diff --git a/.composer.pman.yml b/.composer.pman.yml
index 5d33807..16d4d3e 100644
--- a/.composer.pman.yml
+++ b/.composer.pman.yml
@@ -5,8 +5,8 @@ composer:
   dev:
     link: true
     require:
-      nulib/php: ^8.2-dev
+      nulib/base: ^8.2-dev
   dist:
     link: false
     require:
-      nulib/php: ^0.5.0p82
+      nulib/base: ^0.5.0p82
diff --git a/CHANGES.md b/CHANGES.md
index a257870..d043827 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,7 @@
+## Release 0.6.0p74 du 30/05/2025-23:18
+
+* `824c1ec` migration de nulib/php à nulib/base
+
 ## Release 0.5.0p82 du 30/04/2025-04:48
 
 ## Release 0.5.0p74 du 30/04/2025-04:46
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..063aa21
--- /dev/null
+++ b/README.md
@@ -0,0 +1,49 @@
+# nulib-phpss
+
+
+## Release
+
+Exemple: release de la version 0.6.0
+
+Avant de faire une release majeure sur nulib/phpss, faire d'abord la release
+majeure correspondante sur
+* nulib/base
+
+~~~sh
+version=0.6.0
+
+major="${version%.*}.0"
+
+## branche dev74
+git checkout dev74
+
+sed -ri "\
+/nulib\/.*:/s/[0-9]+.[0-9]+.0p74/${major}p74/
+" .composer.pman.yml
+pci "maj projet"
+
+prel -v$version
+
+# en cas de conflit, sélectionner HEAD
+_merge82
+
+## branche dev82
+git checkout dev82
+
+sed -ri "\
+/nulib\/.*:/s/[0-9]+.[0-9]+.0p82/${major}p82/
+" .composer.pman.yml
+pci "maj projet"
+
+prel -C
+
+commit="$(git log --grep="Init changelog . version ${version}p82" --format=%H)" &&
+echo "commit=$commit"
+
+git checkout dev74
+
+git cherry-pick "$commit"
+pp -a
+~~~
+
+-*- coding: utf-8 mode: markdown -*- vim:sw=4:sts=4:et:ai:si:sta:fenc=utf-8:noeol:binary
\ No newline at end of file
diff --git a/VERSION.txt b/VERSION.txt
index 8f0916f..a918a2a 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-0.5.0
+0.6.0
diff --git a/composer.json b/composer.json
index f70c7b5..ab15a46 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
 	"repositories": [
 		{
 			"type": "path",
-			"url": "../nulib"
+			"url": "../nulib-base"
 		},
 		{
 			"type": "composer",
diff --git a/composer.lock b/composer.lock
index ca965af..18fcc94 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "34445aa6f912ea531f9bda732789af63",
+    "content-hash": "6dc1632c00c3a9480171d34a2976d8f5",
     "packages": [
         {
             "name": "composer/pcre",
@@ -271,18 +271,84 @@
             "time": "2022-12-02T22:17:43+00:00"
         },
         {
-            "name": "nulib/php",
-            "version": "dev-dev82",
+            "name": "myclabs/php-enum",
+            "version": "1.8.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/php-enum.git",
+                "reference": "e7be26966b7398204a234f8673fdad5ac6277802"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/php-enum/zipball/e7be26966b7398204a234f8673fdad5ac6277802",
+                "reference": "e7be26966b7398204a234f8673fdad5ac6277802",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "php": "^7.3 || ^8.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.5",
+                "squizlabs/php_codesniffer": "1.*",
+                "vimeo/psalm": "^4.6.2 || ^5.2"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "MyCLabs\\Enum\\": "src/"
+                },
+                "classmap": [
+                    "stubs/Stringable.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP Enum contributors",
+                    "homepage": "https://github.com/myclabs/php-enum/graphs/contributors"
+                }
+            ],
+            "description": "PHP Enum implementation",
+            "homepage": "https://github.com/myclabs/php-enum",
+            "keywords": [
+                "enum"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/php-enum/issues",
+                "source": "https://github.com/myclabs/php-enum/tree/1.8.5"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/mnapoli",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/php-enum",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-01-14T11:49:03+00:00"
+        },
+        {
+            "name": "nulib/base",
+            "version": "dev-dev74",
             "dist": {
                 "type": "path",
-                "url": "../nulib",
-                "reference": "a8094658d8ae21c9e66fba3120b9efede4d54ce7"
+                "url": "../nulib-base",
+                "reference": "a319baec05c4022edc07f738a9f4cbad3e486b82"
             },
             "require": {
                 "ext-json": "*",
                 "php": "^8.2",
                 "symfony/yaml": "^7.1"
             },
+            "replace": {
+                "nulib/php": "<0.6.0"
+            },
             "require-dev": {
                 "ext-curl": "*",
                 "ext-pcntl": "*",
@@ -705,7 +771,7 @@
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "v1.31.0",
+            "version": "v1.32.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
@@ -764,7 +830,7 @@
                 "portable"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.31.0"
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.32.0"
             },
             "funding": [
                 {
@@ -782,6 +848,87 @@
             ],
             "time": "2024-09-09T11:45:10+00:00"
         },
+        {
+            "name": "symfony/polyfill-mbstring",
+            "version": "v1.32.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
+                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/6d857f4d76bd4b343eac26d6b539585d2bc56493",
+                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493",
+                "shasum": ""
+            },
+            "require": {
+                "ext-iconv": "*",
+                "php": ">=7.2"
+            },
+            "provide": {
+                "ext-mbstring": "*"
+            },
+            "suggest": {
+                "ext-mbstring": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Mbstring\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for the Mbstring extension",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "mbstring",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.32.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-12-23T08:48:59+00:00"
+        },
         {
             "name": "symfony/yaml",
             "version": "v7.2.5",
@@ -1453,16 +1600,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "10.5.45",
+            "version": "9.6.23",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "bd68a781d8e30348bc297449f5234b3458267ae8"
+                "reference": "43d2cb18d0675c38bd44982a5d1d88f6d53d8d95"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/bd68a781d8e30348bc297449f5234b3458267ae8",
-                "reference": "bd68a781d8e30348bc297449f5234b3458267ae8",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/43d2cb18d0675c38bd44982a5d1d88f6d53d8d95",
+                "reference": "43d2cb18d0675c38bd44982a5d1d88f6d53d8d95",
                 "shasum": ""
             },
             "require": {
@@ -1472,7 +1619,7 @@
                 "ext-mbstring": "*",
                 "ext-xml": "*",
                 "ext-xmlwriter": "*",
-                "myclabs/deep-copy": "^1.12.1",
+                "myclabs/deep-copy": "^1.13.1",
                 "phar-io/manifest": "^2.0.4",
                 "phar-io/version": "^3.2.1",
                 "php": ">=8.1",
@@ -1534,7 +1681,7 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
                 "security": "https://github.com/sebastianbergmann/phpunit/security/policy",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/10.5.45"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.6.23"
             },
             "funding": [
                 {
@@ -1545,12 +1692,20 @@
                     "url": "https://github.com/sebastianbergmann",
                     "type": "github"
                 },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
                 {
                     "url": "https://tidelift.com/funding/github/packagist/phpunit/phpunit",
                     "type": "tidelift"
                 }
             ],
-            "time": "2025-02-06T16:08:12+00:00"
+            "time": "2025-05-02T06:40:34+00:00"
         },
         {
             "name": "sebastian/cli-parser",
@@ -2522,7 +2677,7 @@
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {
-        "nulib/php": 20
+        "nulib/base": 20
     },
     "prefer-stable": false,
     "prefer-lowest": false,