diff --git a/flake.lock b/flake.lock
index 8c315aa..b478fa0 100644
--- a/flake.lock
+++ b/flake.lock
@@ -143,13 +143,30 @@
         "type": "github"
       }
     },
+    "registry": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1657791189,
+        "narHash": "sha256-Z2ckMWqybpJjIdGIPuHcYzTL7DPTbFKpBZJJgGfFUog=",
+        "owner": "nixos",
+        "repo": "flake-registry",
+        "rev": "7a481cef7e86d6ceb4aec244d9bb085619360ba1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "flake-registry",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "comma": "comma",
         "home-manager": "home-manager",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-unstable": "nixpkgs-unstable",
-        "nurpkgs": "nurpkgs"
+        "nurpkgs": "nurpkgs",
+        "registry": "registry"
       }
     },
     "utils": {
diff --git a/flake.nix b/flake.nix
index a1a0890..1f8eee2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -25,14 +25,14 @@
         pkgs = import nixpkgs {
             inherit system;
 
-            config = { allowUnfree = true; };
+            config = { allowUnfree = true; replaceStdenv = { pkgs }: pkgs.ccacheStdenv; };
         };
 
         pkgs-unstable = import nixpkgs-unstable {
             inherit system;
 
             overlays = map (f: import f) unstable-overlays;
-            config = { allowUnfree = true; };
+            config = { allowUnfree = true; replaceStdenv = { pkgs }: pkgs.ccacheStdenv; };
         };
 
         variables = import ./src/common/variables.nix;
diff --git a/src/system.nix b/src/system.nix
index 0461863..aab1ade 100644
--- a/src/system.nix
+++ b/src/system.nix
@@ -16,9 +16,12 @@
       auto-optimise-store = true;
       keep-outputs = true;
       flake-registry = "${registry}/flake-registry.json";
+      extra-sandbox-paths = [ "/var/cache/ccache" ];
     };
   };
 
+  programs.ccache.enable = true;
+
   # Use the systemd-boot EFI boot loader.
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;