diff --git a/default.nix b/default.nix
index 94f9c14..6bda4a9 100644
--- a/default.nix
+++ b/default.nix
@@ -6,7 +6,7 @@ buildGoModule {
 
   src = ./.;
 
-  vendorHash = null;
+  vendorHash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
 
   meta = with lib; {
     description = "Henna gallery server";
diff --git a/flake.nix b/flake.nix
index fdfbbd6..04b26a4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -25,7 +25,7 @@
           pname = "henna";
           version = "0.1.0";
           src = ./.;
-          vendorHash = null;
+          vendorHash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
 
           buildInputs = [ pkgs.sqlite ];
         };