diff --git a/composer.json b/composer.json
index 1a3b81a..4515fb5 100644
--- a/composer.json
+++ b/composer.json
@@ -8,6 +8,7 @@
         "php": "^8.0",
         "picocms/pico": "dev-fix-compatibility-php8 as v3.0.0-alpha.2",
         "seacms/app": "dev-master",
+        "seacms/composer-plugin": "dev-master",
         "seacms/seacms-theme": "dev-master"
     },
     "config": {
@@ -19,7 +20,8 @@
         "sort-packages": true,
         "allow-plugins": {
             "picocms/composer-installer": true,
-            "topfloor/composer-cleanup-vcs-dirs": false
+            "topfloor/composer-cleanup-vcs-dirs": false,
+            "seacms/composer-plugin": true
         }
     },
     "extra": {
@@ -37,41 +39,8 @@
     "archive": {
         "exclude": ["node_modules","/archives","/*.zip","/*.gz","/*.bz2"]
     },
-    "repositories": [
-        {
-            "type": "path",
-            "url": "../seacms-app",
-            "options": {
-                "name": "seacms/seacms-app",
-                "versions": {
-                    "seacms/seacms-app": "dev-master",
-                    "symlink": true
-                }
-            }
-        },
-        {
-            "type": "path",
-            "url": "../pico-content-editor",
-            "options": {
-                "name": "seacms/pico-content-editor",
-                "versions": {
-                    "seacms/pico-content-editor": "dev-master",
-                    "symlink": true
-                }
-            }
-        },
-        {
-            "type": "path",
-            "url": "../seacms-theme",
-            "options": {
-                "name": "seacms/seacms-theme",
-                "versions": {
-                    "seacms/seacms-theme": "dev-master",
-                    "symlink": true
-                }
-            }
-        },
-        {
+    "repositories": {
+        "picocms/pico": {
             "type": "path",
             "url": "../pico",
             "options": {
@@ -82,7 +51,7 @@
                 }
             }
         },
-        {
+        "seacms/seacms-api": {
             "type": "path",
             "url": "../seacms-api",
             "options": {
@@ -92,8 +61,19 @@
                     "symlink": true
                 }
             }
-        }, 
-        {
+        },
+        "seacms/seacms-app": {
+            "type": "path",
+            "url": "../seacms-app",
+            "options": {
+                "name": "seacms/seacms-app",
+                "versions": {
+                    "seacms/seacms-app": "dev-master",
+                    "symlink": true
+                }
+            }
+        },
+        "seacms/seacms-auth": {
             "type": "path",
             "url": "../seacms-auth",
             "options": {
@@ -103,6 +83,39 @@
                     "symlink": true
                 }
             }
+        },
+        "seacms/composer-plugin": {
+            "type": "path",
+            "url": "../composer-plugin",
+            "options": {
+                "name": "seacms/composer-plugin",
+                "versions": {
+                    "seacms/composer-plugin": "dev-master",
+                    "symlink": true
+                }
+            }
+        },
+        "seacms/pico-content-editor": {
+            "type": "path",
+            "url": "../pico-content-editor",
+            "options": {
+                "name": "seacms/pico-content-editor",
+                "versions": {
+                    "seacms/pico-content-editor": "dev-master",
+                    "symlink": true
+                }
+            }
+        },
+        "seacms/seacms-theme": {
+            "type": "path",
+            "url": "../seacms-theme",
+            "options": {
+                "name": "seacms/seacms-theme",
+                "versions": {
+                    "seacms/seacms-theme": "dev-master",
+                    "symlink": true
+                }
+            }
         }
-    ]
+    }
 }
diff --git a/composer.lock b/composer.lock
index 5a57622..ce9a96c 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": "ca7ae09d4583642f355da888629c686f",
+    "content-hash": "9a32b0ec8335523b4a2efbbd4e8f8389",
     "packages": [
         {
             "name": "erusev/parsedown",
@@ -333,10 +333,9 @@
             "dist": {
                 "type": "path",
                 "url": "../seacms-app",
-                "reference": "38dea6765b59940e276884619f059ca990af9057"
+                "reference": "f0c54299bbd5bf6b372e1f6275d3ac2d0ce51619"
             },
             "require": {
-                "composer": "^2.4",
                 "ext-dom": "*",
                 "ext-filter": "*",
                 "ext-json": "*",
@@ -390,18 +389,68 @@
                 "relative": true
             }
         },
+        {
+            "name": "seacms/composer-plugin",
+            "version": "dev-master",
+            "dist": {
