diff --git a/CHANGELOG b/CHANGELOG
index e549c9307..3d6f0a6b0 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+* 1.42.6 (2020-XX-XX)
+
+ * n/a
+
 * 1.42.5 (2020-02-11)
 
  * Fix implementation of case-insensitivity for method names
diff --git a/src/Environment.php b/src/Environment.php
index 97fa4c4db..73518a484 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -41,12 +41,12 @@ use Twig\TokenParser\TokenParserInterface;
  */
 class Environment
 {
-    const VERSION = '1.42.5';
+    const VERSION = '1.42.6-DEV';
     const VERSION_ID = 14205;
     const MAJOR_VERSION = 1;
     const MINOR_VERSION = 42;
-    const RELEASE_VERSION = 5;
-    const EXTRA_VERSION = '';
+    const RELEASE_VERSION = 6;
+    const EXTRA_VERSION = 'DEV';
 
     protected $charset;
     protected $loader;