diff --git a/HISTORY.rst b/HISTORY.rst
index 58b77160..e437f689 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -8,7 +8,7 @@ PlatformIO Core 5
 
 **A professional collaborative platform for embedded development**
 
-5.0.5 (2021-??-??)
+5.1.0 (2021-??-??)
 ~~~~~~~~~~~~~~~~~~
 
 * **Build System**
diff --git a/platformio/__init__.py b/platformio/__init__.py
index 7b9eaeb6..f049e6fd 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (5, 0, "5b5")
+VERSION = (5, 1, "0rc1")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"