+                "type": "path",
+                "url": "../composer-plugin",
+                "reference": "4826be297c84d7ac37796e7e923b61910c939b60"
+            },
+            "require": {
+                "composer-plugin-api": "^2.3",
+                "topfloor/composer-cleanup-vcs-dirs": "^1.1"
+            },
+            "replace": {
+                "symfony/finder": "*"
+            },
+            "type": "composer-plugin",
+            "extra": {
+                "class": "Seacms\\ComposerInstaller\\Plugin"
+            },
+            "autoload": {
+                "psr-4": {
+                    "Seacms\\ComposerInstaller\\": "src"
+                }
+            },
+            "license": [
+                "EUPL-1.2"
+            ],
+            "authors": [
+                {
+                    "name": "Jérémy Dufraisse",
+                    "homepage": "https://github.com/J9rem",
+                    "role": "SeaCMS developer"
+                }
+            ],
+            "description": "Composer plugin SeaCMS",
+            "homepage": "https://git.defis.info/SeaCMS/composer-plugin",
+            "keywords": [
+                "composer-plugin",
+                "seacma"
+            ],
+            "support": {
+                "docs": "https://git.defis.info/SeaCMS/composer-plugin/src/branch/master/README.md",
+                "issues": "https://git.defis.info/SeaCMS/composer-plugin/issues",
+                "source": "https://git.defis.info/SeaCMS/composer-plugin"
+            },
+            "transport-options": {
+                "relative": true
+            }
+        },
         {
             "name": "seacms/pico-content-editor",
             "version": "dev-master",
             "dist": {
                 "type": "path",
                 "url": "../pico-content-editor",
-                "reference": "1258377ed81edc492f1b7fb79cf76f18ab65a7fc"
+                "reference": "da5ed742f3eb4e4af466eb278754168715ec8b8d"
             },
             "require": {
                 "php": "^8.0",
                 "pixel418/markdownify": "^2.3",
-                "seacms/seacms-api": "dev-master"
+                "seacms/seacms-api": "dev-master",
+                "seacms/seacms-auth": "dev-master"
             },
             "type": "pico-plugin",
             "autoload": {
@@ -503,7 +552,7 @@
             "dist": {
                 "type": "path",
                 "url": "../seacms-auth",
-                "reference": "245487ad7ffab6643360f0f87a72ca3710c4a7e8"
+                "reference": "eef1cad3ccb4deda8f9fbccf01880e0040be3c97"
             },
             "require": {
                 "php": "^8.0",
@@ -548,7 +597,7 @@
             "dist": {
                 "type": "path",
                 "url": "../seacms-theme",
-                "reference": "89dfb914e435c91327fbeab11b05c9594fc9201f"
+                "reference": "7e0717491f77b2e7b2716e903b07a808178fe52d"
             },
             "require": {
                 "seacms/app": "dev-master",
@@ -886,6 +935,48 @@
             ],
             "time": "2020-10-24T10:57:07+00:00"
         },
+        {
+            "name": "topfloor/composer-cleanup-vcs-dirs",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/VolantisDev/composer-cleanup-vcs-dirs.git",
+                "reference": "dfa7c8c0fe22e048310d00f133f7df14f0b2f57a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/VolantisDev/composer-cleanup-vcs-dirs/zipball/dfa7c8c0fe22e048310d00f133f7df14f0b2f57a",
+                "reference": "dfa7c8c0fe22e048310d00f133f7df14f0b2f57a",
+                "shasum": ""
+            },
+            "require": {
+                "composer-plugin-api": "^1 | ^2",
+                "php": ">=5.5",
+                "symfony/finder": "*"
+            },
+            "require-dev": {
+                "composer/composer": "dev-master"
+            },
+            "type": "composer-plugin",
+            "extra": {
+                "class": "TopFloor\\ComposerCleanupVcsDirs\\Plugin"
+            },
+            "autoload": {
+                "psr-4": {
+                    "TopFloor\\ComposerCleanupVcsDirs\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "GPL-2.0+"
+            ],
+            "description": "Automatically deletes .git directories in newly installed or updated dependencies.",
+            "support": {
+                "issues": "https://github.com/VolantisDev/composer-cleanup-vcs-dirs/issues",
+                "source": "https://github.com/VolantisDev/composer-cleanup-vcs-dirs/tree/1.1.0"
+            },
+            "time": "2021-07-09T16:11:23+00:00"
+        },
         {
             "name": "twig/twig",
             "version": "v2.15.4",
@@ -980,6 +1071,7 @@
     "stability-flags": {
         "picocms/pico": 20,
         "seacms/app": 20,
+        "seacms/composer-plugin": 20,
         "seacms/seacms-theme": 20
     },
     "prefer-stable": true,