diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 64c52956e..84db07b51 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -60,7 +60,7 @@ jobs:
             platform: macos
             os: macos-13
             cibw_arch: x86_64
-            build: "cp3{12,13}*"
+            build: "cp3{12,13,14}*"
             macosx_deployment_target: "10.13"
           - name: "macOS 10.15 x86_64"
             platform: macos
diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index 0f0886ab8..15f67385a 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -100,11 +100,11 @@ class TestFilePng:
             assert im.format == "PNG"
             assert im.get_format_mimetype() == "image/png"
 
-        for mode in ["1", "L", "P", "RGB", "I", "I;16", "I;16B"]:
+        for mode in ["1", "L", "P", "RGB", "I;16", "I;16B"]:
             im = hopper(mode)
             im.save(test_file)
             with Image.open(test_file) as reloaded:
-                if mode in ("I", "I;16B"):
+                if mode == "I;16B":
                     reloaded = reloaded.convert(mode)
                 assert_image_equal(reloaded, im)
 
@@ -801,6 +801,16 @@ class TestFilePng:
         with Image.open("Tests/images/truncated_end_chunk.png") as im:
             assert_image_equal_tofile(im, "Tests/images/hopper.png")
 
+    def test_deprecation(self, tmp_path: Path) -> None:
+        test_file = tmp_path / "out.png"
+
+        im = hopper("I")
+        with pytest.warns(DeprecationWarning):
+            im.save(test_file)
+
+        with Image.open(test_file) as reloaded:
+            assert_image_equal(im, reloaded.convert("I"))
+
 
 @pytest.mark.skipif(is_win32(), reason="Requires Unix or macOS")
 @skip_unless_feature("zlib")
diff --git a/docs/deprecations.rst b/docs/deprecations.rst
index 0490ba439..a36eb4aa7 100644
--- a/docs/deprecations.rst
+++ b/docs/deprecations.rst
@@ -193,6 +193,20 @@ Image.Image.get_child_images()
 method uses an image's file pointer, and so child images could only be retrieved from
 an :py:class:`PIL.ImageFile.ImageFile` instance.
 
+Saving I mode images as PNG
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. deprecated:: 11.3.0
+
+In order to fit the 32 bits of I mode images into PNG, when PNG images can only contain
+at most 16 bits for a channel, Pillow has been clipping the values. Rather than quietly
+changing the data, this is now deprecated. Instead, the image can be converted to
+another mode before saving::
+
+    from PIL import Image
+    im = Image.new("I", (1, 1))
+    im.convert("I;16").save("out.png")
+
 Removed features
 ----------------
 
diff --git a/docs/releasenotes/11.3.0.rst b/docs/releasenotes/11.3.0.rst
index 6bd4f7481..d2284c7ec 100644
--- a/docs/releasenotes/11.3.0.rst
+++ b/docs/releasenotes/11.3.0.rst
@@ -23,10 +23,17 @@ TODO
 Deprecations
 ============
 
-TODO
-^^^^
+Saving I mode images as PNG
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-TODO
+In order to fit the 32 bits of I mode images into PNG, when PNG images can only contain
+at most 16 bits for a channel, Pillow has been clipping the values. Rather than quietly
+changing the data, this is now deprecated. Instead, the image can be converted to
+another mode before saving::
+
+    from PIL import Image
+    im = Image.new("I", (1, 1))
+    im.convert("I;16").save("out.png")
 
 API changes
 ===========
diff --git a/setup.py b/setup.py
index 346d43463..1448c682f 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,6 @@ import subprocess
 import sys
 import warnings
 from collections.abc import Iterator
-from typing import Any
 
 from setuptools import Extension, setup
 from setuptools.command.build_ext import build_ext
@@ -148,7 +147,7 @@ class RequiredDependencyException(Exception):
 PLATFORM_MINGW = os.name == "nt" and "GCC" in sys.version
 
 
-def _dbg(s: str, tp: Any = None) -> None:
+def _dbg(s: str, tp: str | tuple[str, ...] | None = None) -> None:
     if DEBUG:
         if tp:
             print(s % tp)
@@ -522,11 +521,11 @@ class pil_build_ext(build_ext):
 
             if root is None and pkg_config:
                 if isinstance(lib_name, str):
-                    _dbg(f"Looking for `{lib_name}` using pkg-config.")
+                    _dbg("Looking for `%s` using pkg-config.", lib_name)
                     root = pkg_config(lib_name)
                 else:
                     for lib_name2 in lib_name:
-                        _dbg(f"Looking for `{lib_name2}` using pkg-config.")
+                        _dbg("Looking for `%s` using pkg-config.", lib_name2)
                         root = pkg_config(lib_name2)
                         if root:
                             break
@@ -757,7 +756,7 @@ class pil_build_ext(build_ext):
                             best_path = os.path.join(directory, name)
                             _dbg(
                                 "Best openjpeg version %s so far in %s",
-                                (best_version, best_path),
+                                (str(best_version), best_path),
                             )
 
             if best_version and _find_library_file(self, "openjp2"):
diff --git a/src/PIL/ImageCms.py b/src/PIL/ImageCms.py
index fdfbee789..a1584f111 100644
--- a/src/PIL/ImageCms.py
+++ b/src/PIL/ImageCms.py
@@ -248,6 +248,9 @@ class ImageCmsProfile:
             low-level profile object
 
