diff --git a/data/nextstrain/flu/h1n1pdm/ha/CY121680/CHANGELOG.md b/data/nextstrain/flu/h1n1pdm/ha/CY121680/CHANGELOG.md
index 5da5bb92..8c5305ff 100644
--- a/data/nextstrain/flu/h1n1pdm/ha/CY121680/CHANGELOG.md
+++ b/data/nextstrain/flu/h1n1pdm/ha/CY121680/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## Unreleased
- - include subclade proposals for C.1.9.a/b/c
+
+ - add subclade proposals C.1.9.a/b/c/d
 
 ## 2024-11-27T02:51:00Z
 
diff --git a/data/nextstrain/flu/h1n1pdm/ha/CY121680/tree.json b/data/nextstrain/flu/h1n1pdm/ha/CY121680/tree.json
index 69c25c55..eb8dddbc 100644
--- a/data/nextstrain/flu/h1n1pdm/ha/CY121680/tree.json
+++ b/data/nextstrain/flu/h1n1pdm/ha/CY121680/tree.json
@@ -1 +1 @@
-{"version": "v2", "meta": {"title": "Nextclade reference tree for Influenza type:h1n1pdm segment:ha with root CY121680 built on 2024-12-14", "updated": "2024-12-14", "build_url": "https://github.com/nextstrain/seasonal-flu", "data_provenance": [{"name": "GISAID"}], "maintainers": [{"name": "Nextstrain team", "url": "https://nextstrain.org"}], "display_defaults": {"color_by": "subclade", "distance_measure": "div", "branch_label": "subclade"}, "genome_annotations": {"HA1": {"end": 1052, "seqid": "dataset_config/h1n1pdm/ha/CY121680/annotation.gff", "start": 72, "strand": "+", "type": "gene"}, "HA2": {"end": 1718, "seqid": "dataset_config/h1n1pdm/ha/CY121680/annotation.gff", "start": 1053, "strand": "+", "type": "gene"}, "SigPep": {"end": 71, "seqid": "dataset_config/h1n1pdm/ha/CY121680/annotation.gff", "start": 21, "strand": "+", "type": "gene"}, "nuc": {"end": 1752, "start": 1, "strand": "+", "type": "source"}}, "colorings": [{"key": "clade_membership", "title": "Clade", "type": "categorical"}, {"key": "gt", "title": "Genotype", "type": "categorical"}, {"key": "subclade", "title": "Subclade", "type": "categorical"}, {"key": "short-clade", "title": "short-clade", "type": "categorical"}, {"key": "proposedSubclade", "title": "Subclade proposals", "type": "categorical"}, {"key": "strain", "title": "strain", "type": "categorical"}, {"key": "region", "title": "Region", "type": "categorical", "scale": [["China", "#4042C7"], ["Southeast Asia", "#4274CE"], ["South Asia", "#5199B7"], ["Japan Korea", "#69B091"], ["Oceania", "#88BB6C"], ["West Asia", "#ADBD51"], ["Africa", "#CEB541"], ["Europe", "#E39B39"], ["South America", "#E56C2F"], ["North America", "#DC2F24"]]}, {"key": "country", "title": "Country", "type": "categorical"}, {"key": "date", "title": "Sample Date", "type": "ordinal"}, {"key": "gisaid_epi_isl", "title": "gisaid_epi_isl", "type": "categorical"}, {"key": "accession_ha", "title": "accession_ha", "type": "categorical"}], "filters": ["region", "country", "clade_membership", "subclade"], "panels": ["tree", "entropy"], "extensions": {"nextclade": {"clade_node_attrs": [{"name": "short-clade", "displayName": "short-clade", "description": ""}, {"name": "subclade", "displayName": "Subclade", "description": "Experimental fine-grained subclade annotation."}, {"name": "proposedSubclade", "displayName": "Proposed subclade", "description": "Includes proposals of new subclades. 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\ No newline at end of file
diff --git a/data/nextstrain/flu/h1n1pdm/ha/MW626062/CHANGELOG.md b/data/nextstrain/flu/h1n1pdm/ha/MW626062/CHANGELOG.md
index 0693cc01..054a276f 100644
--- a/data/nextstrain/flu/h1n1pdm/ha/MW626062/CHANGELOG.md
+++ b/data/nextstrain/flu/h1n1pdm/ha/MW626062/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## Unreleased
- - include subclade proposals for C.1.9.a/b/c
+
+ - add subclade proposals C.1.9.a/b/c/d
 
