diff --git a/.github/workflows/phar-build.yml b/.github/workflows/phar-build.yml
new file mode 100644
index 00000000..ff2de60b
--- /dev/null
+++ b/.github/workflows/phar-build.yml
@@ -0,0 +1,64 @@
+name: Build PHAR
+
+on:
+    push:
+        branches: [ "main" ]
+    pull_request:
+        branches: [ "main" ]
+
+permissions:
+    contents: read
+
+jobs:
+    build-phar:
+        name: "Build PHAR"
+
+        runs-on: ${{ matrix.operating-system }}
+
+        strategy:
+            fail-fast: false
+            matrix:
+                dependencies:
+                    - "locked"
+                php-version:
+                    - "8.1"
+                operating-system:
+                    - "ubuntu-latest"
+
+        steps:
+            - name: "Checkout"
+              uses: "actions/checkout@v4"
+
+            - name: "Install PHP"
+              uses: "shivammathur/setup-php@v2"
+              with:
+                  coverage: none
+                  tools: composer:v2
+                  php-version: "${{ matrix.php-version }}"
+                  ini-values: memory_limit=-1
+
+            - name: "Get Composer Cache Directory"
+              id: composer-cache
+              run: |
+                  echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+            - name: "Cache Composer dependencies"
+              uses: "actions/cache@v3"
+              with:
+                  path: "${{ steps.composer-cache.outputs.dir }}"
+                  key: "php-${{ matrix.php-version }}-locked-composer-${{ hashFiles('**/composer.lock') }}"
+                  restore-keys: |
+                      php-${{ matrix.php-version }}-locked-composer-
+
+            - name: "Install locked dependencies"
+              run: "composer install --no-interaction --no-progress"
+
+            - name: "Build PHAR file"
+              run: "composer build:phar"
+
+            - name: "Test PHAR file"
+              run: "./spc.phar dev:extensions"
+
+            - uses: actions/upload-artifact@v3
+              with:
+                  path: spc.phar
diff --git a/box.json b/box.json
new file mode 100644
index 00000000..e688155e
--- /dev/null
+++ b/box.json
@@ -0,0 +1,10 @@
+{
+  "alias": "spc-php.phar",
+  "banner": false,
+  "blacklist": [
+    ".github",
+    "tests"
+  ],
+  "git-commit-short": "git_commit_short",
+  "output": "spc.phar"
+}
diff --git a/composer.json b/composer.json
index 14f6189b..706f8d64 100644
--- a/composer.json
+++ b/composer.json
@@ -20,6 +20,7 @@
         "captainhook/captainhook": "^5.10",
         "captainhook/plugin-composer": "^5.3",
         "friendsofphp/php-cs-fixer": "^3.25",
+        "humbug/box": "^4.3",
         "nunomaduro/collision": "^7.8",
         "phpstan/phpstan": "^1.10",
         "phpunit/phpunit": "^10.3"
@@ -44,7 +45,8 @@
     "scripts": {
         "analyse": "phpstan analyse --memory-limit 300M",
         "cs-fix": "php-cs-fixer fix",
-        "test": "vendor/bin/phpunit tests/ --no-coverage"
+        "test": "vendor/bin/phpunit tests/ --no-coverage",
+        "build:phar": "vendor/bin/box compile"
     },
     "config": {
         "allow-plugins": {