diff --git a/CHANGELOG b/CHANGELOG
index 7aafb508c..c17d640ea 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+# 3.1.1 (2020-XX-XX)
+
+ * n/a
+
 # 3.1.0 (2020-10-21)
 
  * Fix sandbox support when using "include(template_from_string())"
diff --git a/src/Environment.php b/src/Environment.php
index 586286cf5..4c2fe86b0 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -38,12 +38,12 @@ use Twig\TokenParser\TokenParserInterface;
  */
 class Environment
 {
-    const VERSION = '3.1.0';
-    const VERSION_ID = 30100;
+    const VERSION = '3.1.1-DEV';
+    const VERSION_ID = 30101;
     const MAJOR_VERSION = 3;
     const MINOR_VERSION = 1;
-    const RELEASE_VERSION = 0;
-    const EXTRA_VERSION = '';
+    const RELEASE_VERSION = 1;
+    const EXTRA_VERSION = 'DEV';
 
     private $charset;
     private $loader;