diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..61e11ff
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,63 @@
+on:
+  push:
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+name: Release workflow
+jobs:
+  build-phar:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.3
+          ini-values: memory_limit=2G, display_errors=On, error_reporting=-1, phar.readonly=0
+          tools: phive
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: composer-
+
+      - name: Install Composer dependencies
+        run: |
+          composer install --no-dev --no-progress --prefer-dist --optimize-autoloader
+
+      - name: Remove phpunit
+        run: composer remove phpunit/phpunit
+
+      - name: Install phive tools
+        run: phive install --trust-gpg-keys 2A8299CE842DD38C
+
+      - name: Build phar
+        run: make phar
+
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          draft: false
+          prerelease: false
+
+      - name: Upload Release Asset
+        id: upload-release-asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./build/prophecy-phpunit.phar
+          asset_name: prophecy-phpunit.phar
+          asset_content_type: application/zip
diff --git a/.gitignore b/.gitignore
index 9d98656..e39cd52 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 vendor
+build
 composer.lock
 phpunit.xml
 .*.cache
diff --git a/.phive/phars.xml b/.phive/phars.xml
new file mode 100644
index 0000000..a5cb741
--- /dev/null
+++ b/.phive/phars.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phive xmlns="https://phar.io/phive">
+  <phar name="phpab" version="^1.26.0" installed="1.26.0" location="./tools/phpab" copy="true"/>
+</phive>
diff --git a/composer.json b/composer.json
index 83a8818..bec680e 100644
--- a/composer.json
+++ b/composer.json
@@ -18,6 +18,9 @@
         "phpspec/prophecy": "^1.18",
         "phpunit/phpunit":"^9.1 || ^10.1"
     },
+    "require-dev": {
+        "phar-io/manifest": "^2.0"
+    },
     "autoload": {
         "psr-4": {
             "Prophecy\\PhpUnit\\": "src"
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..c5318a4
--- /dev/null
+++ b/makefile
@@ -0,0 +1,11 @@
+phar:
+	mkdir build;
+	cp -r src build/src;
+	cp -r vendor build;
+	rm -r build/vendor/phpspec;
+	cp manifest.xml build/manifest.xml;
+	cp LICENSE build/LICENSE
+	php -dphar.readonly=0 ./tools/phpab --phar -o ./build/prophecy-phpunit.phar --all --hash SHA-1 ./build
+
+clean:
+	rm -r build
diff --git a/manifest.xml b/manifest.xml
new file mode 100644
index 0000000..2c5352d
--- /dev/null
+++ b/manifest.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<phar xmlns="https://phar.io/xml/manifest/1.0">
+    <contains name="prophecy/prophecy-phpunit" version="1.0" type="extension">
+        <extension for="phpunit/phpunit" compatible="^9.1"/>
+    </contains>
+
+    <copyright>
+        <author name="Christophe Coevoet" email="stof@notk.org"/>
+        <license type="MIT" url="https://github.com/phpspec/prophecy-phpunit/blob/master/LICENSE"/>
+    </copyright>
+
+    <requires>
+        <php version="^7.3 || ^8.0"/>
+    </requires>
+</phar>