diff --git a/CHANGELOG.md b/CHANGELOG.md
index 960af12..6560193 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,18 @@ Todas as mudanças relevantes deste plugin são documentadas aqui.
 O formato segue [Keep a Changelog](https://keepachangelog.com/pt-BR/1.0.0/)
 e o versionamento segue [SemVer](https://semver.org/lang/pt-BR/).
 
+## [1.5.3]
+
+### Corrigido
+- **Vínculo gravava o ID errado do projeto Redmine**: o `merge` do Twig renumera
+  chaves inteiras, então o dropdown gravava o índice (posição) em vez do ID real
+  do projeto. As opções passam a ser montadas no PHP (preservam os IDs).
+
+### Adicionado
+- Botão **Desvincular** na aba Redmine (projeto e entidade) — antes só dava pra vincular.
+- A visão "vinculado" mostra o **nome** do projeto Redmine (não só o ID).
+- Dropdown de projetos lista **apenas projetos ativos** (evita vincular projeto fechado/arquivado).
+
 ## [1.5.2]
 
 ### Corrigido
diff --git a/front/entity.form.php b/front/entity.form.php
index a656cd9..6c5506f 100644
--- a/front/entity.form.php
+++ b/front/entity.form.php
@@ -35,6 +35,10 @@ if (isset($_POST["action"])) {
         ]);
         Session::addMessageAfterRedirect(__('Categoria padrão salva com sucesso!', 'redmine'));
     }
+    elseif ($action === 'unlink') {
+        $DB->delete('glpi_plugin_redmine_entities', ['entities_id' => $entities_id]);
+        Session::addMessageAfterRedirect(__('Entidade desvinculada do Redmine.', 'redmine'));
+    }
     elseif ($action === 'process') {
         $redmine_project_id = $_POST['redmine_project_id'] ?? '';
 
diff --git a/front/project.form.php b/front/project.form.php
index faaae51..1dab564 100644
--- a/front/project.form.php
+++ b/front/project.form.php
@@ -39,6 +39,11 @@ if (isset($_POST["action"])) {
         ]);
         Session::addMessageAfterRedirect("Categoria padrão salva com sucesso!");
     }
+    elseif ($action === 'unlink') {
+        global $DB;
+        $DB->delete('glpi_plugin_redmine_projects', ['projects_id' => $projects_id]);
+        Session::addMessageAfterRedirect("Projeto desvinculado do Redmine.");
+    }
     elseif ($action === 'process') {
         $redmine_project_id = $_POST['redmine_project_id'] ?? '';
         
diff --git a/inc/entity.class.php b/inc/entity.class.php
index 2889b4d..d167c20 100644
--- a/inc/entity.class.php
+++ b/inc/entity.class.php
@@ -34,6 +34,9 @@ class PluginRedmineEntity extends CommonDBTM {
         $entities_id = $entity->getID();
         $form_url    = $CFG_GLPI['root_doc'] . '/plugins/redmine/front/entity.form.php';
 
+        // {id: name} montado no PHP (Twig merge corrompe chaves inteiras).
+        $project_options = PluginRedmineProject::getRedmineProjectOptions();
+
         // Already linked?
         $iterator = $DB->request([
             'FROM'  => 'glpi_plugin_redmine_entities',
@@ -52,47 +55,30 @@ class PluginRedmineEntity extends CommonDBTM {
             }
 
             \Glpi\Application\View\TemplateRenderer::getInstance()->display('@redmine/project_linked.html.twig', [
-                'action_url'          => $form_url,
-                'owner_field'         => 'entities_id',
-                'owner_id'            => $entities_id,
-                'redmine_project_id'  => $redmineProjectId,
-                'cat_options'         => $cat_options,
-                'default_category_id' => (int) ($link['default_category_id'] ?? 0),
-                'csrf_token_value'    => Session::getNewCSRFToken(),
+                'action_url'           => $form_url,
+                'owner_field'          => 'entities_id',
+                'owner_id'             => $entities_id,
+                'redmine_project_id'   => $redmineProjectId,
+                'redmine_project_name' => $project_options[$redmineProjectId] ?? '',
+                'cat_options'          => $cat_options,
+                'default_category_id'  => (int) ($link['default_category_id'] ?? 0),
+                'csrf_token_value'     => Session::getNewCSRFToken(),
             ]);
             return;
         }
 
