diff --git a/.assets/timeline-gantt.png b/.assets/timeline-gantt.png
index 9d936fe..8c17108 100644
Binary files a/.assets/timeline-gantt.png and b/.assets/timeline-gantt.png differ
diff --git a/CALENDAR.md b/CALENDAR.md
index 10bcebe..782d818 100644
--- a/CALENDAR.md
+++ b/CALENDAR.md
@@ -24,7 +24,7 @@ Full untruncated version index.
 | **stable2509** | 1.20.0 | 2025-08-18 | 2025-10-08 | 2026-10-02 | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2509) |
 |   stable2509-1 | 1.20.1 | 2025-10-23 | 2025-10-23 |  | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2509-1) |
 |   stable2509-2 | 1.20.2 | 2025-11-17 | 2025-11-17 |  | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2509-2) |
-|   stable2509-3 | 1.20.3 | 2025-12-08 | 2025-12-11 |  | Planned |
+|   stable2509-3 | 1.20.3 | 2025-12-17 | 2025-12-17 |  | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2509-3) |
 |   stable2509-4 | 1.20.4 | 2026-01-12 | 2026-01-15 |  | Planned |
 |   stable2509-5 | 1.20.5 | 2026-02-09 | 2026-02-12 |  | Planned |
 |   stable2509-6 | 1.20.6 | 2026-03-09 | 2026-03-12 |  | Planned |
diff --git a/README.md b/README.md
index ef4dfa3..a74c18d 100644
--- a/README.md
+++ b/README.md
@@ -25,11 +25,11 @@ Planned and historic release dates:
 |   stable2512-2 | 1.21.2 | 2026-02-16 | 2026-02-19 |  | Planned |
 |   [10 more planned](CALENDAR.md) |  |  | | |
 | **stable2509** | 1.20.0 | 2025-08-18 | 2025-10-08 | 2026-10-02 | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2509) |
-|   stable2509-1 | 1.20.1 | 2025-10-23 | 2025-10-23 |  | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2509-1) |
 |   stable2509-2 | 1.20.2 | 2025-11-17 | 2025-11-17 |  | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2509-2) |
-|   stable2509-3 | 1.20.3 | 2025-12-08 | 2025-12-11 |  | Planned |
+|   stable2509-3 | 1.20.3 | 2025-12-17 | 2025-12-17 |  | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2509-3) |
 |   stable2509-4 | 1.20.4 | 2026-01-12 | 2026-01-15 |  | Planned |
-|   [9 more planned](CALENDAR.md) |  |  | | |
+|   stable2509-5 | 1.20.5 | 2026-02-09 | 2026-02-12 |  | Planned |
+|   [1 more past, 8 more planned](CALENDAR.md) |  |  | | |
 | **stable2506** | 1.19.0 | 2025-05-15 | 2025-07-24 | 2026-06-30 | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2506) |
 |   stable2506-4 | 1.19.4 | 2025-10-23 | 2025-10-23 |  | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2506-4) |
 |   stable2506-5 | 1.19.5 | 2025-11-11 | 2025-11-11 |  | [Released](https://github.com/paritytech/polkadot-sdk/releases/tag/polkadot-stable2506-5) |
diff --git a/releases-v1.ics b/releases-v1.ics
index 6f7d409..87ee949 100644
--- a/releases-v1.ics
+++ b/releases-v1.ics
@@ -1093,17 +1093,17 @@ DESCRIPTION:Release of stable2509-2 (released)\n\nFull Calendar: https://g
 END:VEVENT
 BEGIN:VEVENT
 SUMMARY:stable2509-3 Cutoff
-DTSTART;VALUE=DATE:20251208
-DTEND;VALUE=DATE:20251209
-DESCRIPTION:Cutoff for stable2509-3 (planned)\n\nFull Calendar: https://gi
- thub.com/paritytech/release-registry/blob/main/CALENDAR.md#calendar
+DTSTART;VALUE=DATE:20251217
+DTEND;VALUE=DATE:20251218
+DESCRIPTION:Cutoff for stable2509-3 (released)\n\nFull Calendar: https://g
+ ithub.com/paritytech/release-registry/blob/main/CALENDAR.md#calendar
 END:VEVENT
 BEGIN:VEVENT
 SUMMARY:stable2509-3 Release
-DTSTART;VALUE=DATE:20251211
-DTEND;VALUE=DATE:20251212
-DESCRIPTION:Release of stable2509-3 (planned)\n\nFull Calendar: https://gi
- thub.com/paritytech/release-registry/blob/main/CALENDAR.md#calendar
+DTSTART;VALUE=DATE:20251217
+DTEND;VALUE=DATE:20251218
+DESCRIPTION:Release of stable2509-3 (released)\n\nFull Calendar: https://g
+ ithub.com/paritytech/release-registry/blob/main/CALENDAR.md#calendar
 END:VEVENT
 BEGIN:VEVENT
 SUMMARY:stable2509-4 Cutoff
diff --git a/releases-v1.json b/releases-v1.json
index f09a3cb..de96699 100644
--- a/releases-v1.json
+++ b/releases-v1.json
@@ -927,13 +927,12 @@
           },
           {
             "name": "stable2509-3",
-            "cutoff": {
-              "estimated": "2025-12-08"
-            },
+            "cutoff": "2025-12-17",
             "publish": {
-              "estimated": "2025-12-11"
+              "when": "2025-12-17",
+              "tag": "polkadot-stable2509-3"
             },
-            "state": "planned",
+            "state": "released",
             "semver": "1.20.3"
           },
           {