diff --git a/app/controllers/api/functions.php b/app/controllers/api/functions.php
index d2a1790d94..a810d7be5b 100644
--- a/app/controllers/api/functions.php
+++ b/app/controllers/api/functions.php
@@ -1621,6 +1621,13 @@ App::post('/v1/functions/:functionId/executions')
         $version = $function->getAttribute('version', 'v2');
         $runtimes = Config::getParam($version === 'v2' ? 'runtimes-v2' : 'runtimes', []);
 
+        /** Auto-update v3 runtimes into v4, remove me after we do migrations */
+        if ($version === 'v3') {
+            $function->setAttribute('version', 'v4');
+            $function = $dbForProject->updateDocument('functions', $function->getId(), $function);
+            $version = 'v4';
+        }
+
         $runtime = (isset($runtimes[$function->getAttribute('runtime', '')])) ? $runtimes[$function->getAttribute('runtime', '')] : null;
 
         if (\is_null($runtime)) {