         // Not linked: show the link/create form (reuses the project tab template).
-        $config_it = $DB->request(['FROM' => 'glpi_plugin_redmine_configs', 'WHERE' => ['id' => 1]]);
-        $config = count($config_it) > 0 ? $config_it->current() : [];
-        $metadata = !empty($config['metadata_cache']) ? json_decode($config['metadata_cache'], true) : [];
-        $redmine_projects = $metadata['projects'] ?? [];
-
-        $modules = [
-            'issue_tracking' => 'Gerenciamento de Tarefas',
-            'time_tracking'  => 'Gerenciamento de tempo',
-            'news'           => 'Notícias',
-            'documents'      => 'Documentos',
-            'files'          => 'Arquivos',
-            'wiki'           => 'Wiki',
-            'repository'     => 'Repositório',
-            'boards'         => 'Fóruns',
-            'calendar'       => 'Calendário',
-            'gantt'          => 'Gantt'
-        ];
-
         $description = \Glpi\RichText\RichText::getTextFromHtml($entity->fields['comment'] ?? '', false, true, true);
 
         \Glpi\Application\View\TemplateRenderer::getInstance()->display('@redmine/project_form.html.twig', [
             'action_url'          => $form_url,
             'owner_field'         => 'entities_id',
             'owner_id'            => $entities_id,
-            'redmine_projects'    => $redmine_projects,
+            'project_options'     => PluginRedmineProject::getRedmineProjectOptions(true),
             'project_name'        => $entity->fields['name'],
             'project_description' => $description,
             'project_identifier'  => 'glpi-ent-' . $entities_id,
-            'modules'             => $modules,
+            'modules'             => PluginRedmineProject::getModules(),
             'csrf_token_value'    => Session::getNewCSRFToken()
         ]);
     }
diff --git a/inc/project.class.php b/inc/project.class.php
index d52b3f2..2f7390e 100644
--- a/inc/project.class.php
+++ b/inc/project.class.php
@@ -32,8 +32,13 @@ class PluginRedmineProject extends CommonDBTM {
         global $DB, $CFG_GLPI;
 
         $projects_id = $project->getID();
+        $form_url    = $CFG_GLPI['root_doc'] . '/plugins/redmine/front/project.form.php';
 
-        // Check if already linked
+        // Build {id: name} of Redmine projects from cache IN PHP (Twig's merge
+        // renumbers integer keys, which corrupts the option values).
+        $project_options = self::getRedmineProjectOptions();
+
+        // Already linked?
         $iterator = $DB->request([
             'FROM' => 'glpi_plugin_redmine_projects',
             'WHERE' => ['projects_id' => $projects_id]
@@ -43,7 +48,6 @@ class PluginRedmineProject extends CommonDBTM {
             $link = $iterator->current();
             $redmineProjectId = (int) $link['redmine_project_id'];
 
-            // Issue categories are per Redmine project.
             $cat_options = [];
             foreach (PluginRedmineRedmineapi::getProjectCategories($redmineProjectId) as $c) {
                 if (isset($c['id'], $c['name'])) {
@@ -52,55 +56,73 @@ class PluginRedmineProject extends CommonDBTM {
             }
 
             \Glpi\Application\View\TemplateRenderer::getInstance()->display('@redmine/project_linked.html.twig', [
-                'action_url'          => $CFG_GLPI['root_doc'] . '/plugins/redmine/front/project.form.php',
-                'owner_field'         => 'projects_id',
-                'owner_id'            => $projects_id,
-                'redmine_project_id'  => $redmineProjectId,
-                'cat_options'         => $cat_options,
-                'default_category_id' => (int) ($link['default_category_id'] ?? 0),
-                'csrf_token_value'    => Session::getNewCSRFToken(),
+                'action_url'           => $form_url,
+                'owner_field'          => 'projects_id',
+                'owner_id'             => $projects_id,
+                'redmine_project_id'   => $redmineProjectId,
+                'redmine_project_name' => $project_options[$redmineProjectId] ?? '',
+                'cat_options'          => $cat_options,
+                'default_category_id'  => (int) ($link['default_category_id'] ?? 0),
+                'csrf_token_value'     => Session::getNewCSRFToken(),
             ]);
             return;
         }
 