 ## 2024-11-27T02:51:00Z
 
diff --git a/data/nextstrain/flu/h1n1pdm/ha/MW626062/tree.json b/data/nextstrain/flu/h1n1pdm/ha/MW626062/tree.json
index 75543582..25b645cd 100644
--- a/data/nextstrain/flu/h1n1pdm/ha/MW626062/tree.json
+++ b/data/nextstrain/flu/h1n1pdm/ha/MW626062/tree.json
@@ -1 +1 @@
-{"version": "v2", "meta": {"title": "Nextclade reference tree for Influenza type:h1n1pdm segment:ha with root MW626062 built on 2024-12-14", "updated": "2024-12-14", "build_url": "https://github.com/nextstrain/seasonal-flu", "data_provenance": [{"name": "GISAID"}], "maintainers": [{"name": "Nextstrain team", "url": "https://nextstrain.org"}], "display_defaults": {"color_by": "subclade", "distance_measure": "div", "branch_label": "subclade"}, "genome_annotations": {"HA1": {"end": 1052, "seqid": "dataset_config/h1n1pdm/ha/MW626062/annotation.gff", "start": 72, "strand": "+", "type": "gene"}, "HA2": {"end": 1718, "seqid": "dataset_config/h1n1pdm/ha/MW626062/annotation.gff", "start": 1053, "strand": "+", "type": "gene"}, "SigPep": {"end": 71, "seqid": "dataset_config/h1n1pdm/ha/MW626062/annotation.gff", "start": 21, "strand": "+", "type": "gene"}, "nuc": {"end": 1752, "start": 1, "strand": "+", "type": "source"}}, "colorings": [{"key": "clade_membership", "title": "Clade", "type": "categorical"}, {"key": "gt", "title": "Genotype", "type": "categorical"}, {"key": "short-clade", "title": "short-clade", "type": "categorical"}, {"key": "proposedSubclade", "title": "Subclade proposals", "type": "categorical"}, {"key": "subclade", "title": "Subclade", "type": "categorical"}, {"key": "strain", "title": "strain", "type": "categorical"}, {"key": "region", "title": "Region", "type": "categorical", "scale": [["China", "#4042C7"], ["Southeast Asia", "#4274CE"], ["South Asia", "#5199B7"], ["Japan Korea", "#69B091"], ["Oceania", "#88BB6C"], ["West Asia", "#ADBD51"], ["Africa", "#CEB541"], ["Europe", "#E39B39"], ["South America", "#E56C2F"], ["North America", "#DC2F24"]]}, {"key": "country", "title": "Country", "type": "categorical"}, {"key": "date", "title": "Sample Date", "type": "ordinal"}, {"key": "gisaid_epi_isl", "title": "gisaid_epi_isl", "type": "categorical"}, {"key": "accession_ha", "title": "accession_ha", "type": "categorical"}], "filters": ["region", "country", "clade_membership", "subclade"], "panels": ["tree", "entropy"], "extensions": {"nextclade": {"clade_node_attrs": [{"name": "short-clade", "displayName": "short-clade", "description": ""}, {"name": "subclade", "displayName": "Subclade", "description": "Experimental fine-grained subclade annotation."}, {"name": "proposedSubclade", "displayName": "Proposed subclade", "description": "Includes proposals of new subclades. 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