diff --git a/scripts/issue-milestone-collector/README.md b/scripts/issue-milestone-collector/README.md
index 1f1efece..b2601173 100644
--- a/scripts/issue-milestone-collector/README.md
+++ b/scripts/issue-milestone-collector/README.md
@@ -339,6 +339,7 @@ PANGO | UNALIASED PANGO | MILESTONE | ISSUE | LABELS | REPO
 `JN.1.6.1` | `B.1.1.529.2.86.1.1.6.1` | [⚑ 425](https://github.com/sars-cov-2-variants/lineage-proposals/milestone/425?closed=1) | [#1089 🔵](https://github.com/sars-cov-2-variants/lineage-proposals/issues/1089) | [Multiple lineages](https://github.com/sars-cov-2-variants/lineage-proposals/labels/Multiple%20lineages), [S:346](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A346), [partially designated](https://github.com/sars-cov-2-variants/lineage-proposals/labels/partially%20designated), [JN.1](https://github.com/sars-cov-2-variants/lineage-proposals/labels/JN%2E1), [FLiRT](https://github.com/sars-cov-2-variants/lineage-proposals/labels/FLiRT) | 2nd
 `JN.1.7` | `B.1.1.529.2.86.1.1.7` | [⚑ 389](https://github.com/sars-cov-2-variants/lineage-proposals/milestone/389?closed=1) | [#1097 🟠](https://github.com/sars-cov-2-variants/lineage-proposals/issues/1097) | [To be proposed](https://github.com/sars-cov-2-variants/lineage-proposals/labels/To%20be%20proposed), [Multiple lineages](https://github.com/sars-cov-2-variants/lineage-proposals/labels/Multiple%20lineages), [partially designated](https://github.com/sars-cov-2-variants/lineage-proposals/labels/partially%20designated), [BA.2.86](https://github.com/sars-cov-2-variants/lineage-proposals/labels/BA%2E2%2E86), [S:572](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A572), [JN.1](https://github.com/sars-cov-2-variants/lineage-proposals/labels/JN%2E1) | 2nd
 `JN.1.7.1` | `B.1.1.529.2.86.1.1.7.1` | [⚑ 420](https://github.com/sars-cov-2-variants/lineage-proposals/milestone/420?closed=1) | [#1371](https://github.com/sars-cov-2-variants/lineage-proposals/issues/1371) | [designated](https://github.com/sars-cov-2-variants/lineage-proposals/labels/designated), [S:346](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A346), [S:572](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A572), [JN.1](https://github.com/sars-cov-2-variants/lineage-proposals/labels/JN%2E1) | 2nd
+`JN.1.7.3` | `B.1.1.529.2.86.1.1.7.3` | [⚑ 452](https://github.com/sars-cov-2-variants/lineage-proposals/milestone/452?closed=1) | [#1343 🔴](https://github.com/sars-cov-2-variants/lineage-proposals/issues/1343) | [S:346](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A346), [S:455](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A455), [S:572](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A572), [JN.1](https://github.com/sars-cov-2-variants/lineage-proposals/labels/JN%2E1), [S:680](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A680) | 2nd
 `JN.1.8.1` | `B.1.1.529.2.86.1.1.8.1` | [⚑ 389](https://github.com/sars-cov-2-variants/lineage-proposals/milestone/389?closed=1) | [#1097 🟠](https://github.com/sars-cov-2-variants/lineage-proposals/issues/1097) | [To be proposed](https://github.com/sars-cov-2-variants/lineage-proposals/labels/To%20be%20proposed), [Multiple lineages](https://github.com/sars-cov-2-variants/lineage-proposals/labels/Multiple%20lineages), [partially designated](https://github.com/sars-cov-2-variants/lineage-proposals/labels/partially%20designated), [BA.2.86](https://github.com/sars-cov-2-variants/lineage-proposals/labels/BA%2E2%2E86), [S:572](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A572), [JN.1](https://github.com/sars-cov-2-variants/lineage-proposals/labels/JN%2E1) | 2nd
