diff --git a/configuration.nix b/configuration.nix
index ede61d8..7855b3f 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -13,7 +13,9 @@
     ./lldap.nix
     ./vaultwarden.nix
     ./radicale.nix
+    ./calDavToCsv.nix
   ];
+  services.calDavToCsv.enable = true;
   # Add flake support
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
   # Use the GRUB 2 boot loader.
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..6c214fd
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,48 @@
+{
+  "nodes": {
+    "calDavToCsv": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1763298643,
+        "narHash": "sha256-oFfWpSGnCtLVGUdOzpLExKLIA3Y7UXXGkAot7Ve3mXk=",
+        "ref": "refs/heads/main",
+        "rev": "0979838bf8d869c24957d32e1bae2fc30fa9be20",
+        "revCount": 11,
+        "type": "git",
+        "url": "https://git.stuce.ch/stuce/calDAVtoCSV"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://git.stuce.ch/stuce/calDAVtoCSV"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1763049705,
+        "narHash": "sha256-A5LS0AJZ1yDPTa2fHxufZN++n8MCmtgrJDtxFxrH4S8=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "3acb677ea67d4c6218f33de0db0955f116b7588c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "calDavToCsv": "calDavToCsv",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}