diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index a6f9551d07..ba68d395fa 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -60,7 +60,6 @@ jobs:
         make -C examples/natmod/heapq
         make -C examples/natmod/random
         make -C examples/natmod/re
-        make -C examples/natmod/zlib
     - name: Test native modules
       if: matrix.test == 'all'
       run: ./run-natmodtests.py extmod/{heapq*,re*,zlib*}.py
diff --git a/docs/library/gzip.rst b/docs/library/gzip.rst
deleted file mode 100644
index f36f896db3..0000000000
--- a/docs/library/gzip.rst
+++ /dev/null
@@ -1,106 +0,0 @@
-:mod:`gzip` -- gzip compression & decompression
-===============================================
-
-.. module:: gzip
-   :synopsis: gzip compression & decompression
-
-|see_cpython_module| :mod:`python:gzip`.
-
-This module allows compression and decompression of binary data with the
-`DEFLATE algorithm <https://en.wikipedia.org/wiki/DEFLATE>`_ used by the gzip
-file format.
-
-.. note:: Prefer to use :class:`deflate.DeflateIO` instead of the functions in this
-   module as it provides a streaming interface to compression and decompression
-   which is convenient and more memory efficient when working with reading or
-   writing compressed data to a file, socket, or stream.
-
-**Availability:**
-
-* This module is **not present by default** in official MicroPython firmware
-  releases as it duplicates functionality available in the :mod:`deflate
-  <deflate>` module.
-
-* A copy of this module can be installed (or frozen)
-  from :term:`micropython-lib` (`source <https://github.com/micropython/micropython-lib/blob/master/python-stdlib/gzip/gzip.py>`_).
-  See :ref:`packages` for more information. This documentation describes that module.
-
-* Compression support will only be available if compression support is enabled
-  in the built-in :mod:`deflate <deflate>` module.
-
-Functions
----------
-
-.. function:: open(filename, mode, /)
-
-   Wrapper around built-in :func:`open` returning a GzipFile instance.
-
-.. function:: decompress(data, /)
-
-   Decompresses *data* into a bytes object.
-
-.. function:: compress(data, /)
-
-   Compresses *data* into a bytes object.
-
-Classes
--------
-
-.. class:: GzipFile(*, fileobj, mode)
-
-   This class can be used to wrap a *fileobj* which is any
-   :term:`stream-like <stream>` object such as a file, socket, or stream
-   (including :class:`io.BytesIO`). It is itself a stream and implements the
-   standard read/readinto/write/close methods.
-
-   When the *mode* argument is ``"rb"``, reads from the GzipFile instance will
-   decompress the data in the underlying stream and return decompressed data.
-
-   If compression support is enabled then the *mode* argument can be set to
-   ``"wb"``, and writes to the GzipFile instance will be compressed and written
-   to the underlying stream.
-
-   By default the GzipFile class will read and write data using the gzip file
-   format, including a header and footer with checksum and a window size of 512
-   bytes.
-
-   The **file**, **compresslevel**, and **mtime** arguments are not
-   supported. **fileobj** and **mode** must always be specified as keyword
-   arguments.
-
-Examples
---------
-
-A typical use case for :class:`gzip.GzipFile` is to read or write a compressed
-file from storage:
-
-.. code:: python
-
-   import gzip
-
-   # Reading:
-   with open("data.gz", "rb") as f:
-       with gzip.GzipFile(fileobj=f, mode="rb") as g:
-           # Use g.read(), g.readinto(), etc.
-
-    # Same, but using gzip.open:
-   with gzip.open("data.gz", "rb") as f:
-        # Use f.read(), f.readinto(), etc.
-
-   # Writing:
-   with open("data.gz", "wb") as f:
-       with gzip.GzipFile(fileobj=f, mode="wb") as g:
-           # Use g.write(...) etc
-
-   # Same, but using gzip.open:
-   with gzip.open("data.gz", "wb") as f:
-       # Use f.write(...) etc
-
-   # Write a dictionary as JSON in gzip format, with a
-   # small (64 byte) window size.
-   config = { ... }
-   with gzip.open("config.gz", "wb") as f:
-       json.dump(config, f)
-
-For guidance on working with gzip sources and choosing the window size see the
-note at the :ref:`end of the deflate documentation <deflate_wbits>`.
diff --git a/lib/mbedtls b/lib/mbedtls
new file mode 160000
index 0000000000..1bc2c9cb8b
--- /dev/null
+++ b/lib/mbedtls
@@ -0,0 +1 @@
+Subproject commit 1bc2c9cb8b8fe4659bd94b8ebba5a4c02029b7fa