diff --git a/server/src/systemNotices/registry.ts b/server/src/systemNotices/registry.ts
index 3dca1513f..faf2f8198 100644
--- a/server/src/systemNotices/registry.ts
+++ b/server/src/systemNotices/registry.ts
@@ -106,11 +106,14 @@ export const SYSTEM_NOTICES: SystemNotice[] = [
     conditions: [{ kind: 'managed', is: false }],
     publishedAt: '2026-08-22T00:00:00Z',
     priority: 110,
-    // The 4.0.x window. The copy is about this release, so somebody arriving on
-    // 4.1 — or jumping 3.x straight to 4.2 — should get that release's notice
-    // instead of this one, not a summary of a version they skipped.
+    // The whole 4.x line. The copy is about what 4.0.0 brought, and that is still
+    // what somebody arriving anywhere on 4.x is being introduced to — the minor
+    // releases after it add to that picture rather than replace it. Held open to
+    // the 5.0.0 boundary (exclusive) so a 4.1/4.2 install is not left with no
+    // notice at all, which is what a per-release window did the moment 4.1.0
+    // shipped without an entry of its own.
     minVersion: '4.0.0',
-    maxVersion: '4.1.0',
+    maxVersion: '5.0.0',
   },
 
   // ── Thank-you + support the project — shown once per install AND once per upgrade ──
diff --git a/server/tests/unit/systemNotices/registry.test.ts b/server/tests/unit/systemNotices/registry.test.ts
index 1c4c2ce41..0d7a4d6c7 100644
--- a/server/tests/unit/systemNotices/registry.test.ts
+++ b/server/tests/unit/systemNotices/registry.test.ts
@@ -65,19 +65,21 @@ describe('registry integrity', () => {
     }
   });
 
-  it('the 4.0.0 release notice is confined to the 4.0.x line', () => {
+  it('the 4.0.0 release notice covers the whole 4.x line', () => {
     const release = SYSTEM_NOTICES.find(n => n.id === 'release-4-0-0');
     expect(release).toBeDefined();
-    // Its copy is about this release, so it must not greet somebody who skipped
-    // straight past it, and it must not run alongside the next release's notice.
+    // It must not greet somebody still on 3.x...
     expect(isNoticeVersionActive(release!, '3.4.1')).toBe(false);
     expect(isNoticeVersionActive(release!, '4.0.0')).toBe(true);
     expect(isNoticeVersionActive(release!, '4.0.7')).toBe(true);
-    // The upper bound is exclusive, so every 4.0.x patch still gets it.
-    expect(isNoticeVersionActive(release!, '4.0.9')).toBe(true);
     expect(isNoticeVersionActive(release!, '4.0.12')).toBe(true);
-    expect(isNoticeVersionActive(release!, '4.1.0')).toBe(false);
-    expect(isNoticeVersionActive(release!, '4.2.0')).toBe(false);
+    // ...and it stays up across the minors, so no 4.x install is left without a
+    // notice the way 4.1.0 was under the old per-release window.
+    expect(isNoticeVersionActive(release!, '4.1.0')).toBe(true);
+    expect(isNoticeVersionActive(release!, '4.2.0')).toBe(true);
+    expect(isNoticeVersionActive(release!, '4.9.9')).toBe(true);
+    // The upper bound is exclusive: 5.0.0 gets its own notice.
+    expect(isNoticeVersionActive(release!, '5.0.0')).toBe(false);
   });
 
   it('the thank-you notice hands over to the release modal at 4.0.0', () => {