diff --git a/default.nix b/default.nix
index 584aae4..d9687af 100644
--- a/default.nix
+++ b/default.nix
@@ -10,13 +10,13 @@
     }
   )
   , lib
-  , self
+  , version
 }:
 
 pkgs.buildGoApplication rec {
   pname = "out-of-tree";
 
-  version = "unstable";
+  inherit version;
 
   nativeBuildInputs = [ pkgs.makeWrapper ];
 
diff --git a/flake.nix b/flake.nix
index 138e396..cd77b66 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,9 +14,10 @@
             overlays = [ gomod2nix.overlays.default ];
           };
 
+          version = self.lastModifiedDate;
         in
         {
-          packages.default = pkgs.callPackage ./. { };
+          packages.default = pkgs.callPackage ./. { inherit version; };
           devShells.default = import ./shell.nix { inherit pkgs; };
         })
     );