diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index c7f7860..15e2d4a 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -86,7 +86,7 @@
 
   # PKG config
     shellHook = ''
-    export PKG_CONFIG_PATH=${pkgs.gtkmm}/lib/pkgconfig:$PKG_CONFIG_PATH
+    export PKG_CONFIG_PATH=${pkgs.gtkmm4}/lib/pkgconfig:$PKG_CONFIG_PATH
   '';
 
   # Configure console keymap