diff --git a/nixos/flake.lock b/nixos/flake.lock
index d7bf1bfc..e9aeb1d2 100644
--- a/nixos/flake.lock
+++ b/nixos/flake.lock
@@ -1318,11 +1318,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1770934405,
-        "narHash": "sha256-So7/cClgSGy9T0/qRfdO+Wths8wAmFW2w51WooSyFs0=",
+        "lastModified": 1770966681,
+        "narHash": "sha256-0XHEyYw9jaY3mfDcv833QhXR7MLwY95ilj1JcH2ziRw=",
         "owner": "colonelpanic8",
         "repo": "keepbook",
-        "rev": "0b035c3aea0a6b40d095ac0ffb784e8a1a4f5a93",
+        "rev": "5b0bf0c1b0009154a48cf9a6f938452121340f0f",
         "type": "github"
       },
       "original": {
diff --git a/nixos/keepbook-sync.nix b/nixos/keepbook-sync.nix
index 09c2d094..70150dc8 100644
--- a/nixos/keepbook-sync.nix
+++ b/nixos/keepbook-sync.nix
@@ -1,7 +1,13 @@
 { config, lib, pkgs, inputs, makeEnable, ... }:
-let
-  cfg = config.myModules."keepbook-sync";
-  keepbookTray = inputs.keepbook.packages.${pkgs.stdenv.hostPlatform.system}.keepbook-tray;
+	let
+	  cfg = config.myModules."keepbook-sync";
+	  keepbookTray =
+	    inputs.keepbook.packages.${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