diff --git a/src/php_spx.h b/src/php_spx.h
index 484ee7f..6e7b161 100644
--- a/src/php_spx.h
+++ b/src/php_spx.h
@@ -40,6 +40,6 @@
 #endif
 
 #define PHP_SPX_EXTNAME "SPX"
-#define PHP_SPX_VERSION "0.3.0"
+#define PHP_SPX_VERSION "0.4.0"
 
 extern zend_module_entry spx_module_entry;