diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 07eeae8..1009b3f 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -7,7 +7,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [ '7.4', '8.0', '8.1', '8.2' ]
+        php: [ '7.4', '8.0', '8.1', '8.2', '8.3' ]
 
     services:
       mysql:
@@ -39,7 +39,7 @@ jobs:
 
       - name: Run Psalm
         run: psalm --output-format=github
-        if: ${{ matrix.php == '8.2' }}
+        if: ${{ matrix.php == '8.3' }}
 
       - name: Run PHPUnit
         run: vendor/bin/phpunit
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 55c7e01..3847383 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.7.0] - 2023-09-27
+### Added
+- `writableId` bool property to optionally make the ID column writable.
+
 ## [2.6.0] - 2023-08-01
 ### Added
 - `output` bool parameter on `Prop` constructor.
@@ -142,7 +146,8 @@ return early if passed an empty IDs array.
 ### Changed
 - Initial stable release
 
-[Unreleased]: https://github.com/theodorejb/phaster/compare/v2.6.0...HEAD
+[Unreleased]: https://github.com/theodorejb/phaster/compare/v2.7.0...HEAD
+[2.7.0]: https://github.com/theodorejb/phaster/compare/v2.6.0...v2.7.0
 [2.6.0]: https://github.com/theodorejb/phaster/compare/v2.5.0...v2.6.0
 [2.5.0]: https://github.com/theodorejb/phaster/compare/v2.4.0...v2.5.0
 [2.4.0]: https://github.com/theodorejb/phaster/compare/v2.3.0...v2.4.0
diff --git a/composer.json b/composer.json
index de3ff95..4b0f577 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     "require-dev": {
         "phpunit/phpunit": "^9.6",
         "psalm/plugin-phpunit": "^0.18.4",
-        "vimeo/psalm": "^5.14"
+        "vimeo/psalm": "^5.15"
     },
     "autoload": {
         "psr-4": {"theodorejb\\Phaster\\": "src/"}
@@ -27,6 +27,9 @@
     "autoload-dev": {
         "psr-4": {"theodorejb\\Phaster\\Test\\": "test/"}
     },
+    "config": {
+        "sort-packages": true
+    },
     "scripts": {
         "analyze": "psalm",
         "test": "phpunit"
diff --git a/src/Entities.php b/src/Entities.php
index 6327294..745eae1 100644
--- a/src/Entities.php
+++ b/src/Entities.php
@@ -23,7 +23,8 @@ abstract class Entities
     abstract protected function getMap(): array;
 
     protected PeachySql $db;
-    protected string $idField = 'id';
+    public string $idField = 'id';
+    protected bool $writableId = false;
     private string $idColumn;
     /** @var array<string, Prop> */
     private array $fullPropMap;
@@ -56,7 +57,10 @@ public function __construct(PeachySql $db)
         if (isset($map[$this->idField])) {
             /** @psalm-suppress MixedAssignment */
             $this->idColumn = $map[$this->idField];
-            unset($map[$this->idField]); // prevent modifying identity column
+
+            if (!$this->writableId) {
+                unset($map[$this->idField]); // prevent modifying identity column
+            }
         } else {
             $idParts = explode('.', $propMap[$this->idField]->col);
             $this->idColumn = array_pop($idParts);
diff --git a/src/RouteHandler.php b/src/RouteHandler.php
index 0ea9583..66ef558 100644
--- a/src/RouteHandler.php
+++ b/src/RouteHandler.php
@@ -143,7 +143,9 @@ public function insert(string $class): callable
                 /** @var list<array> $data */
                 $body = ['ids' => $instance->addEntities($data)];
             } else {
-                $body = ['id' => $instance->addEntities([$data])[0]];
+                $ids = $instance->addEntities([$data]);
+                // array is empty when the ID column isn't auto-incremented
+                $body = ['id' => $ids[0] ?? $data[$instance->idField]];
             }
 
             $response->getBody()->write(json_encode($body));