diff --git a/default.nix b/default.nix
index a524792..903334f 100644
--- a/default.nix
+++ b/default.nix
@@ -1,9 +1,13 @@
 {
 
-  pkgs ? (import ./nix/pkgs.nix).stable,
+  pkgsAttrs ? (import ./nix/pkgs.nix),
   bootstrap ? null,
 
-}: rec {
+}: let
+
+  pkgs = pkgsAttrs.pkgs;
+
+in rec {
 
   rootedBootstrap = pkgs.stdenv.mkDerivation {
     name = "cryptic-net-rooted-bootstrap";
@@ -21,23 +25,30 @@
     name = "cryptic-net-version";
 
     buildInputs = [ pkgs.git pkgs.go ];
+
     src = ./.;
     inherit bootstrap;
+    nixPkgsVersion = pkgsAttrs.version;
+    nixPkgsRev = pkgsAttrs.rev;
+    builtByUser = builtins.getEnv "USER";
 
     builder = builtins.toFile "builder.sh" ''
       source $stdenv/setup
 
       versionFile=version
 
+      cp -r "$src" srcCp
+
       if [ "$bootstrap" != "" ]; then
         hostName=$(tar -xzf "$bootstrap" --to-stdout ./hostname)
         echo "Built for host:  $hostName" >> "$versionFile"
       fi
 
-      echo "Build date:      $(date)" >> "$versionFile"
-      echo "Git status:      $(cd "$src" && git describe --always --long --dirty=' (dirty)')" >> "$versionFile"
+      echo "Build date:      $(date) ($(date +%s))" >> "$versionFile"
+      echo "Built by:        $builtByUser" >> "$versionFile"
+      echo "Git rev:         $(cd srcCp && git describe --always --long --dirty=' (dirty)')" >> "$versionFile"
       echo "Go version:      $(go version)" >> "$versionFile"
-      echo "Build host info: $(uname -srvm)" >> "$versionFile"
+      echo "Nixpkgs version: $nixPkgsVersion ($nixPkgsRev)" >> "$versionFile"
 
       mkdir -p "$out"/share
       cp "$versionFile" "$out"/share
diff --git a/docs/shell.nix b/docs/shell.nix
index aec6302..14d9253 100644
--- a/docs/shell.nix
+++ b/docs/shell.nix
@@ -1,6 +1,6 @@
 {
 
-  pkgs ? (import ../nix/pkgs.nix).stable,
+  pkgs ? (import ../nix/pkgs.nix).pkgs,
 
 }: pkgs.mkShell {
   name = "cryptic-net-build-docs";
diff --git a/nix/pkgs.nix b/nix/pkgs.nix
index 9bf4561..b7ceca5 100644
--- a/nix/pkgs.nix
+++ b/nix/pkgs.nix
@@ -16,6 +16,7 @@ rec {
 
       in {
 
+        go = prev.go_1_18;
         buildGoModule = args: prev.buildGoModule (buildArgs // args);
         buildGo118Module = args: prev.buildGo118Module (buildArgs // args);
 
@@ -31,11 +32,14 @@ rec {
 
   ];
 
-  stableSrc = fetchTarball {
-    name = "nixpkgs-22-05";
-    url = "https://github.com/NixOS/nixpkgs/archive/2aec372cdcd4d73b94863611fea70e0884270fdc.tar.gz";
+  version = "22-05";
+  rev = "2aec372cdcd4d73b94863611fea70e0884270fdc";
+
+  src = fetchTarball {
+    name = "nixpkgs-${version}";
+    url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
     sha256 = "1pbfhlh4v8l70p44gspsci3i6w0wk70vaisiawg3jhka2nxb8367";
   };
 
-  stable = import stableSrc { inherit overlays; };
+  pkgs = import src { inherit overlays; };
 }