-        // Fetch Redmine Metadata Cache
-        $config_it = $DB->request(['FROM' => 'glpi_plugin_redmine_configs', 'WHERE' => ['id' => 1]]);
-        $config = count($config_it) > 0 ? $config_it->current() : [];
-        $metadata = [];
-        if (!empty($config['metadata_cache'])) {
-            $metadata = json_decode($config['metadata_cache'], true);
-        }
-
-        $redmine_projects = $metadata['projects'] ?? [];
-
-        $modules = [
-            'issue_tracking' => 'Gerenciamento de Tarefas',
-            'time_tracking' => 'Gerenciamento de tempo',
-            'news' => 'Notícias',
-            'documents' => 'Documentos',
-            'files' => 'Arquivos',
-            'wiki' => 'Wiki',
-            'repository' => 'Repositório',
-            'boards' => 'Fóruns',
-            'calendar' => 'Calendário',
-            'gantt' => 'Gantt'
-        ];
-
-        // Strip HTML from description
         $description = \Glpi\RichText\RichText::getTextFromHtml($project->fields['content'], false, true, true);
 
-        global $DB, $CFG_GLPI;
-
         \Glpi\Application\View\TemplateRenderer::getInstance()->display('@redmine/project_form.html.twig', [
-            'action_url' => $CFG_GLPI['root_doc'] . '/plugins/redmine/front/project.form.php',
-            'owner_field' => 'projects_id',
-            'owner_id' => $projects_id,
-            'redmine_projects' => $redmine_projects,
-            'project_name' => $project->fields['name'],
+            'action_url'          => $form_url,
+            'owner_field'         => 'projects_id',
+            'owner_id'            => $projects_id,
+            'project_options'     => self::getRedmineProjectOptions(true),
+            'project_name'        => $project->fields['name'],
             'project_description' => $description,
-            'project_identifier' => 'glpi-proj-' . $projects_id,
-            'modules' => $modules,
-            'csrf_token_value' => Session::getNewCSRFToken()
+            'project_identifier'  => 'glpi-proj-' . $projects_id,
+            'modules'             => self::getModules(),
+            'csrf_token_value'    => Session::getNewCSRFToken()
         ]);
     }
+
+    /**
+     * {id: name} map of the cached Redmine projects (PHP preserves integer keys).
+     * @return array
+     */
+    static function getRedmineProjectOptions($activeOnly = false) {
+        global $DB;
+        $it = $DB->request(['FROM' => 'glpi_plugin_redmine_configs', 'WHERE' => ['id' => 1]]);
+        $config = count($it) > 0 ? $it->current() : [];
+        $metadata = !empty($config['metadata_cache']) ? json_decode($config['metadata_cache'], true) : [];
+        $opts = [];
+        foreach (($metadata['projects'] ?? []) as $rp) {
+            if (!isset($rp['id'], $rp['name'])) {
+                continue;
+            }
+            // status: 1=ativo, 5=fechado, 9=arquivado. Issues só podem ser
+            // criadas em projetos ativos, então o dropdown só mostra esses.
+            if ($activeOnly && isset($rp['status']) && (int) $rp['status'] !== 1) {
+                continue;
+            }
+            $opts[$rp['id']] = $rp['name'];
+        }
+        return $opts;
+    }
+
+    /**
+     * Redmine project modules offered on creation.
+     * @return array
+     */
+    static function getModules() {
+        return [
+            'issue_tracking' => 'Gerenciamento de Tarefas',
+            'time_tracking'  => 'Gerenciamento de tempo',
+            'news'           => 'Notícias',
+            'documents'      => 'Documentos',
+            'files'          => 'Arquivos',
+            'wiki'           => 'Wiki',
+            'repository'     => 'Repositório',
+            'boards'         => 'Fóruns',
+            'calendar'       => 'Calendário',
+            'gantt'          => 'Gantt'
+        ];
+    }
 }
diff --git a/setup.php b/setup.php
index 4a6ae17..f2e775f 100644
--- a/setup.php
+++ b/setup.php
@@ -1,6 +1,6 @@
 <?php
 
