diff --git a/pkgs/by-name/nw/nwg-hello/package.nix b/pkgs/by-name/nw/nwg-hello/package.nix
index 555699bd1c97..a99cc11c4be5 100644
--- a/pkgs/by-name/nw/nwg-hello/package.nix
+++ b/pkgs/by-name/nw/nwg-hello/package.nix
@@ -10,14 +10,14 @@
 
 python3Packages.buildPythonApplication rec {
   pname = "nwg-hello";
-  version = "0.3.1";
+  version = "0.4.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "nwg-piotr";
     repo = "nwg-hello";
     tag = "v${version}";
-    hash = "sha256-ZqZikkwV3UVA0e9VCFHjXAAIegvz3I6CNURZSP4owmU=";
+    hash = "sha256-yevcHctVnUWuPsdB+KN+Uuxg+iGdzP7WOOTMUvVmuEY=";
   };
 
   nativeBuildInputs = [
@@ -39,15 +39,15 @@ python3Packages.buildPythonApplication rec {
   postPatch = ''
     # hard coded paths
     substituteInPlace nwg_hello/main.py \
-      --replace '/etc/nwg-hello' "$out/etc/nwg-hello" \
-      --replace "/usr/share/xsessions" "/run/current-system/sw/share/xsessions" \
-      --replace "/usr/share/wayland-sessions" "/run/current-system/sw/share/wayland-sessions"
+      --replace-fail '/etc/nwg-hello' "$out/etc/nwg-hello" \
+      --replace-fail "/usr/share/xsessions" "/run/current-system/sw/share/xsessions" \
+      --replace-fail "/usr/share/wayland-sessions" "/run/current-system/sw/share/wayland-sessions"
 
     substituteInPlace nwg-hello-default.json \
-      --replace "/usr/share/xsessions" "/run/current-system/sw/share/xsessions" \
-      --replace "/usr/share/wayland-sessions" "/run/current-system/sw/share/wayland-sessions"
+      --replace-fail "/usr/share/xsessions" "/run/current-system/sw/share/xsessions" \
+      --replace-fail "/usr/share/wayland-sessions" "/run/current-system/sw/share/wayland-sessions"
 
-    substituteInPlace nwg_hello/ui.py --replace '/usr/share/nwg-hello' "$out/share/nwg-hello"
+    substituteInPlace nwg_hello/ui.py --replace-fail '/usr/share/nwg-hello' "$out/share/nwg-hello"
   '';
 
   postInstall = ''