diff --git a/app/config/variables.php b/app/config/variables.php
index 5dd7196266..46a6c7d1e2 100644
--- a/app/config/variables.php
+++ b/app/config/variables.php
@@ -37,7 +37,7 @@ return [
             [
                 'name' => '_APP_LOCKING_ENABLED',
                 'description' => 'Enable distributed locking for platform writes. Locks coordinate concurrent updates across API pods so that read-modify-write operations on shared documents do not lose updates. By default, set to \'enabled\'. Set to \'disabled\' as an emergency kill switch — locks become no-ops (fail-open) and concurrent writes will race.',
-                'introduction' => '1.10.0',
+                'introduction' => '1.9.3',
                 'default' => 'enabled',
                 'required' => false,
                 'question' => '',
diff --git a/app/init/resources.php b/app/init/resources.php
index 4c3a684d4e..d3443ee337 100644
--- a/app/init/resources.php
+++ b/app/init/resources.php
@@ -325,10 +325,12 @@ $container->set('distributedLockOrFail', function (\Redis $redis, Telemetry $tel
 
         if (! $acquired) {
             $attempts->add(1, ['outcome' => 'contended', 'target' => $target]);
-            throw new AppwriteException(
-                AppwriteException::GENERAL_RESOURCE_LOCKED,
-                "Resource '{$key}' is currently being modified by another request. Please retry."
-            );
+            // Don't pass a custom message — the catalog message in
+            // app/config/errors.php is reused so we don't leak the internal
+            // lock key (which embeds collection name and document id) into a
+            // user-facing 409 response. The telemetry attribute already
+            // carries the target collection for operator-side observability.
+            throw new AppwriteException(AppwriteException::GENERAL_RESOURCE_LOCKED);
         }
 
         $attempts->add(1, ['outcome' => 'acquired', 'target' => $target]);
diff --git a/src/Appwrite/Platform/Modules/Project/Http/Project/Services/Update.php b/src/Appwrite/Platform/Modules/Project/Http/Project/Services/Update.php
index e7b048b734..1126da8897 100644
--- a/src/Appwrite/Platform/Modules/Project/Http/Project/Services/Update.php
+++ b/src/Appwrite/Platform/Modules/Project/Http/Project/Services/Update.php
@@ -81,7 +81,7 @@ class Update extends Action
         // the read-modify-write window; re-read inside the lock so the
         // baseline reflects any update that landed between request init
         // and lock acquisition.
-        $project = $distributedLockOrFail("platform:project:{$project->getId()}", function () use ($project, $serviceId, $enabled, $dbForPlatform, $authorization) {
+        $project = $distributedLockOrFail("lock:platform:projects:{$project->getId()}", function () use ($project, $serviceId, $enabled, $dbForPlatform, $authorization) {
             $project = $authorization->skip(fn () => $dbForPlatform->getDocument('projects', $project->getId()));
 
             $services = $project->getAttribute('services', []);