diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f13f908..4e1be43 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ on:
 
 jobs:
   testsuite-linux:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix:
@@ -62,7 +62,7 @@ jobs:
 
   cs-stan:
     name: Coding Standard & Static Analysis
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v2
@@ -73,7 +73,7 @@ jobs:
         php-version: '7.4'
         extensions: mbstring, intl
         coverage: none
-        tools: psalm:~4.1.0, cs2pr
+        tools: phive, cs2pr
 
     - name: Composer Install
       run: composer install
@@ -81,5 +81,9 @@ jobs:
     - name: Run phpcs
       run: vendor/bin/phpcs --report=checkstyle src/ tests/ | cs2pr
 
+    - name: Install PHP tools with phive.
+      run: phive install --trust-gpg-keys 'CF1A108D0E7AE720,51C67305FFC2E5C0,12CE0F1D262429A5'
+
     - name: Run psalm
-      run: psalm --output-format=github
+      if: always()
+      run: tools/psalm --output-format=github
diff --git a/.phive/phars.xml b/.phive/phars.xml
new file mode 100644
index 0000000..cdacf95
--- /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="psalm" version="4.30.0" installed="4.30.0" location="./tools/psalm" copy="false"/>
+</phive>
diff --git a/composer.json b/composer.json
index 3a14a04..6619295 100644
--- a/composer.json
+++ b/composer.json
@@ -35,5 +35,13 @@
     "config": {
         "sort-packages": true
     },
-    "prefer-stable": true
+    "prefer-stable": true,
+    "scripts": {
+        "cs-check": "phpcs --colors --parallel=16 -p src/ tests/",
+        "cs-fix": "phpcbf --colors --parallel=16 -p src/ tests/",
+        "psalm": "tools/psalm --show-info=false",
+        "stan-setup": "phive install",
+        "test": "phpunit",
+        "test-coverage": "phpunit --coverage-clover=clover.xml"
+    }
 }
diff --git a/psalm-baseline.xml b/psalm-baseline.xml
new file mode 100644
index 0000000..b5cd20f
--- /dev/null
+++ b/psalm-baseline.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<files psalm-version="4.x-dev@">
+  <file src="src/Plugin.php">
+    <InvalidArgument occurrences="1">
+      <code>$pathMap</code>
+    </InvalidArgument>
+  </file>
+</files>
diff --git a/psalm.xml b/psalm.xml
index 8dc065a..dcc61e7 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -1,10 +1,10 @@
 <?xml version="1.0"?>
 <psalm
     errorLevel="5"
-    resolveFromConfigFile="true"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
+    errorBaseline="psalm-baseline.xml"
 >
     <projectFiles>
         <directory name="src" />