diff --git a/CHANGELOG b/CHANGELOG
index 5d7ea9527..37c45e7a4 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+# 3.20.1 (2025-XX-XX)
+
+ * n/a
+
 # 3.20.0 (2025-02-13)
 
  * Fix support for ignoring syntax errors in an undefined handler in guard
diff --git a/src/Environment.php b/src/Environment.php
index 17765cd2b..e1e88c656 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -44,12 +44,12 @@ use Twig\TokenParser\TokenParserInterface;
  */
 class Environment
 {
-    public const VERSION = '3.20.0';
-    public const VERSION_ID = 32000;
+    public const VERSION = '3.20.1-DEV';
+    public const VERSION_ID = 32001;
     public const MAJOR_VERSION = 3;
     public const MINOR_VERSION = 20;
-    public const RELEASE_VERSION = 0;
-    public const EXTRA_VERSION = '';
+    public const RELEASE_VERSION = 1;
+    public const EXTRA_VERSION = 'DEV';
 
     private $charset;
     private $loader;