diff --git a/lineage_notes.txt b/lineage_notes.txt
index b90981da..d72ae650 100644
--- a/lineage_notes.txt
+++ b/lineage_notes.txt
@@ -2841,6 +2841,7 @@ XBB.2.6	Mostly Peru, C5144T, T5731A
 XBB.2.7	ORF1a:R3662H, parent of lineage proposed in #1725
 XBB.2.7.1	S:Y453F, S:K478Q, Singapore, #1725
 XBB.2.8	C6968T, Brunei
+XBB.2.9	Defined by ORF1a:V2027I and S:F486P, found mainly in Russia, from pango-designation issue #1877
 XBB.3	Defined by ORF1b:I1988V on ORF1a:D82G branch
 XBB.3.1	Defined by S:Q677R, India-TN/Singapore, from issue #1241
 XBB.3.2	Defined by S:M177T
diff --git a/lineages.csv b/lineages.csv
index 2dd28b8f..4d930db7 100644
--- a/lineages.csv
+++ b/lineages.csv
@@ -2277878,7 +2277878,7 @@ USA/CA-CDC-STM-CFPRWFU8M/2022,XBB.2
 Germany/HH-hpi-p18842/2022,XBB.2
 Germany/NW-RKI-I-1066196/2022,XBB.2
 Denmark/DCGC-635893/2023,XBB.2
-Singapore/R13MR86/2023,XBB.2
+Singapore/R13MR86/2023,XBB.2.9
 Brunei/7722018568/2022,XBB.2
 Indonesia/KB-FKUNTAN-WGS-17071/2022,XBB.2
 USA/CA-HLX-STM-ANNWHWJCS/2022,XBB.2
@@ -2277909,7 +2277909,7 @@ USA/TX-HMH-MCoV-123559/2023,XBB.2
 India/GJ-GBRC9828/2022,XBB.2
 Denmark/DCGC-610969/2022,XBB.2
 Australia/TAS004421/2022,XBB.2
-Singapore/R10MR92/2023,XBB.2
+Singapore/R10MR92/2023,XBB.2.9
 USA/NJ-CDC-QDX45592851/2023,XBB.2
 USA/WA-UW-22111402207/2022,XBB.2
 England/BRBR-32671C16/2022,XBB.2
@@ -2278208,7 +2278208,7 @@ England/PHEC-YY8Q5GS/2022,XBB.2
 USA/CA-CDC-LC0945108/2022,XBB.2
 England/PHEC-YY8QA6E/2022,XBB.2
 USA/FL-BPHL-15739/2022,XBB.2
-Russia/MOW-RII-MH127718S/2023,XBB.2
+Russia/MOW-RII-MH127718S/2023,XBB.2.9
 USA/AZ-CDC-STM-E32X4Z6QJ/2022,XBB.2
 Australia/NSW-ICPMR-37583/2022,XBB.2
 India/GJ-GBRC9155/2022,XBB.2
@@ -2278572,7 +2278572,7 @@ Brunei/7722017214/2022,XBB.2
 Brunei/7722019393/2022,XBB.2
 England/PHEC-YY8ORYW/2022,XBB.2
 Russia/MOW-RII-MH126002S/2022,XBB.2
-Russia/MOW-RII-MH126466S/2023,XBB.2
+Russia/MOW-RII-MH126466S/2023,XBB.2.9
 Russia/MOW-CRIE-7785770636/2022,XBB.2
 Germany/HH-RKI-I-1069064/2022,XBB.2
 USA/CA-CDC-STM-VK6U6F4ZY/2022,XBB.2
@@ -2279116,7 +2279116,7 @@ Denmark/DCGC-607433/2022,XBB.2
 USA/NY-CDC-LC0969488/2022,XBB.2
 USA/AZ-ASC-210989280/2022,XBB.2
 USA/CA-UCSF-JD2899/2022,XBB.2
-Russia/MOW-RII-MH127960S/2023,XBB.2
