diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2a760eb..57032c1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -83,7 +83,7 @@ jobs:
       with:
         php-version: '8.1'
         extensions: mbstring, intl
-        tools: cs2pr
+        tools: cs2pr, phive
         coverage: none
 
     - name: Get composer cache directory
@@ -101,11 +101,14 @@ jobs:
         key: ${{ runner.os }}-composer-${{ steps.key-date.outputs.date }}-${{ hashFiles('composer.json') }}-${{ matrix.prefer-lowest }}
 
     - name: Composer install
-      run: composer stan-setup
+      run: composer update
+
+    - name: Install PHP tools with phive.
+      run: phive install --trust-gpg-keys 'CF1A108D0E7AE720,51C67305FFC2E5C0,12CE0F1D262429A5'
 
     - name: Run PHP CodeSniffer
       run: vendor/bin/phpcs --report=checkstyle src/ tests/ | cs2pr
 
     - name: Run phpstan
-      if: success() || failure()
-      run: vendor/bin/phpstan.phar analyse --error-format=github
+      if: always()
+      run: tools/phpstan analyse --error-format=github
diff --git a/.gitignore b/.gitignore
index 7d92a90..690f4be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ composer.phar
 composer.lock
 .phpunit.result.cache
 phpunit.xml
+tools/
diff --git a/.phive/phars.xml b/.phive/phars.xml
new file mode 100644
index 0000000..2c741fd
--- /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="phpstan" version="1.8.0" installed="1.8.0" location="./tools/phpstan" copy="false"/>
+</phive>
diff --git a/composer.json b/composer.json
index 6d83b77..1bc1603 100644
--- a/composer.json
+++ b/composer.json
@@ -52,11 +52,11 @@
         ],
         "cs-check": "phpcs --colors --parallel=16 -p src/ tests/",
         "cs-fix": "phpcbf --colors --parallel=16 -p src/ tests/",
-        "phpstan": "phpstan.phar analyse",
+        "phpstan": "tools/phpstan analyse",
         "stan": [
             "@phpstan"
         ],
-        "stan-setup": "cp composer.json composer.backup && composer require --dev phpstan/phpstan:~1.8.0 && mv composer.backup composer.json",
+        "stan-setup": "phive install",
         "test": "phpunit"
     },
     "config": {