diff --git a/HISTORY.rst b/HISTORY.rst
index 3be873ee..51bd288e 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -17,6 +17,7 @@ PlatformIO Core 6
 ~~~~~~~~~~~~~~~~~~
 
 * Fixed a regression bug when `libArchive <https://docs.platformio.org/en/latest/manifests/library-json/fields/build/libarchive.html>`__ option declared in the `library.json <https://docs.platformio.org/en/latest/manifests/library-json/index.html>`__ manifest was ignored (`issue #4351 <https://github.com/platformio/platformio-core/issues/4351>`_)
+* Fixed an issue when the `pio pkg publish <https://docs.platformio.org/en/latest/core/userguide/pkg/cmd_publish.html>`__ command didn't work with Python 3.6 (`issue #4352 <https://github.com/platformio/platformio-core/issues/4352>`_)
 
 6.1.1 (2022-07-11)
 ~~~~~~~~~~~~~~~~~~
diff --git a/platformio/compat.py b/platformio/compat.py
index 43eb98dd..cdce3939 100644
--- a/platformio/compat.py
+++ b/platformio/compat.py
@@ -41,6 +41,15 @@ def is_bytes(x):
     return isinstance(x, (bytes, memoryview, bytearray))
 
 
+def isascii(text):
+    if sys.version_info >= (3, 7):
+        return text.isascii()
+    for c in text or "":
+        if ord(c) > 127:
+            return False
+    return True
+
+
 def ci_strings_are_equal(a, b):
     if a == b:
         return True
diff --git a/platformio/package/commands/publish.py b/platformio/package/commands/publish.py
index 8d282fa0..58230eef 100644
--- a/platformio/package/commands/publish.py
+++ b/platformio/package/commands/publish.py
@@ -22,6 +22,7 @@ from tabulate import tabulate
 
 from platformio import fs
 from platformio.account.client import AccountClient
+from platformio.compat import isascii
 from platformio.exception import UserSideException
 from platformio.package.manifest.parser import ManifestParserFactory
 from platformio.package.manifest.schema import ManifestSchema
@@ -155,7 +156,7 @@ def package_publish_cmd(  # pylint: disable=too-many-arguments, too-many-locals
 def check_archive_file_names(archive_path):
     with tarfile.open(archive_path, mode="r:gz") as tf:
         for name in tf.getnames():
-            if not name.isascii():
+            if not isascii(name) or not name.isprintable():
                 click.secho(
                     f"Warning! The `{name}` file contains non-ASCII chars and can "
                     "lead to the unpacking issues on a user machine",