diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4a7ac6d..2f094fc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        php-version: ['8.3', '8.4', '8.5']
+        php-version: ['8.4', '8.5']
       fail-fast: false
 
     steps:
diff --git a/composer.json b/composer.json
index d1277c0..2300cc7 100644
--- a/composer.json
+++ b/composer.json
@@ -3,8 +3,11 @@
     "description": "Declarative rule engine for conversational agents and interactive workflows",
     "type": "library",
     "require": {
-        "php": "~8.3.0 || ~8.4.0 || ~8.5.0",
-        "php-standard-library/php-standard-library": "^4.2 || ^5.0"
+        "php": "~8.4.0 || ~8.5.0",
+        "php-standard-library/foundation": "^6.1",
+        "php-standard-library/graph": "^6.1",
+        "php-standard-library/iter": "^6.1",
+        "php-standard-library/vec": "^6.1"
     },
     "license": "MIT",
     "autoload": {