diff --git a/.github/workflows/cachix.yml b/.github/workflows/cachix.yml
new file mode 100644
index 0000000..106da09
--- /dev/null
+++ b/.github/workflows/cachix.yml
@@ -0,0 +1,35 @@
+name: Cachix build
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  linux:
+    name: Build Linux
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.3.4
+      - uses: cachix/install-nix-action@v13
+        with:
+          install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-3.0pre20201007_5257a25/install
+          extra_nix_config: experimental-features = nix-command flakes
+      - uses: cachix/cachix-action@v10
+        with:
+          name: lava
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+      - run: nix build .#linux-lava
+  wine:
+    name: Build Wine
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.3.4
+      - uses: cachix/install-nix-action@v13
+        with:
+          install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-3.0pre20201007_5257a25/install
+          extra_nix_config: experimental-features = nix-command flakes
+      - uses: cachix/cachix-action@v10
+        with:
+          name: lava
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+      - run: nix build .#wine-osu
diff --git a/flake.nix b/flake.nix
index f8e5eed..8a81322 100644
--- a/flake.nix
+++ b/flake.nix
@@ -12,6 +12,7 @@
       base = {
         system.configurationRevision = nixpkgs.lib.mkIf (self ? rev) self.rev;
         nix.registry.nixpkgs.flake = nixpkgs;
+        nixpkgs.overlays = builtins.attrValues overlays;
       };
       hm-base = {
         home-manager.useGlobalPkgs = true;
@@ -44,7 +45,17 @@
           ./hosts/winter
           secrets.nixosModules.winter
         ];
-        specialArgs = { inherit inputs overlays; };
+        specialArgs = { inherit overlays; };
       };
+
+      packages.x86_64-linux =
+        let
+          pkgs = import nixpkgs {
+            overlays = builtins.attrValues overlays;
+            system = "x86_64-linux";
+          };
+        in {
+          inherit (pkgs) linux-lava wine-osu;
+        };
     };
 }
diff --git a/hosts/winter/default.nix b/hosts/winter/default.nix
index ef742a2..46dbb1a 100644
--- a/hosts/winter/default.nix
+++ b/hosts/winter/default.nix
@@ -23,20 +23,22 @@
 
     ../../users/rin
   ];
-  nix = {
+  nix = rec {
     package = pkgs.nixUnstable;
+    binaryCaches = [
+      "https://cache.nixos.org?priority=10"
+      "https://lava.cachix.org"
+    ];
+    binaryCachePublicKeys = [
+      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+      "lava.cachix.org-1:8lTWI/3IKWHByzzYHZySunMPYs2eAJw2duL+uLZkSy0="
+    ];
+    trustedBinaryCaches = binaryCaches;
+
     extraOptions = ''
       experimental-features = nix-command flakes
     '';
   };
-  nixpkgs.overlays = with overlays; [
-    discord
-    linux
-    polybar
-    picom
-    wine-osu
-    winetricks
-  ];
   nixpkgs.config.allowUnfree = true;
 
   i18n.defaultLocale = "en_GB.UTF-8";
diff --git a/hosts/winter/kernel.nix b/hosts/winter/kernel.nix
index 3587527..084251b 100644
--- a/hosts/winter/kernel.nix
+++ b/hosts/winter/kernel.nix
@@ -28,7 +28,7 @@
       "intel_pstate=passive"
       "msr.allow_writes=on"
     ];
-    kernelPackages = pkgs.lib.mkForce pkgs.linux-lava;
+    kernelPackages = pkgs.lib.mkForce (pkgs.linuxPackagesFor pkgs.linux-lava);
   };
   zramSwap.enable = true;
 }
diff --git a/overlays/linux.nix b/overlays/linux.nix
index 202a587..5b48705 100644
--- a/overlays/linux.nix
+++ b/overlays/linux.nix
@@ -1,5 +1,5 @@
 self: super: {
-  linux-lava = super.linuxPackagesFor ((super.linuxManualConfig (
+  linux-lava = (super.linuxManualConfig (
   let
     major = "5";
     minor = "11";
@@ -71,5 +71,5 @@ self: super: {
         ia32Emulation = true;
       };
     };
-  }));
+  });
 }