diff --git a/nixos/essential.nix b/nixos/essential.nix
index be45afb0..90d2e334 100644
--- a/nixos/essential.nix
+++ b/nixos/essential.nix
@@ -1,4 +1,10 @@
-{ pkgs, ... }:
+{ pkgs, inputs, ... }:
+let
+  keepbook = inputs.keepbook.packages.${pkgs.stdenv.hostPlatform.system}.keepbook.overrideAttrs (_: {
+    # Upstream checks currently depend on TS artifacts that are not built in Nix.
+    doCheck = false;
+  });
+in
 {
   nixpkgs.config.allowBroken = true;
 
@@ -36,6 +42,7 @@
     ispell
     jq
     just
+    keepbook
     lshw
     lsof
     magic-wormhole-rs
diff --git a/nixos/flake.lock b/nixos/flake.lock
index 0dab3f10..65145165 100644
--- a/nixos/flake.lock
+++ b/nixos/flake.lock
@@ -1318,11 +1318,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1771447274,
-        "narHash": "sha256-W5TTADv4NGn0tpap2nkOTZAxVUGiJI7m2UiKQvfW+WY=",
+        "lastModified": 1771570718,
+        "narHash": "sha256-vmFe1a9gIOLcT8UdE/b+Z9Cb0KQzGQonwtrxcZX9hx8=",
         "owner": "colonelpanic8",
         "repo": "keepbook",
-        "rev": "d0feb8deed6a439fb0f673ce1b9026afb2240b70",
+        "rev": "c0154c4e701dc3726cc709b15ec01cad1175d4f8",
         "type": "github"
       },
       "original": {
diff --git a/nixos/keepbook-sync.nix b/nixos/keepbook-sync.nix
index 6a3b0e85..1b36a025 100644
--- a/nixos/keepbook-sync.nix
+++ b/nixos/keepbook-sync.nix
@@ -1,13 +1,13 @@
 { config, lib, pkgs, inputs, makeEnable, ... }:
-	let
-	  cfg = config.myModules."keepbook-sync";
-	  keepbookTray =
-	    inputs.keepbook.packages.${pkgs.stdenv.hostPlatform.system}.keepbook-tray.overrideAttrs (old: {
-	      # Upstream currently includes a contract test that expects a built TS CLI
-	      # entrypoint under ts/dist/, but the Nix build does not build the TS
-	      # artifacts first. Skip checks to keep the package usable on NixOS.
-	      doCheck = false;
-	    });
+let
+  cfg = config.myModules."keepbook-sync";
+  keepbookTray =
+    inputs.keepbook.packages.${pkgs.stdenv.hostPlatform.system}.keepbook-tray.overrideAttrs (_: {
+      # Upstream currently includes a contract test that expects a built TS CLI
+      # entrypoint under ts/dist/, but the Nix build does not build the TS
+      # artifacts first. Skip checks to keep the package usable on NixOS.
+      doCheck = false;
+    });
 
   daemonArgs = [
     "--config" cfg.configPath
@@ -24,6 +24,8 @@
   daemonExec = lib.escapeShellArgs ([ "${keepbookTray}/bin/keepbook-sync-daemon" ] ++ daemonArgs);
 
   enabledModule = makeEnable config "myModules.keepbook-sync" false {
+    environment.systemPackages = [ keepbookTray ];
+
     home-manager.users.${cfg.user} = {
       systemd.user.services.keepbook-sync-daemon = {
         Unit = {