diff --git a/nextstrain_profiles/nextstrain-gisaid-21L/builds.yaml b/nextstrain_profiles/nextstrain-gisaid-21L/builds.yaml
index 24519a426..bc7e8b5be 100644
--- a/nextstrain_profiles/nextstrain-gisaid-21L/builds.yaml
+++ b/nextstrain_profiles/nextstrain-gisaid-21L/builds.yaml
@@ -313,25 +313,25 @@ subsampling:
       exclude: "--exclude-where 'region=Asia'"
     # Recent focal samples for Asia
     asia_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 1200
       min_date: "--min-date 1M"
       exclude: "--exclude-where 'region!=Asia' 'country=China' 'country=India'"
     # Recent focal samples for China
     china_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 1M"
       exclude: "--exclude-where 'country!=China'"
     # Recent focal samples for India
     india_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 1M"
       exclude: "--exclude-where 'country!=India'"
     # Early contextual samples from the rest of the world
     context_recent:
-      group_by: "country year month"
+      group_by: "country week"
       max_sequences: 700
       min_date: "--min-date 1M"
       exclude: "--exclude-where 'region=Asia'"
@@ -370,25 +370,25 @@ subsampling:
       exclude: "--exclude-where 'region=Asia'"
     # Recent focal samples for Asia
     asia_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 1200
       min_date: "--min-date 2M"
       exclude: "--exclude-where 'region!=Asia' 'country=China' 'country=India'"
     # Recent focal samples for China
     china_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 2M"
       exclude: "--exclude-where 'country!=China'"
     # Recent focal samples for India
     india_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 2M"
       exclude: "--exclude-where 'country!=India'"
     # Early contextual samples from the rest of the world
     context_recent:
-      group_by: "country year month"
+      group_by: "country week"
       max_sequences: 700
       min_date: "--min-date 2M"
       exclude: "--exclude-where 'region=Asia'"
diff --git a/nextstrain_profiles/nextstrain-gisaid/builds.yaml b/nextstrain_profiles/nextstrain-gisaid/builds.yaml
index dfd006a28..4034e4730 100644
--- a/nextstrain_profiles/nextstrain-gisaid/builds.yaml
+++ b/nextstrain_profiles/nextstrain-gisaid/builds.yaml
@@ -305,25 +305,25 @@ subsampling:
       exclude: "--exclude-where 'region=Asia'"
     # Recent focal samples for Asia
     asia_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 1200
       min_date: "--min-date 1M"
       exclude: "--exclude-where 'region!=Asia' 'country=China' 'country=India'"
     # Recent focal samples for China
     china_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 1M"
       exclude: "--exclude-where 'country!=China'"
     # Recent focal samples for India
     india_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 1M"
       exclude: "--exclude-where 'country!=India'"
     # Early contextual samples from the rest of the world
     context_recent:
-      group_by: "country year month"
+      group_by: "country week"
       max_sequences: 700
       min_date: "--min-date 1M"
       exclude: "--exclude-where 'region=Asia'"
@@ -362,25 +362,25 @@ subsampling:
       exclude: "--exclude-where 'region=Asia'"
     # Recent focal samples for Asia
     asia_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 1200
       min_date: "--min-date 2M"
       exclude: "--exclude-where 'region!=Asia' 'country=China' 'country=India'"
     # Recent focal samples for China
     china_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 2M"
       exclude: "--exclude-where 'country!=China'"
     # Recent focal samples for India
     india_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 2M"
       exclude: "--exclude-where 'country!=India'"
     # Early contextual samples from the rest of the world
     context_recent:
-      group_by: "country year month"
+      group_by: "country week"
       max_sequences: 700
       min_date: "--min-date 2M"
       exclude: "--exclude-where 'region=Asia'"
diff --git a/nextstrain_profiles/nextstrain-open/builds.yaml b/nextstrain_profiles/nextstrain-open/builds.yaml
index aa26e0101..40d5ff3ee 100644
--- a/nextstrain_profiles/nextstrain-open/builds.yaml
+++ b/nextstrain_profiles/nextstrain-open/builds.yaml
@@ -305,25 +305,25 @@ subsampling:
       exclude: "--exclude-where 'region=Asia'"
     # Recent focal samples for Asia
     asia_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 1200
       min_date: "--min-date 1M"
       exclude: "--exclude-where 'region!=Asia' 'country=China' 'country=India'"
     # Recent focal samples for China
     china_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 1M"
       exclude: "--exclude-where 'country!=China'"
     # Recent focal samples for India
     india_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 1M"
       exclude: "--exclude-where 'country!=India'"
     # Early contextual samples from the rest of the world
     context_recent:
-      group_by: "country year month"
+      group_by: "country week"
       max_sequences: 700
       min_date: "--min-date 1M"
       exclude: "--exclude-where 'region=Asia'"
@@ -362,25 +362,25 @@ subsampling:
       exclude: "--exclude-where 'region=Asia'"
     # Recent focal samples for Asia
     asia_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 1200
       min_date: "--min-date 2M"
       exclude: "--exclude-where 'region!=Asia' 'country=China' 'country=India'"
     # Recent focal samples for China
     china_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 2M"
       exclude: "--exclude-where 'country!=China'"
     # Recent focal samples for India
     india_recent:
-      group_by: "division year month"
+      group_by: "division week"
       max_sequences: 800
       max_date: "--min-date 2M"
       exclude: "--exclude-where 'country!=India'"
     # Early contextual samples from the rest of the world
     context_recent:
-      group_by: "country year month"
+      group_by: "country week"
       max_sequences: 700
       min_date: "--min-date 2M"
       exclude: "--exclude-where 'region=Asia'"