diff --git a/.github/workflows/test-cygwin.yml b/.github/workflows/test-cygwin.yml
index 5b0a03946..abfeaa77f 100644
--- a/.github/workflows/test-cygwin.yml
+++ b/.github/workflows/test-cygwin.yml
@@ -52,7 +52,7 @@ jobs:
           persist-credentials: false
 
       - name: Install Cygwin
-        uses: cygwin/cygwin-install-action@v4
+        uses: cygwin/cygwin-install-action@v5
         with:
           packages: >
             gcc-g++
diff --git a/.github/workflows/wheels-dependencies.sh b/.github/workflows/wheels-dependencies.sh
index 58621bca1..410255b7e 100755
--- a/.github/workflows/wheels-dependencies.sh
+++ b/.github/workflows/wheels-dependencies.sh
@@ -39,7 +39,7 @@ ARCHIVE_SDIR=pillow-depends-main
 # Package versions for fresh source builds
 FREETYPE_VERSION=2.13.3
 HARFBUZZ_VERSION=10.1.0
-LIBPNG_VERSION=1.6.44
+LIBPNG_VERSION=1.6.45
 JPEGTURBO_VERSION=3.1.0
 OPENJPEG_VERSION=2.5.3
 XZ_VERSION=5.6.3
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 3b22ee98a..fd89f7585 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -13,6 +13,7 @@ on:
     paths:
       - ".ci/requirements-cibw.txt"
       - ".github/workflows/wheel*"
+      - "pyproject.toml"
       - "setup.py"
       - "wheels/*"
       - "winbuild/build_prepare.py"
@@ -23,6 +24,7 @@ on:
     paths:
       - ".ci/requirements-cibw.txt"
       - ".github/workflows/wheel*"
+      - "pyproject.toml"
       - "setup.py"
       - "wheels/*"
       - "winbuild/build_prepare.py"
diff --git a/Tests/test_file_ico.py b/Tests/test_file_ico.py
index 37770498a..e81aae669 100644
--- a/Tests/test_file_ico.py
+++ b/Tests/test_file_ico.py
@@ -253,8 +253,7 @@ def test_truncated_mask() -> None:
 
     try:
         with Image.open(io.BytesIO(data)) as im:
-            with Image.open("Tests/images/hopper_mask.png") as expected:
-                assert im.mode == "1"
+            assert im.mode == "1"
 
         # 32 bpp
         output = io.BytesIO()
diff --git a/Tests/test_file_jpeg.py b/Tests/test_file_jpeg.py
index dd62460bb..4be9e16a7 100644
--- a/Tests/test_file_jpeg.py
+++ b/Tests/test_file_jpeg.py
@@ -181,7 +181,7 @@ class TestFileJpeg:
         assert test(100, 200) == (100, 200)
         assert test(0) is None  # square pixels
 
-    def test_dpi_jfif_cm(self):
+    def test_dpi_jfif_cm(self) -> None:
         with Image.open("Tests/images/jfif_unit_cm.jpg") as im:
             assert im.info["dpi"] == (2.54, 5.08)
 
@@ -281,7 +281,10 @@ class TestFileJpeg:
         assert not im2.info.get("progressive")
         assert im3.info.get("progressive")
 
-        assert_image_equal(im1, im3)
+        if features.check_feature("mozjpeg"):
+            assert_image_similar(im1, im3, 9.39)
+        else:
+            assert_image_equal(im1, im3)
         assert im1_bytes >= im3_bytes
 
     def test_progressive_large_buffer(self, tmp_path: Path) -> None:
@@ -423,8 +426,12 @@ class TestFileJpeg:
 
         im2 = self.roundtrip(hopper(), progressive=1)
         im3 = self.roundtrip(hopper(), progression=1)  # compatibility
-        assert_image_equal(im1, im2)
-        assert_image_equal(im1, im3)
+        if features.check_feature("mozjpeg"):
+            assert_image_similar(im1, im2, 9.39)
+            assert_image_similar(im1, im3, 9.39)
+        else:
+            assert_image_equal(im1, im2)
+            assert_image_equal(im1, im3)
         assert im2.info.get("progressive")
         assert im2.info.get("progression")
         assert im3.info.get("progressive")
@@ -1030,7 +1037,7 @@ class TestFileJpeg:
 
