diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4f2f5e4e..83e31cdb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,7 +9,8 @@ on:
     # rebuild everyday at 2:51
     # TIP: Choose a random time here so not all repositories are build at once:
     # https://www.random.org/clock-times/?num=1&earliest=01%3A00&latest=08%3A00&interval=5&format=html&rnd=new
-    - cron:  '50 3 * * *'
+    - cron:  '51 2 * * *'
+  workflow_dispatch:
 jobs:
   tests:
     strategy:
@@ -34,9 +35,9 @@ jobs:
         cachixName:
           - linyinfeng
         nixPath:
-          - nixpkgs=channel:nixos-unstable
-          - nixpkgs=channel:nixpkgs-unstable
-          - nixpkgs=channel:nixos-23.11
+          - 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: Maximize build space
@@ -51,7 +52,7 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
     - name: Install nix
-      uses: cachix/install-nix-action@v26
+      uses: cachix/install-nix-action@v30
       with:
         nix_path: "${{ matrix.nixPath }}"
         extra_nix_config: |
@@ -73,7 +74,7 @@ jobs:
     - name: Show nixpkgs version
       run: nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'
     - name: Setup cachix
-      uses: cachix/cachix-action@v14
+      uses: cachix/cachix-action@v15
       # Don't replace <YOUR_CACHIX_NAME> here!
       if: ${{ matrix.cachixName != '<YOUR_CACHIX_NAME>' }}
       with:
diff --git a/ci.nix b/ci.nix
index 396e94d3..be4b9245 100644
--- a/ci.nix
+++ b/ci.nix
@@ -17,7 +17,13 @@ with builtins;
 let
   isReserved = n: n == "lib" || n == "overlays" || n == "modules";
   isDerivation = p: isAttrs p && p ? type && p.type == "derivation";
-  isBuildable = p: !(p.meta.broken or false) && p.meta.license.free or true;
+  isBuildable =
+    p:
+    let
+      licenseFromMeta = p.meta.license or [ ];
+      licenseList = if builtins.isList licenseFromMeta then licenseFromMeta else [ licenseFromMeta ];
+    in
+    !(p.meta.broken or false) && builtins.all (license: license.free or true) licenseList;
   isCacheable = p: !(p.preferLocalBuild or false);
   shouldRecurseForDerivations = p: isAttrs p && p.recurseForDerivations or false;