+Russia/MOW-RII-MH127960S/2023,XBB.2.9
 India/KA-SLS-49114/2022,XBB.2
 USA/NY-CDC-LC0978126/2022,XBB.2
 USA/GA-CDC-QDX45591867/2023,XBB.2
@@ -2279204,7 +2279204,7 @@ India/KA-BMCRI-1140/2023,XBB.2
 Ireland/CO-Enfer-090123002_B9/2023,XBB.2
 USA/NY-PRL-221207_01A11/2022,XBB.2
 Japan/TKYmbc14086/2022,XBB.2
-Russia/MOW-RII-MH127708S/2023,XBB.2
+Russia/MOW-RII-MH127708S/2023,XBB.2.9
 Luxembourg/LNS5029310/2023,XBB.2
 England/PHEP-YYGB73E/2022,XBB.2
 Germany/NI-RKI-I-1060382/2022,XBB.2
@@ -2406762,3 +2406762,43 @@ Canada/ON-KHS-23-02811-v1/2023,XBB.1.5.64
 USA/CA-CDC-QDX47771787/2023,XBB.1.5.64
 USA/CA-CDC-QDX47771727/2023,XBB.1.5.64
 USA/CA-CDPH-500109193/2023,XBB.1.5.64
+Russia/MOW-RII-MH130361S/2023,XBB.2.9
+Russia/MOW-RII-MH127720S/2023,XBB.2.9
+Russia/MO-RII-MH129854S/2023,XBB.2.9
+Russia/BRY-RII-MH128497S/2023,XBB.2.9
+Russia/MOW-RII-MH129391S/2023,XBB.2.9
+Germany/BE-RKI-I-1124149/2023,XBB.2.9
+Russia/MOW-RII-MH130320S/2023,XBB.2.9
+Russia/MOW-RII-MH130342S/2023,XBB.2.9
+Singapore/R9MR65/2023,XBB.2.9
+Russia/MOW-RII-MH129377S/2023,XBB.2.9
+Russia/MOW-RII-MH129185S/2023,XBB.2.9
+Russia/MOW-RII-MH130080S/2023,XBB.2.9
+Russia/MOW-RII-MH128341S/2022,XBB.2.9
+Thailand/NIC_BKK_1070/2023,XBB.2.9
+Russia/MOW-RII-MH128970S/2023,XBB.2.9
+Russia/MOW-RII-MH129236S/2023,XBB.2.9
+Russia/VLA-RII-MH130030S/2023,XBB.2.9
+Russia/MOW-RII-MH129378S/2023,XBB.2.9
+Russia/MOW-RII-MH128221S/2023,XBB.2.9
+Russia/MOW-RII-MH130272S/2023,XBB.2.9
+Russia/OMS-RII-MH130486S/2023,XBB.2.9
+Russia/MOW-PMVL-OM0223O369/2023,XBB.2.9
+Russia/PNZ-1298/2022,XBB.2.9
+Russia/MOW-RII-MH128287S/2023,XBB.2.9
+Austria/AGES-1132977/2023,XBB.2.9
+Russia/MOW-PMVL-OM0223O533/2023,XBB.2.9
+Germany/RP-RKI-I-1128187/2023,XBB.2.9
+Russia/MOW-RII-MH127559S/2023,XBB.2.9
+Russia/MO-RII-MH129817S/2023,XBB.2.9
+Russia/SPE-RII-12768S/2023,XBB.2.9
+Russia/MOW-PMVL-OM0223O363/2023,XBB.2.9
+Russia/OMS-RII-MH130477S/2023,XBB.2.9
+Russia/MOW-RII-MH128179S/2023,XBB.2.9
+Thailand/NIC_BKK_1064/2023,XBB.2.9
+Russia/MOW-RII-MH130146S/2023,XBB.2.9
+Russia/MOW-RII-MH128963S/2023,XBB.2.9
+Russia/OMS-RII-MH130460S/2023,XBB.2.9
+Israel/SMC-7111857/2023,XBB.2.9
+Russia/MOW-RII-MH127643S/2023,XBB.2.9
+Russia/MOW-RII-MH126320S/2023,XBB.2.9