         with Image.open(TEST_FILE) as im:
             im.tile = [
-                ("INFINITE", (0, 0, 128, 128), 0, ("RGB", 0, 1)),
+                ImageFile._Tile("INFINITE", (0, 0, 128, 128), 0, ("RGB", 0, 1)),
             ]
             ImageFile.LOAD_TRUNCATED_IMAGES = True
             im.load()
diff --git a/Tests/test_file_libtiff.py b/Tests/test_file_libtiff.py
index 9c49b1534..49d71aca7 100644
--- a/Tests/test_file_libtiff.py
+++ b/Tests/test_file_libtiff.py
@@ -1146,7 +1146,7 @@ class TestFileLibTiff(LibTiffTestCase):
                 im.load()
 
             # Assert that the error code is IMAGING_CODEC_MEMORY
-            assert str(e.value) == "-9"
+            assert str(e.value) == "decoder error -9"
 
     @pytest.mark.parametrize("compression", ("tiff_adobe_deflate", "jpeg"))
     def test_save_multistrip(self, compression: str, tmp_path: Path) -> None:
diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index 974e1e75f..d87883279 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -618,7 +618,7 @@ class TestFilePng:
         with Image.open("Tests/images/truncated_image.png") as im:
             # The file is truncated
             with pytest.raises(OSError):
-                im.text()
+                im.text
             ImageFile.LOAD_TRUNCATED_IMAGES = True
             assert isinstance(im.text, dict)
             ImageFile.LOAD_TRUNCATED_IMAGES = False
diff --git a/Tests/test_file_spider.py b/Tests/test_file_spider.py
index 4cafda865..713db848d 100644
--- a/Tests/test_file_spider.py
+++ b/Tests/test_file_spider.py
@@ -7,7 +7,7 @@ from pathlib import Path
 
 import pytest
 
-from PIL import Image, ImageSequence, SpiderImagePlugin
+from PIL import Image, SpiderImagePlugin
 
 from .helper import assert_image_equal, hopper, is_pypy
 
@@ -153,8 +153,8 @@ def test_nonstack_file() -> None:
 
 def test_nonstack_dos() -> None:
     with Image.open(TEST_FILE) as im:
-        for i, frame in enumerate(ImageSequence.Iterator(im)):
-            assert i <= 1, "Non-stack DOS file test failed"
+        with pytest.raises(EOFError):
+            im.seek(0)
 
 
 # for issue #4093
diff --git a/Tests/test_file_tiff.py b/Tests/test_file_tiff.py
index dedd48c20..757d3f96a 100644
--- a/Tests/test_file_tiff.py
+++ b/Tests/test_file_tiff.py
@@ -117,10 +117,16 @@ class TestFileTiff:
 
     def test_bigtiff_save(self, tmp_path: Path) -> None:
         outfile = str(tmp_path / "temp.tif")
-        hopper().save(outfile, big_tiff=True)
+        im = hopper()
+        im.save(outfile, big_tiff=True)
 
-        with Image.open(outfile) as im:
-            assert im.tag_v2._bigtiff is True
+        with Image.open(outfile) as reloaded:
+            assert reloaded.tag_v2._bigtiff is True
+
+        im.save(outfile, save_all=True, append_images=[im], big_tiff=True)
+
+        with Image.open(outfile) as reloaded:
+            assert reloaded.tag_v2._bigtiff is True
 
     def test_seek_too_large(self) -> None:
         with pytest.raises(ValueError, match="Unable to seek to frame"):
@@ -740,7 +746,7 @@ class TestFileTiff:
             assert reread.n_frames == 3
 
     def test_fixoffsets(self) -> None:
-        b = BytesIO(b"II\x2a\x00\x00\x00\x00\x00")
+        b = BytesIO(b"II\x2A\x00\x00\x00\x00\x00")
         with TiffImagePlugin.AppendingTiffWriter(b) as a:
             b.seek(0)
             a.fixOffsets(1, isShort=True)
@@ -753,6 +759,37 @@ class TestFileTiff:
             with pytest.raises(RuntimeError):
                 a.fixOffsets(1)
 
