diff --git a/pageserver/client/src/mgmt_api.rs b/pageserver/client/src/mgmt_api.rs
index a68f45a6d9db..2d95ac42e607 100644
--- a/pageserver/client/src/mgmt_api.rs
+++ b/pageserver/client/src/mgmt_api.rs
@@ -432,7 +432,7 @@ impl Client {
             self.mgmt_api_endpoint
         );
 
-        self.request(Method::POST, &uri, req)
+        self.request(Method::PUT, &uri, req)
             .await?
             .json()
             .await
diff --git a/pageserver/src/http/routes.rs b/pageserver/src/http/routes.rs
index d645f3b7b647..6a10d4fb1c3e 100644
--- a/pageserver/src/http/routes.rs
+++ b/pageserver/src/http/routes.rs
@@ -2955,7 +2955,7 @@ pub fn make_router(
             "/v1/tenant/:tenant_shard_id/timeline/:timeline_id/preserve_initdb_archive",
             |r| api_handler(r, timeline_preserve_initdb_handler),
         )
-        .post(
+        .put(
             "/v1/tenant/:tenant_shard_id/timeline/:timeline_id/archival_config",
             |r| api_handler(r, timeline_archival_config_handler),
         )
diff --git a/storage_controller/src/http.rs b/storage_controller/src/http.rs
index 1745bf557525..95e4a469ac95 100644
--- a/storage_controller/src/http.rs
+++ b/storage_controller/src/http.rs
@@ -1849,7 +1849,7 @@ pub fn make_router(
                 RequestName("v1_tenant_timeline"),
             )
         })
-        .post(
+        .put(
             "/v1/tenant/:tenant_id/timeline/:timeline_id/archival_config",
             |r| {
                 tenant_service_handler(
diff --git a/storage_controller/src/pageserver_client.rs b/storage_controller/src/pageserver_client.rs
index 961a1f78ddca..b19cbc4fa3cf 100644
--- a/storage_controller/src/pageserver_client.rs
+++ b/storage_controller/src/pageserver_client.rs
@@ -238,7 +238,7 @@ impl PageserverClient {
     ) -> Result<()> {
         measured_request!(
             "timeline_archival_config",
-            crate::metrics::Method::Post,
+            crate::metrics::Method::Put,
             &self.node_id_label,
             self.inner
                 .timeline_archival_config(tenant_shard_id, timeline_id, req)
diff --git a/test_runner/fixtures/pageserver/http.py b/test_runner/fixtures/pageserver/http.py
index 582f9c026439..0dd557c59f28 100644
--- a/test_runner/fixtures/pageserver/http.py
+++ b/test_runner/fixtures/pageserver/http.py
@@ -631,7 +631,7 @@ def timeline_archival_config(
         log.info(
             f"requesting timeline archival config {config} for tenant {tenant_id} and timeline {timeline_id}"
         )
-        res = self.post(
+        res = self.put(
             f"http://localhost:{self.port}/v1/tenant/{tenant_id}/timeline/{timeline_id}/archival_config",
             json=config,
         )