diff --git a/descriptions-next/api.github.com/api.github.com.2022-11-28.json b/descriptions-next/api.github.com/api.github.com.2022-11-28.json
index 8549b46120..41532c530d 100644
--- a/descriptions-next/api.github.com/api.github.com.2022-11-28.json
+++ b/descriptions-next/api.github.com/api.github.com.2022-11-28.json
@@ -62654,6 +62654,10 @@
                       "not_planned"
                     ]
                   },
+                  "duplicate_issue_id": {
+                    "type": "integer",
+                    "description": "The ID of the issue to mark as the canonical duplicate when `state_reason` is `duplicate`. The issue must exist and be accessible to the authenticated user. Ignored when `state_reason` is not `duplicate`."
+                  },
                   "milestone": {
                     "oneOf": [
                       {
diff --git a/descriptions-next/api.github.com/api.github.com.2022-11-28.yaml b/descriptions-next/api.github.com/api.github.com.2022-11-28.yaml
index 77348108d0..aff1fd044a 100644
--- a/descriptions-next/api.github.com/api.github.com.2022-11-28.yaml
+++ b/descriptions-next/api.github.com/api.github.com.2022-11-28.yaml
@@ -46118,6 +46118,12 @@ paths:
                     is changed.
                   examples:
                   - not_planned
+                duplicate_issue_id:
+                  type: integer
+                  description: The ID of the issue to mark as the canonical duplicate
+                    when `state_reason` is `duplicate`. The issue must exist and be
+                    accessible to the authenticated user. Ignored when `state_reason`
+                    is not `duplicate`.
                 milestone:
                   oneOf:
                   - type: string
diff --git a/descriptions-next/api.github.com/api.github.com.2026-03-10.json b/descriptions-next/api.github.com/api.github.com.2026-03-10.json
index 1eb60f6fd2..de97d8e1b1 100644
--- a/descriptions-next/api.github.com/api.github.com.2026-03-10.json
+++ b/descriptions-next/api.github.com/api.github.com.2026-03-10.json
@@ -62565,6 +62565,10 @@
                       "not_planned"
                     ]
                   },
+                  "duplicate_issue_id": {
+                    "type": "integer",
+                    "description": "The ID of the issue to mark as the canonical duplicate when `state_reason` is `duplicate`. The issue must exist and be accessible to the authenticated user. Ignored when `state_reason` is not `duplicate`."
+                  },
                   "milestone": {
                     "oneOf": [
                       {
diff --git a/descriptions-next/api.github.com/api.github.com.2026-03-10.yaml b/descriptions-next/api.github.com/api.github.com.2026-03-10.yaml
index e4269743e6..a1c5f714dc 100644
--- a/descriptions-next/api.github.com/api.github.com.2026-03-10.yaml
+++ b/descriptions-next/api.github.com/api.github.com.2026-03-10.yaml
@@ -46043,6 +46043,12 @@ paths:
                     is changed.
                   examples:
                   - not_planned
+                duplicate_issue_id:
+                  type: integer
+                  description: The ID of the issue to mark as the canonical duplicate
+                    when `state_reason` is `duplicate`. The issue must exist and be
+                    accessible to the authenticated user. Ignored when `state_reason`
+                    is not `duplicate`.
                 milestone:
                   oneOf:
                   - type: string
diff --git a/descriptions-next/api.github.com/api.github.com.json b/descriptions-next/api.github.com/api.github.com.json
index ccca990354..82247b199b 100644
--- a/descriptions-next/api.github.com/api.github.com.json
+++ b/descriptions-next/api.github.com/api.github.com.json
@@ -62942,6 +62942,10 @@
                       "not_planned"
                     ]
                   },
+                  "duplicate_issue_id": {
+                    "type": "integer",
+                    "description": "The ID of the issue to mark as the canonical duplicate when `state_reason` is `duplicate`. The issue must exist and be accessible to the authenticated user. Ignored when `state_reason` is not `duplicate`."
+                  },
                   "milestone": {
                     "oneOf": [
                       {
diff --git a/descriptions-next/api.github.com/api.github.com.yaml b/descriptions-next/api.github.com/api.github.com.yaml
index 5c1e82b8af..c6c1b204dc 100644
--- a/descriptions-next/api.github.com/api.github.com.yaml
+++ b/descriptions-next/api.github.com/api.github.com.yaml
@@ -46296,6 +46296,12 @@ paths:
                     is changed.
                   examples:
                   - not_planned
+                duplicate_issue_id:
+                  type: integer
+                  description: The ID of the issue to mark as the canonical duplicate
+                    when `state_reason` is `duplicate`. The issue must exist and be
+                    accessible to the authenticated user. Ignored when `state_reason`
+                    is not `duplicate`.
                 milestone:
                   oneOf:
                   - type: string
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.json b/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.json
index 4661ce7181..d72147017c 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.json
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.json
@@ -487704,6 +487704,10 @@
                       "not_planned"
                     ]
                   },
+                  "duplicate_issue_id": {
+                    "type": "integer",
+                    "description": "The ID of the issue to mark as the canonical duplicate when `state_reason` is `duplicate`. The issue must exist and be accessible to the authenticated user. Ignored when `state_reason` is not `duplicate`."
+                  },
                   "milestone": {
                     "oneOf": [
                       {
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.yaml b/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.yaml
index 0a37085e0e..046f4e6913 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.yaml
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.2022-11-28.deref.yaml
@@ -90301,6 +90301,12 @@ paths:
                     is changed.
                   examples:
                   - not_planned
+                duplicate_issue_id:
+                  type: integer
+                  description: The ID of the issue to mark as the canonical duplicate
+                    when `state_reason` is `duplicate`. The issue must exist and be
+                    accessible to the authenticated user. Ignored when `state_reason`
+                    is not `duplicate`.
                 milestone:
                   oneOf:
                   - type: string
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.json b/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.json
index 6db63d5967..f65227a1db 100644
--- a/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.json
+++ b/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.json
@@ -478183,6 +478183,10 @@
                       "not_planned"
                     ]
                   },
+                  "duplicate_issue_id": {
+                    "type": "integer",
+                    "description": "The ID of the issue to mark as the canonical duplicate when `state_reason` is `duplicate`. The issue must exist and be accessible to the authenticated user. Ignored when `state_reason` is not `duplicate`."
+                  },
                   "milestone": {
                     "oneOf": [
                       {
diff --git a/descriptions-next/api.github.com/dereferenced/api.github.com.2026-03-10.deref.yaml b/descripti{"code":"deadline_exceeded","msg":"operation timed out"}