diff --git a/ops/nixos/bvm-twitterchiver/default.nix b/ops/nixos/bvm-twitterchiver/default.nix
index f7062bbce2..87cedb0cba 100644
--- a/ops/nixos/bvm-twitterchiver/default.nix
+++ b/ops/nixos/bvm-twitterchiver/default.nix
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-{ depot, ... }:
+{ depot, pkgs, ... }:
 let
   inherit (depot.ops) secrets;
 in {
@@ -23,6 +23,7 @@ in {
 
   services.postgresql = {
     enable = true;
+    package = pkgs.postgresql_14;
     ensureDatabases = [
       "twitterchiver"
     ];
diff --git a/ops/nixos/swann/default.nix b/ops/nixos/swann/default.nix
index ec5e37e128..dac7c428b9 100644
--- a/ops/nixos/swann/default.nix
+++ b/ops/nixos/swann/default.nix
@@ -604,7 +604,7 @@ in {
       subnet6 2a09:a443:1::/48 {
         range6 2a09:a443:1:1::/64;
         range6 2a09:a443:1:2::/64 temporary;
-        prefix6 2a09:a443:1:1000:: 2a09:a443:1:ffff:: /56;
+        prefix6 2a09:a443:1:1000:: 2a09:a443:1:ff00:: /56;
 
         option dhcp6.name-servers 2a09:a443:1::1;
         option dhcp6.domain-search "house.as205479.net";
@@ -612,7 +612,7 @@ in {
       subnet6 2a09:a443:3::/48 {
         range6 2a09:a443:3:1::/64;
         range6 2a09:a443:3:2::/64 temporary;
-        prefix6 2a09:a443:3:1000:: 2a09:a443:3:ffff:: /56;
+        prefix6 2a09:a443:3:1000:: 2a09:a443:3:ff00:: /56;
 
         option dhcp6.name-servers 2a09:a443:3::1;
         option dhcp6.domain-search "eduroam.as205479.net";