diff --git a/CHANGELOG b/CHANGELOG
index 59fc48098..7798f3372 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+* 1.38.4 (2019-XX-XX)
+
+ * n/a
+
 * 1.38.3 (2019-03-21)
 
  * fixed the spaceless filter so that it behaves like the spaceless tag
diff --git a/ext/twig/php_twig.h b/ext/twig/php_twig.h
index 86394578c..419151858 100644
--- a/ext/twig/php_twig.h
+++ b/ext/twig/php_twig.h
@@ -15,7 +15,7 @@
 #ifndef PHP_TWIG_H
 #define PHP_TWIG_H
 
-#define PHP_TWIG_VERSION "1.38.3"
+#define PHP_TWIG_VERSION "1.38.4-DEV"
 
 #include "php.h"
 
diff --git a/src/Environment.php b/src/Environment.php
index 103cb74ed..b5de4a147 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -41,12 +41,12 @@ use Twig\TokenParser\TokenParserInterface;
  */
 class Environment
 {
-    const VERSION = '1.38.3';
-    const VERSION_ID = 13803;
+    const VERSION = '1.38.4-DEV';
+    const VERSION_ID = 13804;
     const MAJOR_VERSION = 2;
     const MINOR_VERSION = 38;
-    const RELEASE_VERSION = 3;
-    const EXTRA_VERSION = '';
+    const RELEASE_VERSION = 4;
+    const EXTRA_VERSION = 'DEV';
 
     protected $charset;
     protected $loader;