diff --git a/pageserver/src/tenant/remote_timeline_client/index.rs b/pageserver/src/tenant/remote_timeline_client/index.rs
index 8e6290030d..90453b1922 100644
--- a/pageserver/src/tenant/remote_timeline_client/index.rs
+++ b/pageserver/src/tenant/remote_timeline_client/index.rs
@@ -88,10 +88,11 @@ impl IndexPart {
     /// - 6: last_aux_file_policy is added.
     /// - 7: metadata_bytes is no longer written, but still read
     /// - 8: added `archived_at`
-    const LATEST_VERSION: usize = 8;
+    /// - 9: +gc_blocking
+    const LATEST_VERSION: usize = 9;
 
     // Versions we may see when reading from a bucket.
-    pub const KNOWN_VERSIONS: &'static [usize] = &[1, 2, 3, 4, 5, 6, 7, 8];
+    pub const KNOWN_VERSIONS: &'static [usize] = &[1, 2, 3, 4, 5, 6, 7, 8, 9];
 
     pub const FILE_NAME: &'static str = "index_part.json";
 
diff --git a/storage_scrubber/src/checks.rs b/storage_scrubber/src/checks.rs
index 5aa9e88c40..14788515dd 100644
--- a/storage_scrubber/src/checks.rs
+++ b/storage_scrubber/src/checks.rs
@@ -92,7 +92,7 @@ pub(crate) async fn branch_cleanup_and_check_errors(
                             .push(format!("index_part.json version: {}", index_part.version()))
                     }
 
-                    let mut newest_versions = IndexPart::KNOWN_VERSIONS.iter().rev().take(2);
+                    let mut newest_versions = IndexPart::KNOWN_VERSIONS.iter().rev().take(3);
                     if !newest_versions.any(|ip| ip == &index_part.version()) {
                         info!(
                             "index_part.json version is not latest: {}",