diff --git a/README.md b/README.md
index 41c7c37..71a7770 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,20 @@ Do you like final? _Really_ like it? Then enforce it on all your classes! When y
 
 ## Installation
 
+### Running Psalm 5
+
 ```
 composer require --dev cspray/phinal
 vendor/bin/psalm-plugin enable cspray/phinal
 ```
 
+### Running Psalm 4
+
+```
+composer require --dev cspray/phinal:1.0.0
+vendor/bin/psalm-plugin enable cspray/phinal
+```
+
 ## Code Examples
 
 Good! :+1:
diff --git a/composer.json b/composer.json
index 670abf7..e2634b0 100644
--- a/composer.json
+++ b/composer.json
@@ -6,12 +6,12 @@
     "require": {
         "php": "^8.0",
         "ext-simplexml": "*",
-        "vimeo/psalm": "4.*"
+        "vimeo/psalm": "5.*"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5.5",
         "squizlabs/php_codesniffer": "^3.3",
-        "psalm/plugin-phpunit": "^0.16.0",
+        "psalm/plugin-phpunit": "^0.18",
         "weirdan/prophecy-shim": "^2.0",
         "weirdan/codeception-psalm-module": "^0.13.1",
         "codeception/codeception": "^4.1",