diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5d03dedaf..4fc17d41a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
           - "8.2"
           - "8.3"
           - "8.4"
-#          - "8.5"
+          - "8.5"
 
     env:
       PHAN_ALLOW_XDEBUG: 0
@@ -45,7 +45,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-version }}
-          extensions: ast, ${{ env.PHP_EXTENSIONS }}
+          extensions: ast-1.1.3, var_representation, ${{ env.PHP_EXTENSIONS }}
           ini-values: ${{ env.PHP_INI_VALUES }}
           coverage: none
 
diff --git a/composer.json b/composer.json
index 49c7f0059..61e33977b 100644
--- a/composer.json
+++ b/composer.json
@@ -54,7 +54,7 @@
 	"require-dev": {
 		"ext-fileinfo": "*",
 		"chillerlan/php-authenticator": "^4.3.1 || ^5.2.1",
-		"phan/phan": "^5.5.1",
+		"phan/phan": "^5.5.1 || 6.0.0-beta",
 		"phpcompatibility/php-compatibility": "10.x-dev",
 		"phpunit/phpunit": "^9.6",
 		"phpmd/phpmd": "^2.15",