diff --git a/CHANGELOG b/CHANGELOG
index 44c79b133..d76769421 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+# 3.15.0 (2024-XX-XX)
+
+ * n/a
+
 # 3.14.0 (2024-09-09)
 
  * Fix a security issue when an included sandboxed template has been loaded before without the sandbox context
diff --git a/src/Environment.php b/src/Environment.php
index 24e55e979..06a306b89 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -43,12 +43,12 @@ use Twig\TokenParser\TokenParserInterface;
  */
 class Environment
 {
-    public const VERSION = '3.14.0';
-    public const VERSION_ID = 31400;
+    public const VERSION = '3.15.0-DEV';
+    public const VERSION_ID = 31500;
     public const MAJOR_VERSION = 3;
-    public const MINOR_VERSION = 14;
+    public const MINOR_VERSION = 15;
     public const RELEASE_VERSION = 0;
-    public const EXTRA_VERSION = '';
+    public const EXTRA_VERSION = 'DEV';
 
     private $charset;
     private $loader;