diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 879c966..204e19d 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -17,6 +17,7 @@ jobs:
         - '8.2'
         - '8.3'
         - '8.4'
+        - '8.5'
     steps:
       - uses: shivammathur/setup-php@v2
         with:
diff --git a/composer.json b/composer.json
index b97639d..dd5ebc5 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     "keywords": [ "x690", "x.690", "x.509", "x509", "asn1", "asn.1", "ber", "der", "binary", "encoding", "decoding" ],
 
     "require": {
-        "php": "~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.0"
+        "php": "~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.0 || ~8.5.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.0",