+        b = BytesIO(b"II\x2A\x00\x00\x00\x00\x00")
+        with TiffImagePlugin.AppendingTiffWriter(b) as a:
+            a.offsetOfNewPage = 2**16
+
+            b.seek(0)
+            a.fixOffsets(1, isShort=True)
+
+        b = BytesIO(b"II\x2B\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
+        with TiffImagePlugin.AppendingTiffWriter(b) as a:
+            a.offsetOfNewPage = 2**32
+
+            b.seek(0)
+            a.fixOffsets(1, isShort=True)
+
+            b.seek(0)
+            a.fixOffsets(1, isLong=True)
+
+    def test_appending_tiff_writer_writelong(self) -> None:
+        data = b"II\x2A\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+        b = BytesIO(data)
+        with TiffImagePlugin.AppendingTiffWriter(b) as a:
+            a.writeLong(2**32 - 1)
+            assert b.getvalue() == data + b"\xff\xff\xff\xff"
+
+    def test_appending_tiff_writer_rewritelastshorttolong(self) -> None:
+        data = b"II\x2A\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+        b = BytesIO(data)
+        with TiffImagePlugin.AppendingTiffWriter(b) as a:
+            a.rewriteLastShortToLong(2**32 - 1)
+            assert b.getvalue() == data[:-2] + b"\xff\xff\xff\xff"
+
     def test_saving_icc_profile(self, tmp_path: Path) -> None:
         # Tests saving TIFF with icc_profile set.
         # At the time of writing this will only work for non-compressed tiffs
diff --git a/src/PIL/BlpImagePlugin.py b/src/PIL/BlpImagePlugin.py
index c932b3b9c..8585a8e60 100644
--- a/src/PIL/BlpImagePlugin.py
+++ b/src/PIL/BlpImagePlugin.py
@@ -374,14 +374,10 @@ class BLP1Decoder(_BLPBaseDecoder):
         image = JpegImageFile(BytesIO(data))
         Image._decompression_bomb_check(image.size)
         if image.mode == "CMYK":
-            decoder_name, extents, offset, args = image.tile[0]
+            args = image.tile[0].args
             assert isinstance(args, tuple)
-            image.tile = [
-                ImageFile._Tile(decoder_name, extents, offset, (args[0], "CMYK"))
-            ]
-        r, g, b = image.convert("RGB").split()
-        reversed_image = Image.merge("RGB", (b, g, r))
-        self.set_as_raw(reversed_image.tobytes())
+            image.tile = [image.tile[0]._replace(args=(args[0], "CMYK"))]
+        self.set_as_raw(image.convert("RGB").tobytes(), "BGR")
 
 
 class BLP2Decoder(_BLPBaseDecoder):
diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index 61eb15243..982096c9b 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -949,7 +949,7 @@ class ImageFileDirectory_v2(_IFDv2Base):
             warnings.warn(str(msg))
             return
 
-    def _get_ifh(self):
+    def _get_ifh(self) -> bytes:
         ifh = self._prefix + self._pack("H", 43 if self._bigtiff else 42)
         if self._bigtiff:
             ifh += self._pack("HH", 8, 0)
@@ -962,13 +962,16 @@ class ImageFileDirectory_v2(_IFDv2Base):
         result = self._pack("Q" if self._bigtiff else "H", len(self._tags_v2))
 
         entries: list[tuple[int, int, int, bytes, bytes]] = []
-        offset += len(result) + len(self._tags_v2) * (20 if self._bigtiff else 12) + 4
+
+        fmt = "Q" if self._bigtiff else "L"
+        fmt_size = 8 if self._bigtiff else 4
+        offset += (
+            len(result) + len(self._tags_v2) * (20 if self._bigtiff else 12) + fmt_size
+        )
         stripoffsets = None
 
         # pass 1: convert tags to binary format
         # always write tags in ascending order
-        fmt = "Q" if self._bigtiff else "L"
-        fmt_size = 8 if self._bigtiff else 4
         for tag, value in sorted(self._tags_v2.items()):
             if tag == STRIPOFFSETS:
                 stripoffsets = len(entries)
@@ -1024,7 +1027,7 @@ class ImageFileDirectory_v2(_IFDv2Base):
             )
 
         # -- overwrite here for multi-page --
-        result += b"\0\0\0\0"  # end of entries
+        result += self._pack(fmt, 0)  # end of entries
 