 `JN.1.8.2` | `B.1.1.529.2.86.1.1.8.2` | [⚑ 425](https://github.com/sars-cov-2-variants/lineage-proposals/milestone/425?closed=1) | [#1089 🔵](https://github.com/sars-cov-2-variants/lineage-proposals/issues/1089) | [Multiple lineages](https://github.com/sars-cov-2-variants/lineage-proposals/labels/Multiple%20lineages), [S:346](https://github.com/sars-cov-2-variants/lineage-proposals/labels/S%3A346), [partially designated](https://github.com/sars-cov-2-variants/lineage-proposals/labels/partially%20designated), [JN.1](https://github.com/sars-cov-2-variants/lineage-proposals/labels/JN%2E1), [FLiRT](https://github.com/sars-cov-2-variants/lineage-proposals/labels/FLiRT) | 2nd
 `JN.1.9` | `B.1.1.529.2.86.1.1.9` | [⚑ 833](https://github.com/cov-lineages/pango-designation/milestone/833?closed=1) | [#2410](https://github.com/cov-lineages/pango-designation/issues/2410) |  | main
diff --git a/scripts/issue-milestone-collector/data/mappings.json b/scripts/issue-milestone-collector/data/mappings.json
index e2f551c6..abeb1850 100644
--- a/scripts/issue-milestone-collector/data/mappings.json
+++ b/scripts/issue-milestone-collector/data/mappings.json
@@ -4045,6 +4045,18 @@
       "unaliased": "B.1.1.529.2.86.1.1.7.1"
     }
   ],
+  "B.1.1.529.2.86.1.1.7.3": [
+    {
+      "pango": "JN.1.7.3",
+      "repo": "sars-cov-2-variants/lineage-proposals",
+      "milestone": 452,
+      "issue": 1343,
+      "labels": "S:346, S:455, S:572, JN.1, S:680",
+      "state": "CLOSED",
+      "reason": "NOT_PLANNED",
+      "unaliased": "B.1.1.529.2.86.1.1.7.3"
+    }
+  ],
   "B.1.1.529.2.86.1.1.8.1": [
     {
       "pango": "JN.1.8.1",
diff --git a/scripts/issue-milestone-collector/data/mappings.tsv b/scripts/issue-milestone-collector/data/mappings.tsv
index 6b91e04a..f141a098 100644
--- a/scripts/issue-milestone-collector/data/mappings.tsv
+++ b/scripts/issue-milestone-collector/data/mappings.tsv
@@ -338,6 +338,7 @@ JN.1.5	sars-cov-2-variants/lineage-proposals	381	1143	High local prevalence, des
 JN.1.6.1	sars-cov-2-variants/lineage-proposals	425	1089	Multiple lineages, S:346, partially designated, JN.1, FLiRT	OPEN	REOPENED	B.1.1.529.2.86.1.1.6.1
 JN.1.7	sars-cov-2-variants/lineage-proposals	389	1097	To be proposed, Multiple lineages, partially designated, BA.2.86, S:572, JN.1	OPEN		B.1.1.529.2.86.1.1.7
 JN.1.7.1	sars-cov-2-variants/lineage-proposals	420	1371	designated, S:346, S:572, JN.1	CLOSED	COMPLETED	B.1.1.529.2.86.1.1.7.1
+JN.1.7.3	sars-cov-2-variants/lineage-proposals	452	1343	S:346, S:455, S:572, JN.1, S:680	CLOSED	NOT_PLANNED	B.1.1.529.2.86.1.1.7.3
 JN.1.8.1	sars-cov-2-variants/lineage-proposals	389	1097	To be proposed, Multiple lineages, partially designated, BA.2.86, S:572, JN.1	OPEN		B.1.1.529.2.86.1.1.8.1
 JN.1.8.2	sars-cov-2-variants/lineage-proposals	425	1089	Multiple lineages, S:346, partially designated, JN.1, FLiRT	OPEN	REOPENED	B.1.1.529.2.86.1.1.8.2
 JN.1.9	cov-lineages/pango-designation	833	2410		CLOSED	COMPLETED	B.1.1.529.2.86.1.1.9
diff --git a/scripts/issue-milestone-collector/github-artifacts/mappings/sars-cov-2-variants_lineage-proposals.json b/scripts/issue-milestone-collector/github-artifacts/mappings/sars-cov-2-variants_lineage-proposals.json
index 14fdf1c0..a517b13f 100644
--- a/scripts/issue-milestone-collector/github-artifacts/mappings/sars-cov-2-variants_lineage-proposals.json
+++ b/scripts/issue-milestone-collector/github-artifacts/mappings/sars-cov-2-variants_lineage-proposals.json
@@ -5202,6 +5202,17 @@
       "reason": "REOPENED"
     }
   ],
+  "B.1.1.529.2.86.1.1.7.3": [
+    {
+      "pango": "JN.1.7.3",
+      "repo": "sars-cov-2-variants/lineage-proposals",
+      "milestone": 452,
+      "issue": 1343,
+      "labels": "S:346, S:455, S:572, JN.1, S:680",
+      "state": "CLOSED",
+      "reason": "NOT_PLANNED"
+    }
+  ],
   "B.1.1.529.2.86.3.2": [
     {
       "pango": "JQ.2",