diff --git a/.github/workflows/analyzers.yaml b/.github/workflows/analyzers.yaml
index e8b7968..707dc2f 100644
--- a/.github/workflows/analyzers.yaml
+++ b/.github/workflows/analyzers.yaml
@@ -12,7 +12,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['8.3', '8.4', '8.5']
+                php-versions: ['8.4', '8.5']
                 composer-options: ['--ignore-platform-req=php+']
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} @ ${{ matrix.operating-system }}
diff --git a/.github/workflows/code-style.yaml b/.github/workflows/code-style.yaml
index a7002b4..434ab13 100644
--- a/.github/workflows/code-style.yaml
+++ b/.github/workflows/code-style.yaml
@@ -11,7 +11,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['8.3', '8.4', '8.5']
+                php-versions: ['8.4', '8.5']
                 composer-options: ['--ignore-platform-req=php+']
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} @ ${{ matrix.operating-system }}
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 755a451..802c023 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -12,7 +12,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['8.3', '8.4', '8.5']
+                php-versions: ['8.4', '8.5']
                 composer-options: ['--ignore-platform-req=php+']
                 experimental: [false]
             fail-fast: false
diff --git a/composer.json b/composer.json
index 08bbe1b..514f5f1 100644
--- a/composer.json
+++ b/composer.json
@@ -47,10 +47,16 @@
         }
     ],
     "require": {
-        "php": "~8.3.0 || ~8.4.0 || ~8.5.0",
-        "php-standard-library/php-standard-library": "^3.0 || ~4.0 || ^5.0 || ^6.0"
+        "php": "~8.4.0 || ~8.5.0",
+        "php-standard-library/dict": "^6.1",
+        "php-standard-library/foundation": "^6.1",
+        "php-standard-library/iter": "^6.1",
+        "php-standard-library/option": "^6.1",
+        "php-standard-library/result": "^6.1",
+        "php-standard-library/vec": "^6.1"
     },
     "require-dev": {
+        "php-standard-library/fun": "^6.1",
         "vimeo/psalm": "~6.13",
         "phpunit/phpunit": "~12.3",
         "php-cs-fixer/shim": "~3.88",