diff --git a/composer.json b/composer.json
index 0d0597f15..1dac84d00 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
     },
     "require-dev": {
         "cakephp/bake": "^3.3",
-        "cakephp/cakephp": "^5.3.0",
+        "cakephp/cakephp": "^5.3.2",
         "cakephp/cakephp-codesniffer": "^5.0",
         "phpunit/phpunit": "^11.5.3 || ^12.1.3"
     },
diff --git a/src/Db/Table.php b/src/Db/Table.php
index aeeb09066..711efff0d 100644
--- a/src/Db/Table.php
+++ b/src/Db/Table.php
@@ -729,8 +729,8 @@ public function addTimestamps(string|false|null $createdAt = 'created', string|f
         }
         if ($updatedAt) {
             $this->addColumn($updatedAt, $timestampType, [
-                'null' => true,
-                'default' => null,
+                'null' => false,
+                'default' => 'CURRENT_TIMESTAMP',
                 'update' => 'CURRENT_TIMESTAMP',
                 'timezone' => $withTimezone,
             ]);
diff --git a/tests/TestCase/Db/Adapter/MysqlAdapterTest.php b/tests/TestCase/Db/Adapter/MysqlAdapterTest.php
index 85aded715..91cf6833f 100644
--- a/tests/TestCase/Db/Adapter/MysqlAdapterTest.php
+++ b/tests/TestCase/Db/Adapter/MysqlAdapterTest.php
@@ -576,8 +576,8 @@ public function testAddTimestampsFeatureFlag()
         $this->assertEquals('updated', $columns[2]->getName());
         $this->assertEquals('datetime', $columns[2]->getType());
         $this->assertContains($columns[2]->getUpdate(), ['CURRENT_TIMESTAMP', 'current_timestamp()']);
-        $this->assertTrue($columns[2]->isNull());
-        $this->assertNull($columns[2]->getDefault());
+        $this->assertFalse($columns[2]->isNull());
+        $this->assertContains($columns[2]->getDefault(), ['CURRENT_TIMESTAMP', 'current_timestamp()']);
     }
 
     public function testCreateTableWithSchema()
diff --git a/tests/TestCase/Db/Adapter/SqliteAdapterTest.php b/tests/TestCase/Db/Adapter/SqliteAdapterTest.php
index 2fd54a9bd..5b3c80fae 100644
--- a/tests/TestCase/Db/Adapter/SqliteAdapterTest.php
+++ b/tests/TestCase/Db/Adapter/SqliteAdapterTest.php
@@ -2092,7 +2092,7 @@ public function testAlterTableColumnAdd()
             ['name' => 'string_col_2', 'type' => 'string', 'default' => null, 'null' => true],
             ['name' => 'string_col_3', 'type' => 'string', 'default' => null, 'null' => false],
             ['name' => 'created', 'type' => 'timestamp', 'default' => 'CURRENT_TIMESTAMP', 'null' => false],
-            ['name' => 'updated', 'type' => 'timestamp', 'default' => null, 'null' => true],
+            ['name' => 'updated', 'type' => 'timestamp', 'default' => 'CURRENT_TIMESTAMP', 'null' => false],
         ];
 
         $this->assertEquals(count($expected), count($columns));
diff --git a/tests/TestCase/Db/Table/TableTest.php b/tests/TestCase/Db/Table/TableTest.php
index 21912fd58..7e400bea1 100644
--- a/tests/TestCase/Db/Table/TableTest.php
+++ b/tests/TestCase/Db/Table/TableTest.php
@@ -195,8 +195,8 @@ public function testAddTimestamps(
         $this->assertEquals('timestamp', $columns[1]->getType());
         $this->assertEquals($withTimezone, $columns[1]->getTimezone());
         $this->assertEquals('CURRENT_TIMESTAMP', $columns[1]->getUpdate());
-        $this->assertTrue($columns[1]->isNull());
-        $this->assertNull($columns[1]->getDefault());
+        $this->assertFalse($columns[1]->isNull());
+        $this->assertEquals('CURRENT_TIMESTAMP', $columns[1]->getDefault());
     }
 
     /**
@@ -246,8 +246,8 @@ public function testAddTimestampsNoCreated(AdapterInterface $adapter)
         $this->assertSame('timestamp', $columns[0]->getType());
         $this->assertFalse($columns[0]->getTimezone());
