diff --git a/HISTORY.rst b/HISTORY.rst
index 7401f2d6..d6803d0b 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -18,8 +18,10 @@ PlatformIO Core 5
     * `pio pkg outdated <https://docs.platformio.org/en/latest/core/userguide/pkg/cmd_pack.html>`__ - check for project outdated packages
     * `pio pkg exec <https://docs.platformio.org/en/latest/core/userguide/pkg/cmd_exec.html>`_ - run command from package tool (`issue #4163 <https://github.com/platformio/platformio-core/issues/4163>`_)
 
+  - Dropped automatic updates of global libraries and development platforms (`issue #4179 <https://github.com/platformio/platformio-core/issues/4179>`_)
+  - Dropped support for "pythonPackages" field in "platform.json" manifest in favor of `Extra Python Dependencies <https://docs.platformio.org/en/latest/scripting/examples/extra_python_packages.html>`__
+
 * Improved PIO Remote setup on credit-card sized computers (Raspberry Pi, BeagleBon, etc) (`issue #3865 <https://github.com/platformio/platformio-core/issues/3865>`_)
-* Dropped automatic updates of global libraries and development platforms (`issue #4179 <https://github.com/platformio/platformio-core/issues/4179>`_)
 
 5.2.5 (2022-02-10)
 ~~~~~~~~~~~~~~~~~~
diff --git a/docs b/docs
index 5a4ab6ac..87396f76 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 5a4ab6acb49ee3b118e1d3aa25fb540ba0b1defb
+Subproject commit 87396f762b6aa8cb0079fcf9b4d147e52d26cc3f
diff --git a/platformio/package/manager/platform.py b/platformio/package/manager/platform.py
index 0b438018..6251f9aa 100644
--- a/platformio/package/manager/platform.py
+++ b/platformio/package/manager/platform.py
@@ -47,7 +47,9 @@ class PlatformPackageManager(BasePackageManager):  # pylint: disable=too-many-an
         with_all_packages=False,
         silent=False,
         force=False,
+        project_env=None,
     ):
+        already_installed = self.get_package(spec)
         pkg = super(PlatformPackageManager, self).install(
             spec, silent=silent, force=force, skip_dependencies=True
         )
@@ -60,6 +62,9 @@ class PlatformPackageManager(BasePackageManager):  # pylint: disable=too-many-an
             )
             raise e
 
+        if project_env:
+            p.configure_project_packages(project_env)
+
         if with_all_packages:
             with_packages = list(p.packages)
 
@@ -70,8 +75,8 @@ class PlatformPackageManager(BasePackageManager):  # pylint: disable=too-many-an
             silent=silent,
             force=force,
         )
-        p.install_python_packages()
-        p.on_installed()
+        if not already_installed:
+            p.on_installed()
         return pkg
 
     def uninstall(self, spec, silent=False, skip_dependencies=False):
@@ -83,7 +88,6 @@ class PlatformPackageManager(BasePackageManager):  # pylint: disable=too-many-an
             pkg, silent=silent, skip_dependencies=True
         )
         if not skip_dependencies:
-            p.uninstall_python_packages()
             p.on_uninstalled()
         return pkg
 
diff --git a/platformio/platform/base.py b/platformio/platform/base.py
index c5d9d636..75cf6f24 100644
--- a/platformio/platform/base.py
+++ b/platformio/platform/base.py
@@ -13,12 +13,10 @@
 # limitations under the License.
 
 import os
-import subprocess
 
-import click
 import semantic_version
 
-from platformio import __version__, fs, proc
+from platformio import __version__, fs
 from platformio.package.manager.tool import ToolPackageManager
 from platformio.package.version import pepver_to_semver
 from platformio.platform._packages import PlatformPackagesMixin
@@ -104,10 +102,6 @@ class PlatformBase(  # pylint: disable=too-many-instance-attributes,too-many-pub
             packages[spec.name].update(**options)
         return packages
 
-    @property
-    def python_packages(self):
-        return self._manifest.get("pythonPackages")
-
     def ensure_engine_compatible(self):
         if not self.engines or "platformio" not in self.engines:
             return True
@@ -238,37 +232,3 @@ class PlatformBase(  # pylint: disable=too-many-instance-attributes,too-many-pub
 
     def on_uninstalled(self):
         pass
-
-    def install_python_packages(self):
-        if not self.python_packages:
-            return None
-        click.echo(
-            "Installing Python packages: %s"
-            % ", ".join(list(self.python_packages.keys())),
-        )
-        args = [proc.get_pythonexe_path(), "-m", "pip", "install", "--upgrade"]
-        for name, requirements in self.python_packages.items():
-            if any(c in requirements for c in ("<", ">", "=")):
-                args.append("%s%s" % (name, requirements))
-            else:
-                args.append("%s==%s" % (name, requirements))
-        try:
-            return subprocess.call(args) == 0
-        except Exception as e:  # pylint: disable=broad-except
-            click.secho(
-                "Could not install Python packages -> %s" % e, fg="red", err=True
-            )
-        return None
-
-    def uninstall_python_packages(self):
-        if not self.python_packages:
-            return
-        click.echo("Uninstalling Python packages")
-        args = [proc.get_pythonexe_path(), "-m", "pip", "uninstall", "--yes"]
-        args.extend(list(self.python_packages.keys()))
-        try:
-            subprocess.call(args) == 0
-        except Exception as e:  # pylint: disable=broad-except
-            click.secho(
-                "Could not install Python packages -> %s" % e, fg="red", err=True
-            )