diff --git a/HISTORY.rst b/HISTORY.rst
index 2fa38d63a2..9606fdd925 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -6,7 +6,7 @@ Release Notes
 PlatformIO Core 4
 -----------------
 
-4.3.1 (2020-??-??)
+4.3.1 (2020-03-20)
 ~~~~~~~~~~~~~~~~~~
 
 * Fixed a SyntaxError "'return' with argument inside generator" for PIO Unified Debugger when Python 2.7 is used
diff --git a/docs b/docs
index 57d8b750ef..d97117eb2e 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 57d8b750efe08bd79adc2aa756feced3a1fba332
+Subproject commit d97117eb2e40380c309d1ef86ebf3501c673f270
diff --git a/platformio/__init__.py b/platformio/__init__.py
index 3d1f33edc2..afa9e24dee 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-VERSION = (4, 3, "1a1")
+VERSION = (4, 3, 1)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"