diff --git a/src/Symfony/Component/HttpKernel/Kernel.php b/src/Symfony/Component/HttpKernel/Kernel.php
index e8dd596cad1e2..172435207e37b 100644
--- a/src/Symfony/Component/HttpKernel/Kernel.php
+++ b/src/Symfony/Component/HttpKernel/Kernel.php
@@ -59,12 +59,12 @@ abstract class Kernel implements KernelInterface, TerminableInterface
     protected $startTime;
     protected $loadClassCache;
 
-    const VERSION = '2.8.9';
-    const VERSION_ID = 20809;
+    const VERSION = '2.8.10-DEV';
+    const VERSION_ID = 20810;
     const MAJOR_VERSION = 2;
     const MINOR_VERSION = 8;
-    const RELEASE_VERSION = 9;
-    const EXTRA_VERSION = '';
+    const RELEASE_VERSION = 10;
+    const EXTRA_VERSION = 'DEV';
 
     const END_OF_MAINTENANCE = '11/2018';
     const END_OF_LIFE = '11/2019';
diff --git a/src/Symfony/Component/VarDumper/Tests/Caster/SplCasterTest.php b/src/Symfony/Component/VarDumper/Tests/Caster/SplCasterTest.php
index c6d247e776777..7ed5339ca17d5 100644
--- a/src/Symfony/Component/VarDumper/Tests/Caster/SplCasterTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Caster/SplCasterTest.php
@@ -94,10 +94,10 @@ public function testCastFileObject()
   file: true
   dir: false
   link: false
-%AcsvControl: array:2 [
+%AcsvControl: array:%d [
     0 => ","
     1 => """
-  ]
+%A]
   flags: DROP_NEW_LINE|SKIP_EMPTY
   maxLineLen: 0
   fstat: array:26 [