         $this->assertSame('CURRENT_TIMESTAMP', $columns[0]->getUpdate());
-        $this->assertTrue($columns[0]->isNull());
-        $this->assertNull($columns[0]->getDefault());
+        $this->assertFalse($columns[0]->isNull());
+        $this->assertSame('CURRENT_TIMESTAMP', $columns[0]->getDefault());
     }
 
     /**
@@ -299,8 +299,8 @@ public function testAddTimestampsWithTimezone(
         $this->assertEquals('timestamp', $columns[1]->getType());
         $this->assertTrue($columns[1]->getTimezone());
         $this->assertEquals('CURRENT_TIMESTAMP', $columns[1]->getUpdate());
-        $this->assertTrue($columns[1]->isNull());
-        $this->assertNull($columns[1]->getDefault());
+        $this->assertFalse($columns[1]->isNull());
+        $this->assertEquals('CURRENT_TIMESTAMP', $columns[1]->getDefault());
     }
 
     public function testInsert()
diff --git a/tests/comparisons/Diff/addRemove/schema-dump-test_comparisons_mysql.lock b/tests/comparisons/Diff/addRemove/schema-dump-test_comparisons_mysql.lock
index bd5dcdabf..567467f79 100644
Binary files a/tests/comparisons/Diff/addRemove/schema-dump-test_comparisons_mysql.lock and b/tests/comparisons/Diff/addRemove/schema-dump-test_comparisons_mysql.lock differ
diff --git a/tests/comparisons/Diff/addRemove/schema-dump-test_comparisons_pgsql.lock b/tests/comparisons/Diff/addRemove/schema-dump-test_comparisons_pgsql.lock
index c9926532b..0fda7cc04 100644
Binary files a/tests/comparisons/Diff/addRemove/schema-dump-test_comparisons_pgsql.lock and b/tests/comparisons/Diff/addRemove/schema-dump-test_comparisons_pgsql.lock differ
diff --git a/tests/comparisons/Diff/decimalChange/schema-dump-test_comparisons_mysql.lock b/tests/comparisons/Diff/decimalChange/schema-dump-test_comparisons_mysql.lock
index 9c497e7b2..499dc7d32 100644
Binary files a/tests/comparisons/Diff/decimalChange/schema-dump-test_comparisons_mysql.lock and b/tests/comparisons/Diff/decimalChange/schema-dump-test_comparisons_mysql.lock differ
diff --git a/tests/comparisons/Diff/default/schema-dump-test_comparisons_mysql.lock b/tests/comparisons/Diff/default/schema-dump-test_comparisons_mysql.lock
index 10092ee02..58fa3362e 100644
Binary files a/tests/comparisons/Diff/default/schema-dump-test_comparisons_mysql.lock and b/tests/comparisons/Diff/default/schema-dump-test_comparisons_mysql.lock differ
diff --git a/tests/comparisons/Diff/default/schema-dump-test_comparisons_pgsql.lock b/tests/comparisons/Diff/default/schema-dump-test_comparisons_pgsql.lock
index 91799f2fb..399d95af1 100644
Binary files a/tests/comparisons/Diff/default/schema-dump-test_comparisons_pgsql.lock and b/tests/comparisons/Diff/default/schema-dump-test_comparisons_pgsql.lock differ
diff --git a/tests/comparisons/Diff/refresh_schema_dumps.php b/tests/comparisons/Diff/refresh_schema_dumps.php
new file mode 100644
index 000000000..075f709af
--- /dev/null
+++ b/tests/comparisons/Diff/refresh_schema_dumps.php
@@ -0,0 +1,235 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * # Check which Diff lock fixtures need refresh
+ * php tests/comparisons/Diff/refresh_schema_dumps.php
+ *
+ * # Regenerate all Diff lock fixtures in place
+ * php tests/comparisons/Diff/refresh_schema_dumps.php --write
+ *
+ * # Regenerate only one fixture
+ * php tests/comparisons/Diff/refresh_schema_dumps.php --write --file tests/comparisons/Diff/decimalChange/schema-dump-test_comparisons_mysql.lock
+ */
+
+require dirname(__DIR__, 3) . '/vendor/autoload.php';
+
+const EXIT_OK = 0;
+const EXIT_UPDATES_AVAILABLE = 1;
+const EXIT_ERROR = 2;
+
+/**
+ * Defaults for known typed properties that can be introduced between CakePHP releases.
