diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 77888e9..21af51c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -34,9 +34,9 @@ jobs:
         cachixName:
           - smaret
         nixPath:
-        #  - nixpkgs=channel:nixos-unstable
-        #  - nixpkgs=channel:nixpkgs-unstable
-          - nixpkgs=channel:nixos-22.11
+          - nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixpkgs-unstable.tar.gz
+          - nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixos-unstable.tar.gz
+          - nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixos-24.05.tar.gz
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
diff --git a/default.nix b/default.nix
index 8812363..8b1dd23 100644
--- a/default.nix
+++ b/default.nix
@@ -1,9 +1,10 @@
 { pkgs ? import <nixpkgs> { } }:
 
 {
-  lib = import ./lib { inherit pkgs; };
-  modules = import ./modules;
-  overlays = import ./overlays;
+  # The `lib`, `modules`, and `overlays` names are special
+  lib = import ./lib { inherit pkgs; }; # functions
+  modules = import ./modules; # NixOS modules
+  overlays = import ./overlays; # nixpkgs overlays
 
   astrochem = pkgs.python3Packages.toPythonModule (
     pkgs.callPackage ./pkgs/astrochem {
diff --git a/flake.lock b/flake.lock
index a804412..78cf35d 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1624561540,
-        "narHash": "sha256-izJ2PYZMGMsSkg+e7c9A1x3t/yOLT+qzUM6WQsc2tqo=",
+        "lastModified": 1712449641,
+        "narHash": "sha256-U9DDWMexN6o5Td2DznEgguh8TRIUnIl9levmit43GcI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c6a049a3d32293b24c0f894a840872cf67fd7c11",
+        "rev": "600b15aea1b36eeb43833a50b0e96579147099ff",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 4c84ed7..81a143f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,8 +14,9 @@
       forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
     in
     {
-      packages = forAllSystems (system: import ./default.nix {
+      legacyPackages = forAllSystems (system: import ./default.nix {
         pkgs = import nixpkgs { inherit system; };
       });
+      packages = forAllSystems (system: nixpkgs.lib.filterAttrs (_: v: nixpkgs.lib.isDerivation v) self.legacyPackages.${system});
     };
 }