diff --git a/CHANGELOG.md b/CHANGELOG.md
index 387d4e7..549924d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,16 @@
+## Vikunja fixture: the create verb is PUT, not POST (2026-09-21, R-462)
+
+Test code only, and a one-line correction to the fixture shipped earlier the same night.
+
+Vikunja CREATES a project with **`PUT /api/v1/projects`**. The fixture sent `POST`, which answers
+`405 Method Not Allowed` — and a 405 in the middle of a seed reads like a broken app rather than a
+wrong verb. Measured on the box before the fixture was ported here; the box-side copy was corrected
+at the same time and its edge then walked clean (`vikunja 2.3.0 -> 2.6.0`, proven, 24.6 s).
+
+Kept as its own entry rather than folded into the previous one, because the previous entry claims
+these fixtures were proven box-side first — and for this one line that claim was true of the SEED
+ROUTE and not of the verb the port carried.
+
 ## Upgrade harness: four new fixtures and seven real upstream EDGES (2026-09-21, R-462)
 
 **Test code only. No template changed, and no `image:` line moved.** The update night
diff --git a/scripts/upgrade_fixtures.py b/scripts/upgrade_fixtures.py
index dba502f..5755c22 100644
--- a/scripts/upgrade_fixtures.py
+++ b/scripts/upgrade_fixtures.py
@@ -457,9 +457,11 @@ class Vikunja:
             say("    vikunja: could not log in after registering")
             return None
         title = "spike-" + secrets.token_hex(5)
+        # Vikunja CREATES with PUT, not POST — a POST answers `405 Method Not Allowed`, which
+        # reads like a broken fixture and is really the wrong verb. Measured 2026-09-21.
         rc, code, out = _curl(base + "/api/v1/projects", "-H", f"Authorization: Bearer {tok}",
                               "-H", "Content-Type: application/json",
-                              data=json.dumps({"title": title}), method="POST")
+                              data=json.dumps({"title": title}), method="PUT")
         say(f"    vikunja: create project http={code}")
         if code not in ("200", "201"):
             say(f"    vikunja: project refused {out[:200]}")