diff --git a/control_plane/src/compute.rs b/control_plane/src/compute.rs
index 200dcd02e6..520870063a 100644
--- a/control_plane/src/compute.rs
+++ b/control_plane/src/compute.rs
@@ -324,6 +324,7 @@ impl PostgresNode {
                  max_connections = 100\n\
                  wal_sender_timeout = 0\n\
                  wal_level = replica\n\
+                 zenith.file_cache_size = 4096\n\
                  listen_addresses = '{address}'\n\
                  port = {port}\n",
                 address = self.address.ip(),
diff --git a/vendor/postgres b/vendor/postgres
index ef039e4222..d033b8ee91 160000
--- a/vendor/postgres
+++ b/vendor/postgres
@@ -1 +1 @@
-Subproject commit ef039e422200f84064621b04eaab692ae940c6ca
+Subproject commit d033b8ee9110de0a6fc7807203f31c0e534d0e0b