diff --git a/database/migrations/0000_00_00_163912_create_institutes_table.php b/database/migrations/0000_00_00_163912_create_institutes_table.php
index 490e7b6..9d4d28f 100644
--- a/database/migrations/0000_00_00_163912_create_institutes_table.php
+++ b/database/migrations/0000_00_00_163912_create_institutes_table.php
@@ -10,7 +10,7 @@ public function up(): void
     {
         Schema::create('institutes', function (Blueprint $table) {
             $table->id();
-            $table->uuid('guid')->unique()->index()->default(DB::raw('uuid_generate_v4()'));
+            $table->uuid('guid')->unique()->index()->default(DB::raw("concat('INS-', gen_random_uuid())"));
             $table->string('name')->unique();
             $table->boolean('is_active')->default(false);
             $table->string('address')->nullable();
diff --git a/database/migrations/0000_01_31_075136_create_facilities_table.php b/database/migrations/0000_01_31_075136_create_facilities_table.php
index 2a5341b..501cc85 100644
--- a/database/migrations/0000_01_31_075136_create_facilities_table.php
+++ b/database/migrations/0000_01_31_075136_create_facilities_table.php
@@ -10,7 +10,7 @@ public function up(): void
     {
         Schema::create('facilities', function (Blueprint $table) {
             $table->id();
-            $table->uuid('guid')->unique()->index()->default(DB::raw('uuid_generate_v4()'));
+            $table->uuid('guid')->unique()->index()->default(DB::raw("concat('FAC-', gen_random_uuid())"));
             $table->boolean('is_active')->default(false);
             $table->foreignId('institute_id')->constrained('institutes')->cascadeOnDelete();
             $table->string('name');
diff --git a/database/migrations/0001_01_01_000000_create_users_table.php b/database/migrations/0001_01_01_000000_create_users_table.php
index 3e00dde..f34c730 100644
--- a/database/migrations/0001_01_01_000000_create_users_table.php
+++ b/database/migrations/0001_01_01_000000_create_users_table.php
@@ -12,7 +12,7 @@ public function up(): void
     {
         Schema::create('users', function (Blueprint $table) {
             $table->id();
-            $table->uuid('guid')->unique()->index()->default(DB::raw('uuid_generate_v4()'));
+            $table->uuid('guid')->unique()->index()->default(DB::raw("concat('USR-', gen_random_uuid())"));
             $table->boolean('is_active')->default(true);
             $table->string('first_name');
             $table->string('last_name')->nullable();