         # pass 3: write auxiliary data to file
         for tag, typ, count, value, data in entries:
@@ -1406,7 +1409,8 @@ class TiffImageFile(ImageFile.ImageFile):
             self.fp = None  # might be shared
 
         if err < 0:
-            raise OSError(err)
+            msg = f"decoder error {err}"
+            raise OSError(msg)
 
         return Image.Image.load(self)
 
@@ -2043,20 +2047,21 @@ class AppendingTiffWriter(io.BytesIO):
         self.offsetOfNewPage = 0
 
         self.IIMM = iimm = self.f.read(4)
+        self._bigtiff = b"\x2B" in iimm
         if not iimm:
             # empty file - first page
             self.isFirst = True
             return
 
         self.isFirst = False
-        if iimm == b"II\x2a\x00":
-            self.setEndian("<")
-        elif iimm == b"MM\x00\x2a":
-            self.setEndian(">")
-        else:
+        if iimm not in PREFIXES:
             msg = "Invalid TIFF file header"
             raise RuntimeError(msg)
 
+        self.setEndian("<" if iimm.startswith(II) else ">")
+
+        if self._bigtiff:
+            self.f.seek(4, os.SEEK_CUR)
         self.skipIFDs()
         self.goToEnd()
 
@@ -2076,11 +2081,13 @@ class AppendingTiffWriter(io.BytesIO):
             msg = "IIMM of new page doesn't match IIMM of first page"
             raise RuntimeError(msg)
 
-        ifd_offset = self.readLong()
+        if self._bigtiff:
+            self.f.seek(4, os.SEEK_CUR)
+        ifd_offset = self._read(8 if self._bigtiff else 4)
         ifd_offset += self.offsetOfNewPage
         assert self.whereToWriteNewIFDOffset is not None
         self.f.seek(self.whereToWriteNewIFDOffset)
-        self.writeLong(ifd_offset)
+        self._write(ifd_offset, 8 if self._bigtiff else 4)
         self.f.seek(ifd_offset)
         self.fixIFD()
 
@@ -2126,18 +2133,20 @@ class AppendingTiffWriter(io.BytesIO):
         self.endian = endian
         self.longFmt = f"{self.endian}L"
         self.shortFmt = f"{self.endian}H"
-        self.tagFormat = f"{self.endian}HHL"
+        self.tagFormat = f"{self.endian}HH" + ("Q" if self._bigtiff else "L")
 
     def skipIFDs(self) -> None:
         while True:
-            ifd_offset = self.readLong()
+            ifd_offset = self._read(8 if self._bigtiff else 4)
             if ifd_offset == 0:
-                self.whereToWriteNewIFDOffset = self.f.tell() - 4
+                self.whereToWriteNewIFDOffset = self.f.tell() - (
+                    8 if self._bigtiff else 4
+                )
                 break
 
             self.f.seek(ifd_offset)
-            num_tags = self.readShort()
-            self.f.seek(num_tags * 12, os.SEEK_CUR)
+            num_tags = self._read(8 if self._bigtiff else 2)
+            self.f.seek(num_tags * (20 if self._bigtiff else 12), os.SEEK_CUR)
 
     def write(self, data: Buffer, /) -> int:
         return self.f.write(data)
@@ -2167,17 +2176,19 @@ class AppendingTiffWriter(io.BytesIO):
             msg = f"wrote only {bytes_written} bytes but wanted {expected}"
             raise RuntimeError(msg)
 
-    def rewriteLastShortToLong(self, value: int) -> None:
-        self.f.seek(-2, os.SEEK_CUR)
-        bytes_written = self.f.write(struct.pack(self.longFmt, value))
-        self._verify_bytes_written(bytes_written, 4)
-
-    def _rewriteLast(self, value: int, field_size: int) -> None:
+    def _rewriteLast(
+        self, value: int, field_size: int, new_field_size: int = 0
+    ) -> None:
         self.f.seek(-field_size, os.SEEK_CUR)
+        if not new_field_size:
+            new_field_size = field_size
         bytes_written = self.f.write(
-            struct.pack(self.endian + self._fmt(field_size), value)
+            struct.pack(self.endian + self._fmt(new_field_size), value)
         )
-        self._verify_bytes_written(bytes_written, field_size)
+        self._verify_bytes_written(bytes_written, new_field_size)
+
+    def rewriteLastShortToLong(self, value: int) -> None:
+        self._rewriteLast(value, 2, 4)
 
     def rewriteLastShort(self, value: int) -> None:
         return self._rewriteLast(value, 2)
@@ -2185,13 +2196,17 @@ class AppendingTiffWriter(io.BytesIO):
     def rewriteLastLong(self, value: int) -> None:
         return self._rewriteLast(value, 4)
 
