diff --git a/.github/workflows/build-artifacts.yml b/.github/workflows/build-artifacts.yml
index a60d168..78b6e46 100644
--- a/.github/workflows/build-artifacts.yml
+++ b/.github/workflows/build-artifacts.yml
@@ -11,30 +11,39 @@ on:
 
 jobs:
   Compile-All:
-    runs-on: macos-12
+    runs-on: ubuntu-latest
     steps:
+      - name: Maximize Build Space
+        uses: easimon/maximize-build-space@v10
+        with:
+          root-reserve-mb: 512
+          swap-size-mb: 1024
+          remove-dotnet: "true"
+
+      - name: Review Build Space
+        run: |
+          echo "Free space:"
+          df -h
+
       - uses: actions/checkout@v4
 
-      - name: Cache Vagrant boxes
-        uses: actions/cache@v4.0.2
+      - name: Install Nix
+        uses: cachix/install-nix-action@v26
         with:
-          path: ~/.vagrant.d/boxes
-          key: $${{ runner.os }}-vagrant-${{ hashFiles('Vagrantfile') }}
-          restore-keys: |
-            ${{ runner.os }}-vagrant-
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+          nix_path: nixpkgs=channel:nixos-unstable
 
-      - name: Show Vagrant version
-        run: vagrant --version
+      - uses: DeterminateSystems/magic-nix-cache-action@v6
 
-      - name: Run vagrant up & provision
+      - name: Compile TextMate Grammar
         run: |
-          vagrant plugin install vagrant-disksize
-          vagrant up --provision
-        env:
-          VER: 23.05
+          chmod +x ./scripts/compile-grammar.sh
+          ./scripts/compile-grammar.sh
 
-      - name: Get Coverage Badge SVG
-        run: make -B $(pwd)/images/coverage-badge.svg
+      - name: Compile Coverage Badge SVG
+        run: |
+          apt-get install -y xsltproc
+          make -B $(pwd)/images/coverage-badge.svg
 
       - name: Import GPG key
         id: import-gpg
diff --git a/Vagrantfile b/Vagrantfile
index 207c8c8..66a47b6 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -7,7 +7,7 @@ Vagrant.configure("2") do |config|
   config.vm.box = "nixbox/nixos"
   config.vm.box_version = ver.to_s
 
-  config.disksize.size = '8GB'
+  config.disksize.size = '10GB'
 
   config.vm.provider "virtualbox" do |vb|
     vb.gui = false
@@ -17,12 +17,8 @@ Vagrant.configure("2") do |config|
   config.vm.synced_folder ".", "/vagrant"
 
   config.vm.provision "shell", privileged: false, inline: <<-'SHELL'
-    cd /vagrant/
-    nix --version
-    df -h
-    echo "statix check && \
-      nix flake check --impure && \
-      cp \$(nix build --impure --no-link --print-out-paths)/parigp* ./syntaxes/" | \
-      nix-shell --run bash
+    SCRIPTNAME=scripts/compile-grammar.sh
+    chmod +x /vagrant/$SCRIPTNAME
+    /vagrant/$SCRIPTNAME
   SHELL
 end
diff --git a/flake.nix b/flake.nix
index 9c5fcff..b47fce8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -10,7 +10,7 @@
       {
         packages.${current_system}.default =
 
-        with import nixpkgs { system = current_system; };
+        with import ./nixpkgs.nix { system = current_system; };
         let vscode_tmgrammar_test =
           buildNpmPackage rec {
             pname = "vscode-tmgrammar-test";
diff --git a/nixpkgs.nix b/nixpkgs.nix
new file mode 100644
index 0000000..b0652ee
--- /dev/null
+++ b/nixpkgs.nix
@@ -0,0 +1,7 @@
+let
+  lock = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.nixpkgs.locked;
+in
+import (fetchTarball {
+  url = "https://github.com/nixos/nixpkgs/archive/${lock.rev}.tar.gz";
+  sha256 = lock.narHash;
+})
diff --git a/scripts/compile-grammar.sh b/scripts/compile-grammar.sh
new file mode 100755
index 0000000..c0eb869
--- /dev/null
+++ b/scripts/compile-grammar.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env nix-shell
+#!nix-shell ../shell.nix -i bash
+# compile-grammar.sh - Builds TextMate grammar with help of Nix.
+
+# shellcheck shell=sh
+set -e
+
+
+scriptPath="$(readlink -f $0)"
+rootDir=$(dirname "${scriptPath%/*}")
+
+statix check
+nix flake check --impure "$rootDir"
+
+cp $(nix build --impure \
+               --no-link \
+               --print-out-paths "$rootDir")/parigp* "$rootDir/syntaxes/"
diff --git a/shell.nix b/shell.nix
index 5dd0527..595e18d 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,4 @@
-{ pkgs ? (import <nixpkgs>) {} }:
+{ pkgs ? (import ./nixpkgs.nix) {} }:
 pkgs.mkShell {
   NIX_CONFIG = "experimental-features = nix-command flakes";
   nativeBuildInputs = with pkgs; [