diff --git a/dev/README.md b/dev/README.md
index 23ede16..e17e76b 100644
--- a/dev/README.md
+++ b/dev/README.md
@@ -97,5 +97,5 @@ It's easiest to use an existing service as a template:
   Most other services use packages that are already included in nixpkgs.
 
 ## Switching to a new NixOS release
-- Run command `update-flake.sh 25.11`
+- Run command `update-flake.sh 26.05`
 - Treewide: check if any `TODO-EXTERNAL` comments can be resolved
diff --git a/examples/configuration.nix b/examples/configuration.nix
index c942de9..2728495 100644
--- a/examples/configuration.nix
+++ b/examples/configuration.nix
@@ -324,7 +324,7 @@
   # this value at the release version of the first install of this system.
   # Before changing this value read the documentation for this option
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-  system.stateVersion = "25.11"; # Did you read the comment?
+  system.stateVersion = "26.05"; # Did you read the comment?
 
   # The nix-bitcoin release version that your config is compatible with.
   # When upgrading to a backwards-incompatible release, nix-bitcoin will display an
diff --git a/examples/container/flake.nix b/examples/container/flake.nix
index 137f2d4..64bac2f 100644
--- a/examples/container/flake.nix
+++ b/examples/container/flake.nix
@@ -12,7 +12,7 @@
   inputs = {
     nix-bitcoin.url = "github:fort-nix/nix-bitcoin/release";
     # You can also use a version branch to track a specific NixOS release
-    # nix-bitcoin.url = "github:fort-nix/nix-bitcoin/nixos-25.11";
+    # nix-bitcoin.url = "github:fort-nix/nix-bitcoin/nixos-26.05";
 
     nixpkgs.follows = "nix-bitcoin/nixpkgs";
     nixpkgs-unstable.follows = "nix-bitcoin/nixpkgs-unstable";
diff --git a/examples/flakes/flake.nix b/examples/flakes/flake.nix
index 33dbb4b..5a63c1d 100644
--- a/examples/flakes/flake.nix
+++ b/examples/flakes/flake.nix
@@ -10,7 +10,7 @@
 
   inputs.nix-bitcoin.url = "github:fort-nix/nix-bitcoin/release";
   # You can also use a version branch to track a specific NixOS release
-  # inputs.nix-bitcoin.url = "github:fort-nix/nix-bitcoin/nixos-25.11";
+  # inputs.nix-bitcoin.url = "github:fort-nix/nix-bitcoin/nixos-26.05";
 
   inputs.nixpkgs.follows = "nix-bitcoin/nixpkgs";
   inputs.nixpkgs-unstable.follows = "nix-bitcoin/nixpkgs-unstable";
diff --git a/flake.lock b/flake.lock
index 954abe6..6c4c5b2 100644
--- a/flake.lock
+++ b/flake.lock
@@ -44,16 +44,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1782847189,
-        "narHash": "sha256-twXPFqFsrrY5r28Zh7Homgcp2gUMBgQ6WDS98Q/3xFI=",
+        "lastModified": 1784432872,
+        "narHash": "sha256-n3gKTBIV4ZA5VQpUakffBe3KGu4+mhPoA34rrqS0GkA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b6018f87da91d19d0ab4cf979885689b469cdd41",
+        "rev": "fd1462031fdee08f65fd0b4c6b64e22239a77870",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-25.11",
+        "ref": "nixos-26.05",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index f43ce7e..bcc53b7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,7 +5,7 @@
   '';
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
     nixpkgs-25_05.url = "github:NixOS/nixpkgs/nixos-25.05";
     flake-utils.url = "github:numtide/flake-utils";
diff --git a/pkgs/pinned.nix b/pkgs/pinned.nix
index f5760f2..5d334c0 100644
--- a/pkgs/pinned.nix
+++ b/pkgs/pinned.nix
@@ -4,18 +4,18 @@ pkgs: pkgsUnstable: pkgs-25_05:
   inherit (pkgs)
     bitcoin
     bitcoind
+    btcpayserver
     charge-lnd
+    clboss
+    clightning
     electrs
+    elementsd
     extra-container
     lightning-pool
     lndconnect;
 
   inherit (pkgsUnstable)
     bitcoind-knots
-    btcpayserver
-    clboss
-    clightning
-    elementsd
     fulcrum
     lightning-loop
     lnd;
diff --git a/test/lib/make-test.nix b/test/lib/make-test.nix
index e710227..fb878b3 100644
--- a/test/lib/make-test.nix
+++ b/test/lib/make-test.nix
@@ -22,8 +22,8 @@ let
       test.shellcheckServices.enable = true;
     };
 
-    testScript = nodes: let
-      cfg = nodes.nodes.machine;
+    testScript = { nodes, ... }: let
+      cfg = nodes.machine;
       data = {
         data = cfg.test.data;
         tests = cfg.tests;
diff --git a/test/tests.py b/test/tests.py
index 3509f4b..7261f5b 100644
--- a/test/tests.py
+++ b/test/tests.py
@@ -1,5 +1,6 @@
 from collections import OrderedDict
 import json
+import os
 import re
 
 def succeed(*cmds):