-define('PLUGIN_REDMINE_VERSION', '1.5.2');
+define('PLUGIN_REDMINE_VERSION', '1.5.3');
 
 /**
  * Load the Mindplace License class if the autoloader has not run yet.
diff --git a/templates/project_form.html.twig b/templates/project_form.html.twig
index d7dd8db..8b9fc9b 100644
--- a/templates/project_form.html.twig
+++ b/templates/project_form.html.twig
@@ -5,11 +5,8 @@
     <input type="hidden" name="_glpi_csrf_token" value="{{ csrf_token_value }}">
     <input type="hidden" name="_glpi_simple_form" value="1">
 
-    {# Build a {id: name} options map from the cached Redmine projects #}
-    {% set rp_options = {} %}
-    {% for rp in redmine_projects %}
-        {% set rp_options = rp_options|merge({(rp.id): rp.name}) %}
-    {% endfor %}
+    {# project_options ({id: name}) é montado no PHP — não usar merge no Twig,
+       que renumera chaves inteiras e corrompe os valores das opções. #}
 
     <div class="card shadow-sm">
         <div class="card-header d-flex justify-content-between align-items-center">
@@ -25,7 +22,7 @@
             </div>
 
             <div class="row">
-                {{ fields.dropdownArrayField('redmine_project_id', '', rp_options, __('Vincular a Projeto Existente', 'redmine'), {
+                {{ fields.dropdownArrayField('redmine_project_id', '', project_options, __('Vincular a Projeto Existente', 'redmine'), {
                     'display_emptychoice': true,
                     'full_width': true
                 }) }}
@@ -51,7 +48,7 @@
                     'helper': __('Projetos públicos são visíveis para todos.', 'redmine')
                 }) }}
 
-                {{ fields.dropdownArrayField('parent_id', '', rp_options, __('Subprojeto de', 'redmine'), {
+                {{ fields.dropdownArrayField('parent_id', '', project_options, __('Subprojeto de', 'redmine'), {
                     'display_emptychoice': true,
                     'full_width': true
                 }) }}
diff --git a/templates/project_linked.html.twig b/templates/project_linked.html.twig
index 197d6d2..69de274 100644
--- a/templates/project_linked.html.twig
+++ b/templates/project_linked.html.twig
@@ -1,8 +1,20 @@
 {% import 'components/form/fields_macros.html.twig' as fields %}
 
-<div class="alert alert-success mt-3 d-flex align-items-center">
-    <i class="ti ti-link me-2"></i>
-    {{ __('Projeto vinculado à issue Redmine de ID', 'redmine') }} <strong class="ms-1">#{{ redmine_project_id }}</strong>
+<div class="alert alert-success mt-3 d-flex justify-content-between align-items-center">
+    <span>
+        <i class="ti ti-link me-2"></i>
+        {{ __('Vinculado ao projeto Redmine', 'redmine') }}
+        <strong class="ms-1">{{ redmine_project_name|default('') }} (#{{ redmine_project_id }})</strong>
+    </span>
+    <form method="post" action="{{ action_url }}" class="m-0"
+          onsubmit="return confirm('{{ __('Desvincular este projeto do Redmine?', 'redmine') }}');">
+        <input type="hidden" name="_glpi_csrf_token" value="{{ csrf_token_value }}">
+        <input type="hidden" name="{{ owner_field }}" value="{{ owner_id }}">
+        <input type="hidden" name="action" value="unlink">
+        <button type="submit" class="btn btn-sm btn-outline-danger">
+            <i class="ti ti-unlink me-1"></i>{{ __('Desvincular', 'redmine') }}
+        </button>
+    </form>
 </div>
 
 <form method="post" action="{{ action_url }}" class="mt-2">