diff --git a/HISTORY.rst b/HISTORY.rst
index 4771a3c088..9606fdd925 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -6,6 +6,13 @@ Release Notes
 PlatformIO Core 4
 -----------------
 
+4.3.1 (2020-03-20)
+~~~~~~~~~~~~~~~~~~
+
+* Fixed a SyntaxError "'return' with argument inside generator" for PIO Unified Debugger when Python 2.7 is used
+* Fixed an issue when ``lib_archive = no`` was not honored in `"platformio.ini" <https://docs.platformio.org/page/projectconf.html>`__
+* Fixed an TypeError "super(type, obj): obj must be an instance or subtype of type" when device monitor is used with a custom dev-platform filter (`issue #3431 <https://github.com/platformio/platformio-core/issues/3431>`_)
+
 4.3.0 (2020-03-19)
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/docs b/docs
index 51b7dd49b7..d97117eb2e 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 51b7dd49b703fd6156375a93d4bbb6e0890ecb09
+Subproject commit d97117eb2e40380c309d1ef86ebf3501c673f270
diff --git a/platformio/__init__.py b/platformio/__init__.py
index c5dd8dcce8..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, 0)
+VERSION = (4, 3, 1)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"
diff --git a/platformio/builder/tools/piolib.py b/platformio/builder/tools/piolib.py
index c9c97e2876..5e61abffaf 100644
--- a/platformio/builder/tools/piolib.py
+++ b/platformio/builder/tools/piolib.py
@@ -723,7 +723,9 @@ def lib_archive(self):
             "env:" + self.env["PIOENV"], "lib_archive", missing
         )
         if global_value != missing:
-            return global_value
+            return self.env.GetProjectConfig().get(
+                "env:" + self.env["PIOENV"], "lib_archive"
+            )
         return self._manifest.get("build", {}).get(
             "libArchive", LibBuilderBase.lib_archive.fget(self)
         )
diff --git a/platformio/commands/debug/server.py b/platformio/commands/debug/server.py
index 29a006780f..ef06b58c93 100644
--- a/platformio/commands/debug/server.py
+++ b/platformio/commands/debug/server.py
@@ -42,11 +42,11 @@ def spawn(self, patterns):  # pylint: disable=too-many-branches
         systype = util.get_systype()
         server = self.debug_options.get("server")
         if not server:
-            return None
+            defer.returnValue(None)
         server = self.apply_patterns(server, patterns)
         server_executable = server["executable"]
         if not server_executable:
-            return None
+            defer.returnValue(None)
         if server["cwd"]:
             server_executable = join(server["cwd"], server_executable)
         if (
@@ -83,7 +83,7 @@ def spawn(self, patterns):  # pylint: disable=too-many-branches
             )
             self._debug_port = '| "%s" %s' % (server_executable, str_args)
             self._debug_port = fs.to_unix_path(self._debug_port)
-            return self._debug_port
+            defer.returnValue(self._debug_port)
 
         env = os.environ.copy()
         # prepend server "lib" folder to LD path
@@ -120,7 +120,7 @@ def spawn(self, patterns):  # pylint: disable=too-many-branches
 
         yield self._wait_until_ready()
 
-        return self._debug_port
+        defer.returnValue(self._debug_port)
 
     @defer.inlineCallbacks
     def _wait_until_ready(self):
diff --git a/platformio/commands/device/filters/base.py b/platformio/commands/device/filters/base.py
index bc0880b35b..5c6d0400f1 100644
--- a/platformio/commands/device/filters/base.py
+++ b/platformio/commands/device/filters/base.py
@@ -20,7 +20,7 @@
 class DeviceMonitorFilter(miniterm.Transform):
     def __init__(self, project_dir=None, environment=None):
         """ Called by PlatformIO to pass context """
-        super(DeviceMonitorFilter, self).__init__()
+        miniterm.Transform.__init__(self)
 
         self.project_dir = project_dir
         self.environment = environment
diff --git a/setup.py b/setup.py
index 2d3cd72f4e..512d2757ab 100644
--- a/setup.py
+++ b/setup.py
@@ -23,12 +23,12 @@
     __url__,
     __version__,
 )
-from platformio.compat import PY2
+from platformio.compat import PY2, WINDOWS
 
 
 install_requires = [
     "bottle<0.13",
-    "click>=5,<8,!=7.1,!=7.1.1",
+    "click>=5,<8%s" % (",!=7.1,!=7.1.1" if WINDOWS else ""),
     "colorama",
     "pyserial>=3,<4,!=3.3",
     "requests>=2.4.0,<3",