diff --git a/.github/workflows/examples.yml b/.github/workflows/examples.yml
index 9d03bd2..b24ad69 100644
--- a/.github/workflows/examples.yml
+++ b/.github/workflows/examples.yml
@@ -7,25 +7,23 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-18.04, windows-latest, macos-latest]
-        python-version: [3.7]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         example:
           - "examples/arduino-blink"
           - "examples/arduino-external-libs"
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           submodules: "recursive"
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v1
+      - name: Set up Python
+        uses: actions/setup-python@v3
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: "3.9"
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
           pip install -U https://github.com/platformio/platformio/archive/develop.zip
-          platformio platform install file://.
+          pio pkg install --global --platform symlink://.
       - name: Build examples
         run: |
-          platformio run -d ${{ matrix.example }}
+          pio run -d ${{ matrix.example }}
diff --git a/README.md b/README.md
index 47b4217..2f2ee78 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ RP2040 is a low-cost, high-performance microcontroller device with a large on-ch
 
 # Usage
 
-1. [Install PlatformIO](http://platformio.org)
+1. [Install PlatformIO](https://platformio.org)
 2. Create PlatformIO project and configure a platform option in [platformio.ini](https://docs.platformio.org/page/projectconf.html) file:
 
 ## Stable version
diff --git a/builder/frameworks/_bare.py b/builder/frameworks/_bare.py
index 4fd489e..a083fa9 100644
--- a/builder/frameworks/_bare.py
+++ b/builder/frameworks/_bare.py
@@ -21,7 +21,12 @@ from SCons.Script import DefaultEnvironment
 env = DefaultEnvironment()
 
 env.Append(
-    ASFLAGS=["-x", "assembler-with-cpp"],
+    ASFLAGS=[
+        "-mthumb",
+    ],
+    ASPPFLAGS=[
+        "-x", "assembler-with-cpp",
+    ],
 
     CCFLAGS=[
         "-Os",  # optimize for size
@@ -54,6 +59,9 @@ env.Append(
 
 if "BOARD" in env:
     env.Append(
+        ASFLAGS=[
+            "-mcpu=%s" % env.BoardConfig().get("build.cpu")
+        ],
         CCFLAGS=[
             "-mcpu=%s" % env.BoardConfig().get("build.cpu")
         ],
@@ -61,6 +69,3 @@ if "BOARD" in env:
             "-mcpu=%s" % env.BoardConfig().get("build.cpu")
         ]
     )
-
-# copy CCFLAGS to ASFLAGS (-x assembler-with-cpp mode)
-env.Append(ASFLAGS=env.get("CCFLAGS", [])[:])
diff --git a/builder/frameworks/arduino/mbed-core b/builder/frameworks/arduino/mbed-core
index 36ee4ff..ed9a345 160000
--- a/builder/frameworks/arduino/mbed-core
+++ b/builder/frameworks/arduino/mbed-core
@@ -1 +1 @@
-Subproject commit 36ee4ff8adb0d80d6ff15e03b34e7b10a147b4d0
+Subproject commit ed9a3458e336660fdf2b1d4a4c828a2ddfd214ad
diff --git a/builder/main.py b/builder/main.py
index 0854f09..e59f3f5 100644
--- a/builder/main.py
+++ b/builder/main.py
@@ -17,7 +17,7 @@ from platform import system
 from os import makedirs
 from os.path import isdir, join
 
-from platformio.util import get_serial_ports
+from platformio.public import list_serial_ports
 
 from SCons.Script import (ARGUMENTS, COMMAND_LINE_TARGETS, AlwaysBuild,
                           Builder, Default, DefaultEnvironment)
@@ -29,7 +29,7 @@ def BeforeUpload(target, source, env):  # pylint: disable=W0613,W0621
         upload_options = env.BoardConfig().get("upload", {})
 
     env.AutodetectUploadPort()
-    before_ports = get_serial_ports()
+    before_ports = list_serial_ports()
 
     if upload_options.get("use_1200bps_touch", False):
         env.TouchSerialPort("$UPLOAD_PORT", 1200)
diff --git a/platform.json b/platform.json
index 4ab2f54..08e0339 100644
--- a/platform.json
+++ b/platform.json
@@ -12,13 +12,13 @@
     "RP2040"
   ],
   "engines": {
-    "platformio": "^5"
+    "platformio": "^6"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/platformio/platform-raspberrypi.git"
   },
-  "version": "1.6.0",
+  "version": "1.7.0",
   "frameworks": {
     "arduino": {
       "package": "framework-arduino-mbed",
@@ -35,7 +35,7 @@
       "type": "framework",
       "optional": true,
       "owner": "platformio",
-      "version": "~3.0.1"
+      "version": "~3.1.1"
     },
     "tool-rp2040tools": {
       "type": "uploader",
diff --git a/platform.py b/platform.py
index bd68da0..26b2ffe 100644
--- a/platform.py
+++ b/platform.py
@@ -12,10 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import copy
 import platform
 
-from platformio.managers.platform import PlatformBase
+from platformio.public import PlatformBase
 
 
 class RaspberrypiPlatform(PlatformBase):
@@ -39,16 +38,16 @@ class RaspberrypiPlatform(PlatformBase):
         if not any(jlink_conds) and jlink_pkgname in self.packages:
             del self.packages[jlink_pkgname]
 
-        return PlatformBase.configure_default_packages(self, variables, targets)
+        return super().configure_default_packages(variables, targets)
 
     def get_boards(self, id_=None):
-        result = PlatformBase.get_boards(self, id_)
+        result = super().get_boards(id_)
         if not result:
             return result
         if id_:
             return self._add_default_debug_tools(result)
         else:
-            for key, value in result.items():
+            for key in result:
                 result[key] = self._add_default_debug_tools(result[key])
         return result
 
@@ -102,7 +101,6 @@ class RaspberrypiPlatform(PlatformBase):
 
     def configure_debug_session(self, debug_config):
         adapter_speed = debug_config.speed or "5000"
-        
         server_options = debug_config.server or {}
         server_arguments = server_options.get("arguments", [])
         if "interface/cmsis-dap.cfg" in server_arguments: