diff --git a/api/cluster.go b/api/cluster.go
index cc92196c94..4cc1d36cf4 100644
--- a/api/cluster.go
+++ b/api/cluster.go
@@ -89,7 +89,7 @@ func createCluster(w http.ResponseWriter, r *http.Request, t auth.Token) (err er
 
 // title: update provisioner cluster
 // path: /provisioner/clusters/{name}
-// method: PUT
+// method: POST
 // consume: application/x-www-form-urlencoded
 // produce: application/json
 // responses:
diff --git a/api/server.go b/api/server.go
index 1f28958777..a185a9152f 100644
--- a/api/server.go
+++ b/api/server.go
@@ -403,7 +403,7 @@ func RunServer(dry bool) http.Handler {
 	m.Add("1.2", "GET", "/metrics", promhttp.Handler())
 
 	m.Add("1.3", "POST", "/provisioner/clusters", AuthorizationRequiredHandler(createCluster))
-	m.Add("1.4", "PUT", "/provisioner/clusters/{name}", AuthorizationRequiredHandler(updateCluster))
+	m.Add("1.4", "POST", "/provisioner/clusters/{name}", AuthorizationRequiredHandler(updateCluster))
 	m.Add("1.3", "GET", "/provisioner/clusters", AuthorizationRequiredHandler(listClusters))
 	m.Add("1.3", "DELETE", "/provisioner/clusters/{name}", AuthorizationRequiredHandler(deleteCluster))
 
diff --git a/docs/reference/api.yaml b/docs/reference/api.yaml
index 26d496d389..697cc6ca9e 100644
--- a/docs/reference/api.yaml
+++ b/docs/reference/api.yaml
@@ -1679,7 +1679,7 @@ paths:
         type: string
         minLength: 1
         description: Cluster name.
-    put:
+    post:
       operationId: ClusterUpdate
       description: Update cluster.
       parameters: