diff --git a/flake.lock b/flake.lock
index ffc815b..5a5b091 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,16 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1706098335,
-        "narHash": "sha256-r3dWjT8P9/Ah5m5ul4WqIWD8muj5F+/gbCdjiNVBKmU=",
+        "lastModified": 1764983851,
+        "narHash": "sha256-y7RPKl/jJ/KAP/VKLMghMgXTlvNIJMHKskl8/Uuar7o=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a77ab169a83a4175169d78684ddd2e54486ac651",
+        "rev": "d9bc5c7dceb30d8d6fafa10aeb6aa8a48c218454",
         "type": "github"
       },
       "original": {
         "id": "nixpkgs",
-        "ref": "nixos-23.11",
+        "ref": "nixos-25.11",
         "type": "indirect"
       }
     },
diff --git a/flake.nix b/flake.nix
index b284666..e24bd45 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "NixOS modules for matrix related services";
 
   inputs = {
-    nixpkgs.url = "nixpkgs/nixos-23.11";
+    nixpkgs.url = "nixpkgs/nixos-25.11";
   };
 
   outputs = { self, nixpkgs }: {
@@ -12,7 +12,7 @@
 
     lib = import ./lib.nix { lib = nixpkgs.lib; };
 
-    packages = let
+    checks = let
       forAllSystems = f:
         nixpkgs.lib.genAttrs [
           "x86_64-linux"
@@ -20,11 +20,13 @@
           "x86_64-darwin"
           "aarch64-darwin"
         ] (system: f nixpkgs.legacyPackages.${system});
-    in forAllSystems (pkgs: {
+    in forAllSystems (pkgs: let
       tests = import ./tests {
         inherit nixpkgs pkgs;
         matrix-lib = self.lib;
       };
+    in {
+      inherit (tests) nginx-pipeline-eval;
     });
   };
 }
diff --git a/synapse-module/default.nix b/synapse-module/default.nix
index 1cdc345..c4c3fde 100644
--- a/synapse-module/default.nix
+++ b/synapse-module/default.nix
@@ -427,7 +427,7 @@ in
         wantedBy = [ "matrix-synapse.target" ];
 
         preStart = let
-          flags = lib.cli.toGNUCommandLineShell {} {
+          flags = lib.cli.toCommandLineShellGNU {} {
             config-path = [ matrix-synapse-common-config ] ++ cfg.extraConfigFiles;
             keys-directory = cfg.dataDir;
             generate-keys = true;
@@ -443,12 +443,12 @@ in
           StateDirectory = "matrix-synapse";
           RuntimeDirectory = "matrix-synapse";
           ExecStart = let
-            flags = lib.cli.toGNUCommandLineShell {} {
+            flags = lib.cli.toCommandLineShellGNU {} {
               config-path = [ matrix-synapse-common-config ] ++ cfg.extraConfigFiles;
               keys-directory = cfg.dataDir;
             };
           in "${wrapped}/bin/synapse_homeserver ${flags}";
-          ExecReload = "${pkgs.utillinux}/bin/kill -HUP $MAINPID";
+          ExecReload = "${lib.getExe' pkgs.coreutils "kill"} -HUP $MAINPID";
           Restart = "on-failure";
         };
       };
diff --git a/synapse-module/workers.nix b/synapse-module/workers.nix
index ed60628..b068011 100644
--- a/synapse-module/workers.nix
+++ b/synapse-module/workers.nix
@@ -389,7 +389,7 @@ in {
             done
           '';
           ExecStart = let
-            flags = lib.cli.toGNUCommandLineShell {} {
+            flags = lib.cli.toCommandLineShellGNU {} {
               config-path = [ matrix-synapse-common-config (workerConfig worker) ] ++ cfg.extraConfigFiles;
               keys-directory = cfg.dataDir;
             };
diff --git a/tests/default.nix b/tests/default.nix
index 5ad1572..ac68032 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -1,4 +1,4 @@
 { nixpkgs, pkgs, matrix-lib, ... }:
 {
-  nginx-pipeline = pkgs.callPackage ./nginx-pipeline { inherit nixpkgs matrix-lib; };
+  nginx-pipeline-eval = pkgs.callPackage ./nginx-pipeline { inherit nixpkgs matrix-lib; };
 }
diff --git a/tests/nginx-pipeline/default.nix b/tests/nginx-pipeline/default.nix
index 03958cc..b59864a 100644
--- a/tests/nginx-pipeline/default.nix
+++ b/tests/nginx-pipeline/default.nix
@@ -5,7 +5,7 @@ let
     modules = [
       ../../module.nix
       {
-        system.stateVersion = "23.11";
+        system.stateVersion = "25.11";
         boot.isContainer = true;
         services.matrix-synapse-next = {
           enable = true;