diff --git a/composer.json b/composer.json
index 42fe5bf..78550c5 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "fleetbase/core-api",
-    "version": "1.6.43",
+    "version": "1.6.44",
     "description": "Core Framework and Resources for Fleetbase API",
     "keywords": [
         "fleetbase",
diff --git a/src/Http/Requests/UpdateUserRequest.php b/src/Http/Requests/UpdateUserRequest.php
index e676e2e..ad1fb77 100644
--- a/src/Http/Requests/UpdateUserRequest.php
+++ b/src/Http/Requests/UpdateUserRequest.php
@@ -4,6 +4,7 @@
 
 use Fleetbase\Rules\EmailDomainExcluded;
 use Fleetbase\Rules\ValidPhoneNumber;
+use Illuminate\Database\Eloquent\Model;
 use Illuminate\Validation\Rule;
 
 class UpdateUserRequest extends FleetbaseRequest
@@ -30,9 +31,12 @@ public function authorize()
      */
     public function rules()
     {
-        // Resolve the target user UUID from the route parameter so that the
-        // uniqueness rules can correctly ignore the user's own current value.
-        $userId = $this->route('id');
+        // REST routes generated by the custom registrar use the singular
+        // resource wildcard (e.g. `/users/{user}`), while some bespoke routes
+        // still use `{id}`. Support both so uniqueness rules correctly ignore
+        // the current user's own row during updates.
+        $userRouteParam = $this->route('user') ?? $this->route('id');
+        $userId         = $userRouteParam instanceof Model ? $userRouteParam->getKey() : $userRouteParam;
 
         return [
             'name'  => ['sometimes', 'required', 'string', 'min:2', 'max:100'],