diff --git a/CHANGELOG b/CHANGELOG
index cbc4a6339..12ce1ecc6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,4 @@
-* 2.12.1 (2019-XX-XX)
+* 2.12.1 (2019-10-17)
 
  * added the String extension in the "extra" repositories: "u" filter
 
diff --git a/src/Environment.php b/src/Environment.php
index 456413d26..ca5752e24 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -38,12 +38,12 @@ use Twig\TokenParser\TokenParserInterface;
  */
 class Environment
 {
-    const VERSION = '2.12.1-DEV';
+    const VERSION = '2.12.1';
     const VERSION_ID = 21201;
     const MAJOR_VERSION = 2;
     const MINOR_VERSION = 12;
     const RELEASE_VERSION = 1;
-    const EXTRA_VERSION = 'DEV';
+    const EXTRA_VERSION = '';
 
     private $charset;
     private $loader;