diff --git a/lineage_notes.txt b/lineage_notes.txt
index 56d8c6b2..b8dbfefd 100644
--- a/lineage_notes.txt
+++ b/lineage_notes.txt
@@ -2694,6 +2694,7 @@ XBB.1.29	Defined by ORF1a:L3829F, S:A292S, Europe
 XBB.1.30	Defined by ORF1b:K2557R, South East Asia
 XBB.1.31	Defined by S:453F and S:478R, Indonesia/Singapore
 XBB.1.32	Defined by ORF1a:E148D, Philippines
+XBB.1.33	Defined by S:A376T, found mainly in Italy, from pango-designation issue #1879
 XBB.2	Defined by S:D253G, from issue #1173
 XBB.2.1	Defined by S:N764R (C23853G), two step mutation on top of C23854A (S:N764K defining of all Omicrons)
 XBB.2.2	Defined by S:Q613H
diff --git a/lineages.csv b/lineages.csv
index 6bc9a938..05ecb2d7 100644
--- a/lineages.csv
+++ b/lineages.csv
@@ -2365100,3 +2365100,21 @@ Sweden/3285441964/2023,FQ.1
 Sweden/Orebro-21693212/2023,FQ.1
 Sweden/14_SE300_DC-004011/2023,FQ.1
 Switzerland/BL-UHB-USB-d664edbf/2023,FQ.1
+South Korea/KDCA223074/2023,XBB.1.33
+Italy/VEN-IZSVe-23RS8089-6_RO/2023,XBB.1.33
+Italy/CAM-TIGEM-IZSM-COLLI-46404/2023,XBB.1.33
+France/HDF-IPP08225/2023,XBB.1.33
+France/NAQ-HCL723000410101/2023,XBB.1.33
+Italy/UMB-LAOP-114-2-25/2023,XBB.1.33
+Italy/UMB-LAOP-114-2-21/2023,XBB.1.33
+Italy/APU-IZSPB-PT7917/2023,XBB.1.33
+Italy/CAM-TIGEM-IZSM-COLLI-46510/2023,XBB.1.33
+Italy/CAM-TIGEM-IZSM-COLLI-46515/2023,XBB.1.33
+Italy/CAM-TIGEM-IZSM-COLLI-46534/2023,XBB.1.33
+Italy/CAM-TIGEM-IZSM-COLLI-46506/2023,XBB.1.33
+Italy/CAM-TIGEM-IZSM-COLLI-46507/2023,XBB.1.33
+Italy/CAM-TIGEM-IZSM-COLLI-46524/2023,XBB.1.33
+Italy/CAM-TIGEM-IZSM-COLLI-46503/2023,XBB.1.33
+Italy/CAM_TA-0011191093_IZSM_COLLI_TIGEM/2023,XBB.1.33
+Italy/CAM_20230310189_IZSM_COLLI_TIGEM/2023,XBB.1.33
+France/NOR-CHURouen-30935820/2023,XBB.1.33