         """
+        self.filename = None
+        self.product_name = None  # profile.product_name
+        self.product_info = None  # profile.product_info
 
         if isinstance(profile, str):
             if sys.platform == "win32":
@@ -256,23 +259,18 @@ class ImageCmsProfile:
                     profile_bytes_path.decode("ascii")
                 except UnicodeDecodeError:
                     with open(profile, "rb") as f:
-                        self._set(core.profile_frombytes(f.read()))
+                        self.profile = core.profile_frombytes(f.read())
                     return
-            self._set(core.profile_open(profile), profile)
+            self.filename = profile
+            self.profile = core.profile_open(profile)
         elif hasattr(profile, "read"):
-            self._set(core.profile_frombytes(profile.read()))
+            self.profile = core.profile_frombytes(profile.read())
         elif isinstance(profile, core.CmsProfile):
-            self._set(profile)
+            self.profile = profile
         else:
             msg = "Invalid type for Profile"  # type: ignore[unreachable]
             raise TypeError(msg)
 
-    def _set(self, profile: core.CmsProfile, filename: str | None = None) -> None:
-        self.profile = profile
-        self.filename = filename
-        self.product_name = None  # profile.product_name
-        self.product_info = None  # profile.product_info
-
     def tobytes(self) -> bytes:
         """
         Returns the profile in a format suitable for embedding in
diff --git a/src/PIL/PngImagePlugin.py b/src/PIL/PngImagePlugin.py
index f3815a122..1b9a89aef 100644
--- a/src/PIL/PngImagePlugin.py
+++ b/src/PIL/PngImagePlugin.py
@@ -48,6 +48,7 @@ from ._binary import i32be as i32
 from ._binary import o8
 from ._binary import o16be as o16
 from ._binary import o32be as o32
+from ._deprecate import deprecate
 from ._util import DeferredError
 
 TYPE_CHECKING = False
@@ -1368,6 +1369,8 @@ def _save(
     except KeyError as e:
         msg = f"cannot write mode {mode} as PNG"
         raise OSError(msg) from e
+    if outmode == "I":
+        deprecate("Saving I mode images as PNG", 13, stacklevel=4)
 
     #
     # write minimal PNG file
diff --git a/src/PIL/_deprecate.py b/src/PIL/_deprecate.py
index 9f9d8bbc9..170d44490 100644
--- a/src/PIL/_deprecate.py
+++ b/src/PIL/_deprecate.py
@@ -12,6 +12,7 @@ def deprecate(
     *,
     action: str | None = None,
     plural: bool = False,
+    stacklevel: int = 3,
 ) -> None:
     """
     Deprecations helper.
@@ -67,5 +68,5 @@ def deprecate(
     warnings.warn(
         f"{deprecated} {is_} deprecated and will be removed in {removed}{action}",
         DeprecationWarning,
-        stacklevel=3,
+        stacklevel=stacklevel,
     )
diff --git a/src/libImaging/TiffDecode.c b/src/libImaging/TiffDecode.c
index 2e83fb847..e289ce405 100644
--- a/src/libImaging/TiffDecode.c
+++ b/src/libImaging/TiffDecode.c
@@ -1032,7 +1032,10 @@ ImagingLibTiffEncode(Imaging im, ImagingCodecState state, UINT8 *buffer, int byt
                 TRACE(("Encode Error, row %d\n", state->y));
                 state->errcode = IMAGING_CODEC_BROKEN;
 
-                if (!clientstate->fp) {
+                if (clientstate->fp) {
+                    TIFFCleanup(tiff);
+                    clientstate->tiff = NULL;
+                } else {
                     free(clientstate->data);
                 }
                 return -1;
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index 098716b60..4baa5ccef 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -385,8 +385,8 @@ DEPS: dict[str, dict[str, Any]] = {
         "bins": [r"*.dll"],
     },
     "libavif": {
-        "url": f"https://github.com/AOMediaCodec/libavif/archive/v{V['LIBAVIF']}.zip",
-        "filename": f"libavif-{V['LIBAVIF']}.zip",
+        "url": f"https://github.com/AOMediaCodec/libavif/archive/v{V['LIBAVIF']}.tar.gz",
+        "filename": f"libavif-{V['LIBAVIF']}.tar.gz",
         "license": "LICENSE",
         "build": [
             "rustup update",