diff --git a/overlays/lib/nixpkgs.nix b/overlays/lib/nixpkgs.nix
index 92117189..2dd28198 100644
--- a/overlays/lib/nixpkgs.nix
+++ b/overlays/lib/nixpkgs.nix
@@ -8,7 +8,7 @@ let
     owner = "NixOS";
     repo = "nixpkgs";
     rev = "49ee0e94463abada1de470c9c07bfc12b36dcf40";
-    sha256 = "";
+    sha256 = "sha256-WrDV0FPMVd2Sq9hkR5LNHudS3OSMmUrs90JUTN+MXpA=";
   };
 in