diff --git a/flake.lock b/flake.lock
index 248ee45..80c5f3e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -22,16 +22,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1700468785,
-        "narHash": "sha256-dIb31ri1Ht3qSbk7hhm8i163T2D+ggvdt+afnrpLA/4=",
+        "lastModified": 1700419998,
+        "narHash": "sha256-aXh4adx9x9RlRMSykzR+bY8AOVjcwMEJO1ZeQROwbcE=",
         "owner": "Nixos",
         "repo": "nixpkgs",
-        "rev": "ae03901e1aa89caad3e04a883ebf39cc7caeb472",
+        "rev": "12a0ade5e458984675b9789a4b260ebabdd2d1ab",
         "type": "github"
       },
       "original": {
         "owner": "Nixos",
-        "ref": "master",
+        "ref": "nixos-unstable-small",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index 8da341c..53c1036 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,10 +3,7 @@
   description = "A nixos module to make buildbot a proper Nix-CI.";
 
   inputs = {
-    nixpkgs.url = "github:Nixos/nixpkgs/master";
-    # switch back later when https://github.com/NixOS/nixpkgs/pull/266270 is included:
-    # see: https://nixpk.gs/pr-tracker.html?pr=266270
-    #nixpkgs.url = "github:Nixos/nixpkgs/nixos-unstable-small";
+    nixpkgs.url = "github:Nixos/nixpkgs/nixos-unstable-small";
     flake-parts.url = "github:hercules-ci/flake-parts";
     flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";