+ *
+ * @var array<string, array<string, mixed>>
+ */
+$knownDefaults = [
+    Cake\Database\Schema\Column::class => [
+        'fixed' => false,
+    ],
+];
+
+$options = getopt('', ['write', 'file:']);
+$write = isset($options['write']);
+$filesOption = $options['file'] ?? [];
+$selectedFiles = is_array($filesOption) ? $filesOption : [$filesOption];
+
+$files = getFixtureFiles(__DIR__, $selectedFiles);
+if ($files === []) {
+    fwrite(STDERR, "No schema dump fixtures found.\n");
+    exit(EXIT_ERROR);
+}
+
+$updatedFiles = [];
+$hasPendingUpdates = false;
+
+foreach ($files as $file) {
+    $serialized = file_get_contents($file);
+    if ($serialized === false) {
+        fwrite(STDERR, "Failed to read: {$file}\n");
+        exit(EXIT_ERROR);
+    }
+
+    $data = @unserialize($serialized);
+    if ($data === false && $serialized !== serialize(false)) {
+        fwrite(STDERR, "Failed to unserialize: {$file}\n");
+        exit(EXIT_ERROR);
+    }
+
+    $visited = new SplObjectStorage();
+    fixUninitializedTypedProperties($data, $knownDefaults, $visited, $file);
+
+    $normalized = serialize($data);
+    if ($normalized === $serialized) {
+        continue;
+    }
+
+    $hasPendingUpdates = true;
+    if ($write) {
+        if (file_put_contents($file, $normalized) === false) {
+            fwrite(STDERR, "Failed to write: {$file}\n");
+            exit(EXIT_ERROR);
+        }
+        $updatedFiles[] = $file;
+        echo "Updated {$file}\n";
+    } else {
+        echo "Needs update {$file}\n";
+    }
+}
+
+if (!$hasPendingUpdates) {
+    echo "All schema dump fixtures are up to date.\n";
+    exit(EXIT_OK);
+}
+
+if (!$write) {
+    echo "Run with --write to regenerate fixtures.\n";
+    exit(EXIT_UPDATES_AVAILABLE);
+}
+
+echo sprintf("Updated %d fixture(s).\n", count($updatedFiles));
+exit(EXIT_OK);
+
+/**
+ * @param array<int, string> $selectedFiles
+ * @return array<int, string>
+ */
+function getFixtureFiles(string $baseDir, array $selectedFiles): array
+{
+    if ($selectedFiles !== []) {
+        $files = [];
+        foreach ($selectedFiles as $file) {
+            if ($file === '') {
+                continue;
+            }
+            $resolved = str_starts_with($file, '/')
+                ? $file
+                : realpath(getcwd() . DIRECTORY_SEPARATOR . $file);
+            if ($resolved === false || !is_file($resolved)) {
+                fwrite(STDERR, "Invalid --file path: {$file}\n");
+                exit(EXIT_ERROR);
+            }
+            $files[] = $resolved;
+        }
+
+        return $files;
+    }
+
+    $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($baseDir));
+    $files = [];
+    foreach ($iterator as $item) {
+        if (!$item->isFile()) {
+            continue;
+        }
+        $path = $item->getPathname();
+        if (preg_match('/schema-dump-.*\.lock$/', $path) === 1) {
+            $files[] = $path;
+        }
+    }
+    sort($files);
+
+    return $files;
+}
+
+/**
+ * @param array<string, array<string, mixed>> $knownDefaults
+ */
+function fixUninitializedTypedProperties(
+    mixed &$value,
+    array $knownDefaults,
+    SplObjectStorage $visited,
+    string $file
+): void {
+    if (is_array($value)) {
+        foreach ($value as &$nested) {
+            fixUninitializedTypedProperties($nested, $knownDefaults, $visited, $file);
+        }
+        unset($nested);
+
+        return;
+    }
+
+    if (!is_object($value) || $visited->offsetExists($value)) {
+        return;
+    }
+
+    $visited[$value] = true;
+    $class = new ReflectionClass($value);
+    $defaultsByClass = $knownDefaults[$class->getName()] ?? [];
+
+    foreach (getAllProperties($class) as $property) {
+        if ($property->isStatic()) {
+            continue;
+        }
+
+        if (!$property->isInitialized($value)) {
+            if (array_key_exists($property->getName(), $defaultsByClass)) {
+                $property->setValue($value, $defaultsByClass[$property->getName()]);
+                continue;
+            }
+            $inferred = inferDefaultValue($property);
+            if ($inferred['ok'] === false) {
+                $className = $class->getName();
+                $propertyName = $property->getName();
+                fwrite(
+                    STDERR,
+                    "Cannot infer default for uninitialized typed property " .
