diff --git a/focal_point.info.yml b/focal_point.info.yml
index f2d7bdf..49e4d4c 100644
--- a/focal_point.info.yml
+++ b/focal_point.info.yml
@@ -6,4 +6,4 @@ package: Images
 version: VERSION
 dependencies:
   - image
-  - crop
+  - crop (>=8.x-1.0-alpha2)
diff --git a/focal_point.install b/focal_point.install
index 6551772..9a78111 100644
--- a/focal_point.install
+++ b/focal_point.install
@@ -6,10 +6,27 @@
  */
 
 /**
+ * Checks if required version of Crop API is installed.
+ *
+ * @return bool
+ *   TRUE if dependency is met and FALSE if not.
+ */
+function _focal_point_check_crop_version() {
+  if (\Drupal::moduleHandler()->moduleExists('crop')) {
+    $info = system_get_info('module', 'crop');
+    if (version_compare($info['version'], '8.x-1.0-alpha2') >= 0) {
+      return TRUE;
+    }
+  }
+
+  return FALSE;
+}
+
+/**
  * Implements hook_requirements().
  */
 function focal_point_requirements($phase) {
-  if ($phase == 'update' && !\Drupal::moduleHandler()->moduleExists('crop')) {
+  if ($phase == 'update' && !_focal_point_check_crop_version()) {
     return [
       'crop' => [
         'title' => t('Focal point'),
@@ -28,7 +45,7 @@ function focal_point_requirements($phase) {
  * Install default config.
  */
 function focal_point_update_8001() {
-  if (!\Drupal::moduleHandler()->moduleExists('crop')) {
+  if (!_focal_point_check_crop_version()) {
     throw new \Drupal\Core\Utility\UpdateException('Crop API (drupal.org/project/crop) module is now a dependency and needs to be installed before running updates.');
   }
 
@@ -80,7 +97,7 @@ function focal_point_update_8002(&$sandbox) {
     $sandbox['last_fid'] = $file->id();
   }
 
-  $sandbox['#finished'] = $sandbox['num_processed'] / (float) $sandbox['total_items'];
+  $sandbox['#finished'] = $sandbox['total_items'] ? $sandbox['num_processed'] / $sandbox['total_items'] : 1;
 
   // Intentionally leaving legacy table. You never know...
 }
diff --git a/src/Plugin/Field/Validation/Constrant/FocalPointConstraint.php b/src/Plugin/Field/Validation/Constrant/FocalPointConstraint.php
new file mode 100644
index 0000000..e69de29