diff --git a/README.md b/README.md
index 029d0e463003..da92eb69af92 100644
--- a/README.md
+++ b/README.md
@@ -35,13 +35,11 @@ Rector can:
 ## Install
 
 ```bash
-composer require --dev rector/rector:'dev-master' nikic/php-parser:'4.0.x-dev'
+composer require --dev rector/rector:'dev-master'
 ```
 
 ### Do you Have Conflicts?
 
-It may also happen your dependencies are in conflict, e.g. [PHPStan](https://github.com/phpstan/phpstan) requires [PHP-Parser](https://github.com/nikic/PHP-Parser) version 3, or older PHPUnit etc. This might be solved in the future, when PHP-Parser version 4 becomes stable.
-
 Since Rector **uses project's autoload to analyze type of elements**, it cannot be installed as project in standalone directory but **needs to be added as dependency**. Here [`bamarni/composer-bin-plugin`](https://github.com/bamarni/composer-bin-plugin) becomes useful:
 
 ```bash
@@ -51,7 +49,7 @@ composer require bamarni/composer-bin-plugin --dev
 Then, require Rector using `composer bin`:
 
 ```bash
-composer bin rector require --dev rector/rector:'dev-master' nikic/php-parser:'4.0.x-dev'
+composer bin rector require --dev rector/rector:'dev-master'
 ```
 
 And Rector is accessible as:
diff --git a/composer.json b/composer.json
index 61aa85253d1b..274641c57bf0 100644
--- a/composer.json
+++ b/composer.json
@@ -12,10 +12,10 @@
         "jean85/pretty-package-versions": "^1.1",
         "nette/robot-loader": "^3.0",
         "nette/utils": "^2.5",
-        "nikic/php-parser": "4.0.x-dev",
+        "nikic/php-parser": "^4.0",
         "phpdocumentor/reflection-docblock": "^4.3",
         "phpdocumentor/type-resolver": "^0.4",
-        "rector/better-reflection": "^3.0.6",
+        "roave/better-reflection": "dev-master",
         "sebastian/diff": "^3.0",
         "symfony/console": "^4.0",
         "symfony/dependency-injection": "^4.0",