+                    "{$className}::\${$propertyName} in {$file}\n"
+                );
+                exit(EXIT_ERROR);
+            }
+            $property->setValue($value, $inferred['value']);
+        }
+
+        $nested = $property->getValue($value);
+        fixUninitializedTypedProperties($nested, $knownDefaults, $visited, $file);
+        $property->setValue($value, $nested);
+    }
+}
+
+/**
+ * @return array<int, ReflectionProperty>
+ */
+function getAllProperties(ReflectionClass $class): array
+{
+    $properties = [];
+    do {
+        foreach ($class->getProperties() as $property) {
+            $declaringClass = $property->getDeclaringClass()->getName();
+            $name = $declaringClass . '::' . $property->getName();
+            $properties[$name] = $property;
+        }
+        $class = $class->getParentClass();
+    } while ($class !== false);
+
+    return array_values($properties);
+}
+
+/**
+ * @return array{ok: bool, value?: mixed}
+ */
+function inferDefaultValue(ReflectionProperty $property): array
+{
+    $type = $property->getType();
+    if ($type === null) {
+        return ['ok' => true, 'value' => null];
+    }
+
+    if ($type->allowsNull()) {
+        return ['ok' => true, 'value' => null];
+    }
+
+    if ($type instanceof ReflectionNamedType) {
+        return match ($type->getName()) {
+            'bool', 'false' => ['ok' => true, 'value' => false],
+            'true' => ['ok' => true, 'value' => true],
+            'int' => ['ok' => true, 'value' => 0],
+            'float' => ['ok' => true, 'value' => 0.0],
+            'string' => ['ok' => true, 'value' => ''],
+            'array' => ['ok' => true, 'value' => []],
+            default => ['ok' => false],
+        };
+    }
+
+    return ['ok' => false];
+}
diff --git a/tests/comparisons/Diff/simple/schema-dump-test_comparisons_mysql.lock b/tests/comparisons/Diff/simple/schema-dump-test_comparisons_mysql.lock
index 7aef17bcc..88789db9a 100644
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diff --git a/tests/comparisons/Diff/simple/schema-dump-test_comparisons_pgsql.lock b/tests/comparisons/Diff/simple/schema-dump-test_comparisons_pgsql.lock
index 435ce5852..29007cb78 100644
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diff --git a/tests/comparisons/Diff/withAutoIdCompatibleSignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock b/tests/comparisons/Diff/withAutoIdCompatibleSignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock
index 4744181c9..67884e41e 100644
Binary files a/tests/comparisons/Diff/withAutoIdCompatibleSignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock and b/tests/comparisons/Diff/withAutoIdCompatibleSignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock differ
diff --git a/tests/comparisons/Diff/withAutoIdIncompatibleSignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock b/tests/comparisons/Diff/withAutoIdIncompatibleSignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock
index 4744181c9..67884e41e 100644
Binary files a/tests/comparisons/Diff/withAutoIdIncompatibleSignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock and b/tests/comparisons/Diff/withAutoIdIncompatibleSignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock differ
diff --git a/tests/comparisons/Diff/withAutoIdIncompatibleUnsignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock b/tests/comparisons/Diff/withAutoIdIncompatibleUnsignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock
index 522a9be3d..9e291c670 100644
Binary files a/tests/comparisons/Diff/withAutoIdIncompatibleUnsignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock and b/tests/comparisons/Diff/withAutoIdIncompatibleUnsignedPrimaryKeys/schema-dump-test_comparisons_mysql.lock differ