ Argentina/92092-16/2023,XBB.1.12.1
 France/OCC-CHU-TLS-6003896438/2023,XBB.1.12.1
 Scotland/SCOT-31516/2023,XBB.1.12.1
 CanaryIslands/HUGCDN-04202076/2023,XBB.1.12.1
+Laos/IPL-78101/2023,GY.4
+Laos/IPL-78100/2023,GY.4
+Laos/IPL-78036/2023,GY.4
+Japan/PG-528085/2023,GY.4
+Singapore/R39MR94/2023,GY.4
+Laos/IPL-78114/2023,GY.4
+CHN/YNCDC-1542/2023,GY.4
+Laos/IPL-78106/2023,GY.4
+Laos/IPL-78044/2023,GY.4