diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bc7a054..6a9717e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -89,13 +89,19 @@ jobs:
       - name: Run psalm
         if: ${{ matrix.os != 'windows-latest' }}
         run: vendor/bin/psalm
-      - name: Run phan
+      - name: Install and run phan
         if: ${{ matrix.os != 'windows-latest' }}
-        run: vendor/bin/phan
+        run: |
+          rm composer.lock
+          composer require ${{ matrix.dependencies_level }} --dev phan/phan:^5.4.5
+          vendor/bin/phan
       # AST 1.1 binary for Windows seems to be missing on PECL
-      - name: Run phan with polyfill
+      - name: Install and run phan with polyfill
         if: ${{ matrix.os == 'windows-latest' }}
-        run: vendor/bin/phan --allow-polyfill-parser
+        run: |
+          rm composer.lock
+          composer require  ${{ matrix.dependencies_level }} --dev phan/phan:^5.4.5
+          vendor/bin/phan --allow-polyfill-parser
       - name: Run tests with coverage
         if: ${{ matrix.os != 'windows-latest' && matrix.php_version == '8.1' && matrix.dependencies_level != '--prefer-lowest' }}
         run: php vendor/bin/phpunit --coverage-clover=coverage.xml --coverage-cobertura=cobertura.xml --log-junit=junit.xml
diff --git a/.phan/config.php b/.phan/config.php
index 48d2cfc..d91abd2 100644
--- a/.phan/config.php
+++ b/.phan/config.php
@@ -22,8 +22,7 @@
     'directory_list' => [
         'MO4',
         'tests',
-        'vendor/squizlabs/php_codesniffer',
-        'vendor/symfony/polyfill-php83',
+        'vendor',
     ],
 
     // A directory list that defines files that will be excluded
@@ -38,6 +37,6 @@
     //       should be added to both the `directory_list`
     //       and `exclude_analysis_directory_list` arrays.
     "exclude_analysis_directory_list" => [
-        'vendor/'
+        'vendor/',
     ],
 ];
diff --git a/MO4/Library/PregLibrary.php b/MO4/Library/PregLibrary.php
index e32445e..5925dc0 100644
--- a/MO4/Library/PregLibrary.php
+++ b/MO4/Library/PregLibrary.php
@@ -16,6 +16,9 @@
 
 use PHP_CodeSniffer\Exceptions\RuntimeException;
 
+/**
+ * @psalm-api
+ */
 final class PregLibrary
 {
     /**
diff --git a/composer.json b/composer.json
index c59be4e..afc89cd 100644
--- a/composer.json
+++ b/composer.json
@@ -32,12 +32,10 @@
     "require-dev": {
         "ergebnis/composer-normalize": "^2.45",
         "nikic/php-parser": "< 5.0.1",
-        "phan/phan": "^5.4.5",
         "phpstan/phpstan": "^2.0",
         "phpstan/phpstan-strict-rules": "^2.0",
         "phpunit/phpunit": "^9.6.15",
         "psalm/plugin-phpunit": "^0.19",
-        "sabre/event": ">= 5.1.6",
         "symfony/filesystem": ">= 5.4.45",
         "symfony/polyfill-php83": "^1.32",
         "vimeo/psalm": "^6.0.0"