diff --git a/nixos/doc/manual/release-notes/rl-2511.section.md b/nixos/doc/manual/release-notes/rl-2511.section.md
index d554f60a68c2..295d9ede7118 100644
--- a/nixos/doc/manual/release-notes/rl-2511.section.md
+++ b/nixos/doc/manual/release-notes/rl-2511.section.md
@@ -8,6 +8,8 @@
 
 - Secure boot support can now be enabled for the Limine bootloader through {option}`boot.loader.limine.secureBoot.enable`. Bootloader install script signs the bootloader, then kernels are hashed during system rebuild and written to a config. This allows Limine to boot only the kernels installed through NixOS system.
 
+- The default PostgreSQL version for new NixOS installations (i.e. with `system.stateVersion >= 25.11`) is v17.
+
 ## New Modules {#sec-release-25.11-new-modules}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
diff --git a/nixos/modules/services/databases/postgresql.nix b/nixos/modules/services/databases/postgresql.nix
index dc8b05b46458..2c0a8f5d4106 100644
--- a/nixos/modules/services/databases/postgresql.nix
+++ b/nixos/modules/services/databases/postgresql.nix
@@ -124,7 +124,9 @@ in
         type = types.package;
         example = literalExpression "pkgs.postgresql_15";
         defaultText = literalExpression ''
-          if versionAtLeast config.system.stateVersion "24.11" then
+          if versionAtLeast config.system.stateVersion "25.11" then
+            pkgs.postgresql_17
+          else if versionAtLeast config.system.stateVersion "24.11" then
             pkgs.postgresql_16
           else if versionAtLeast config.system.stateVersion "23.11" then
             pkgs.postgresql_15
@@ -671,7 +673,9 @@ in
           '';
         base =
           # XXX Don't forget to keep `defaultText` of `services.postgresql.package` up to date!
-          if versionAtLeast config.system.stateVersion "24.11" then
+          if versionAtLeast config.system.stateVersion "25.11" then
+            pkgs.postgresql_17
+          else if versionAtLeast config.system.stateVersion "24.11" then
             pkgs.postgresql_16
           else if versionAtLeast config.system.stateVersion "23.11" then
             pkgs.postgresql_15