diff --git a/library.json b/library.json
index c98a9d8e45..5e120f5420 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
 	"name": "lvgl",
-	"version": "8.3.0",
+	"version": "9.0.0-dev",
 	"keywords": "graphics, gui, embedded, tft, lvgl",
 	"description": "Graphics library to create embedded GUI with easy-to-use graphical elements, beautiful visual effects and low memory footprint. It offers anti-aliasing, opacity, and animations using only one frame buffer.",
 	"repository": {
diff --git a/library.properties b/library.properties
index 4b27e7d96a..eb9ef721ae 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=lvgl
-version=8.3.0
+version=9.0.0-dev
 author=kisvegabor
 maintainer=kisvegabor,embeddedt,pete-pjb
 sentence=Full-featured Graphics Library for Embedded Systems
diff --git a/lv_conf_template.h b/lv_conf_template.h
index 03a4ec3532..3bb8800709 100644
--- a/lv_conf_template.h
+++ b/lv_conf_template.h
@@ -1,6 +1,6 @@
 /**
  * @file lv_conf.h
- * Configuration file for v8.3.0
+ * Configuration file for v9.0.0-dev
  */
 
 /*
diff --git a/lvgl.h b/lvgl.h
index 3157644168..657499e9ac 100644
--- a/lvgl.h
+++ b/lvgl.h
@@ -13,10 +13,10 @@ extern "C" {
 /***************************
  * CURRENT VERSION OF LVGL
  ***************************/
-#define LVGL_VERSION_MAJOR 8
-#define LVGL_VERSION_MINOR 3
+#define LVGL_VERSION_MAJOR 9
+#define LVGL_VERSION_MINOR 0
 #define LVGL_VERSION_PATCH 0
-#define LVGL_VERSION_INFO ""
+#define LVGL_VERSION_INFO "dev"
 
 /*********************
  *      INCLUDES