diff --git a/NEWS b/NEWS
index efa26ba5e2b..692a2ae52b2 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,9 @@
 PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-?? ??? ????, PHP 8.5.4
+?? ??? ????, PHP 8.5.5
+
+
+12 Mar 2026, PHP 8.5.4
 
 - Core:
   . Fixed bug GH-21029 (zend_mm_heap corrupted on Aarch64, LTO builds). (Arnaud)
diff --git a/Zend/zend.h b/Zend/zend.h
index 49684e113d6..2d214bab196 100644
--- a/Zend/zend.h
+++ b/Zend/zend.h
@@ -20,7 +20,7 @@
 #ifndef ZEND_H
 #define ZEND_H
 
-#define ZEND_VERSION "4.5.4-dev"
+#define ZEND_VERSION "4.5.5-dev"
 
 #define ZEND_ENGINE_3
 
diff --git a/configure.ac b/configure.ac
index c4ce3ee2248..e4a477dae30 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ dnl Basic autoconf initialization, generation of config.nice.
 dnl ----------------------------------------------------------------------------
 
 AC_PREREQ([2.68])
-AC_INIT([PHP],[8.5.4-dev],[https://github.com/php/php-src/issues],[php],[https://www.php.net])
+AC_INIT([PHP],[8.5.5-dev],[https://github.com/php/php-src/issues],[php],[https://www.php.net])
 AC_CONFIG_SRCDIR([main/php_version.h])
 AC_CONFIG_AUX_DIR([build])
 AC_PRESERVE_HELP_ORDER
diff --git a/main/php_version.h b/main/php_version.h
index 1c1613d6d3d..859fde69b42 100644
--- a/main/php_version.h
+++ b/main/php_version.h
@@ -4,5 +4,5 @@
 #define PHP_MINOR_VERSION 5
 #define PHP_RELEASE_VERSION 4
 #define PHP_EXTRA_VERSION "-dev"
-#define PHP_VERSION "8.5.4-dev"
+#define PHP_VERSION "8.5.5-dev"
 #define PHP_VERSION_ID 80504