diff --git a/HISTORY.rst b/HISTORY.rst
index c5bfb57b..d84c84da 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -8,7 +8,7 @@ PlatformIO Core 5
 
 **A professional collaborative platform for embedded development**
 
-5.2.1 (2021-??-??)
+5.2.1 (2021-10-11)
 ~~~~~~~~~~~~~~~~~~
 
 - Clean a build environment and installed library dependencies using a new ``cleanall`` target (`issue #4062 <https://github.com/platformio/platformio-core/issues/4062>`_)
@@ -20,7 +20,6 @@ PlatformIO Core 5
 - Fixed a "FileExist" error when the `platformio ci <https://docs.platformio.org/en/latest/userguide/cmd_ci.html>`__ command is used in pair with the ``--keep-build-dir`` option (`issue #4011 <https://github.com/platformio/platformio-core/issues/4011>`_)
 - Fixed an issue with draft values of C++ language standards that broke static analysis via Cppcheck (`issue #3944 <https://github.com/platformio/platformio-core/issues/3944>`_)
 
-
 5.2.0 (2021-09-13)
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/docs b/docs
index c9c5b9cd..8a613430 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit c9c5b9cd5f18b17be71225df1bf5b487660e58e1
+Subproject commit 8a613430957704dfc2e4fc30337020a0a80cfba8
diff --git a/platformio/__init__.py b/platformio/__init__.py
index b5972fe8..31da28ca 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (5, 2, "1rc2")
+VERSION = (5, 2, 1)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"