diff --git a/nixos/server.nix b/nixos/server.nix
index 10beb4e..d13875b 100644
--- a/nixos/server.nix
+++ b/nixos/server.nix
@@ -2,6 +2,7 @@
   lib,
   config,
   self,
+  pkgs,
   ...
 }: {
   options.pim.tailscale.advertiseExitNode = lib.mkOption {
@@ -10,6 +11,8 @@
   };
 
   config = lib.mkIf (builtins.elem "server" config.deployment.tags) {
+    environment.systemPackages = [pkgs.unar];
+
     networking = {
       firewall.allowedTCPPorts = [config.services.prometheus.exporters.node.port];
       domain = "dmz";