+    def _write(self, value: int, field_size: int) -> None:
+        bytes_written = self.f.write(
+            struct.pack(self.endian + self._fmt(field_size), value)
+        )
+        self._verify_bytes_written(bytes_written, field_size)
+
     def writeShort(self, value: int) -> None:
-        bytes_written = self.f.write(struct.pack(self.shortFmt, value))
-        self._verify_bytes_written(bytes_written, 2)
+        self._write(value, 2)
 
     def writeLong(self, value: int) -> None:
-        bytes_written = self.f.write(struct.pack(self.longFmt, value))
-        self._verify_bytes_written(bytes_written, 4)
+        self._write(value, 4)
 
     def close(self) -> None:
         self.finalize()
@@ -2199,24 +2214,27 @@ class AppendingTiffWriter(io.BytesIO):
             self.f.close()
 
     def fixIFD(self) -> None:
-        num_tags = self.readShort()
+        num_tags = self._read(8 if self._bigtiff else 2)
 
         for i in range(num_tags):
-            tag, field_type, count = struct.unpack(self.tagFormat, self.f.read(8))
+            tag, field_type, count = struct.unpack(
+                self.tagFormat, self.f.read(12 if self._bigtiff else 8)
+            )
 
             field_size = self.fieldSizes[field_type]
             total_size = field_size * count
-            is_local = total_size <= 4
+            fmt_size = 8 if self._bigtiff else 4
+            is_local = total_size <= fmt_size
             if not is_local:
-                offset = self.readLong() + self.offsetOfNewPage
-                self.rewriteLastLong(offset)
+                offset = self._read(fmt_size) + self.offsetOfNewPage
+                self._rewriteLast(offset, fmt_size)
 
             if tag in self.Tags:
                 cur_pos = self.f.tell()
 
                 if is_local:
                     self._fixOffsets(count, field_size)
-                    self.f.seek(cur_pos + 4)
+                    self.f.seek(cur_pos + fmt_size)
                 else:
                     self.f.seek(offset)
                     self._fixOffsets(count, field_size)
@@ -2224,24 +2242,33 @@ class AppendingTiffWriter(io.BytesIO):
 
             elif is_local:
                 # skip the locally stored value that is not an offset
-                self.f.seek(4, os.SEEK_CUR)
+                self.f.seek(fmt_size, os.SEEK_CUR)
 
     def _fixOffsets(self, count: int, field_size: int) -> None:
         for i in range(count):
             offset = self._read(field_size)
             offset += self.offsetOfNewPage
-            if field_size == 2 and offset >= 65536:
-                # offset is now too large - we must convert shorts to longs
+
+            new_field_size = 0
+            if self._bigtiff and field_size in (2, 4) and offset >= 2**32:
+                # offset is now too large - we must convert long to long8
+                new_field_size = 8
+            elif field_size == 2 and offset >= 2**16:
+                # offset is now too large - we must convert short to long
+                new_field_size = 4
+            if new_field_size:
                 if count != 1:
                     msg = "not implemented"
                     raise RuntimeError(msg)  # XXX TODO
 
                 # simple case - the offset is just one and therefore it is
                 # local (not referenced with another offset)
-                self.rewriteLastShortToLong(offset)
-                self.f.seek(-10, os.SEEK_CUR)
-                self.writeShort(TiffTags.LONG)  # rewrite the type to LONG
-                self.f.seek(8, os.SEEK_CUR)
+                self._rewriteLast(offset, field_size, new_field_size)
+                # Move back past the new offset, past 'count', and before 'field_type'
+                rewind = -new_field_size - 4 - 2
+                self.f.seek(rewind, os.SEEK_CUR)
+                self.writeShort(new_field_size)  # rewrite the type
+                self.f.seek(2 - rewind, os.SEEK_CUR)
             else:
                 self._rewriteLast(offset, field_size)
 
diff --git a/src/PIL/features.py b/src/PIL/features.py
index 3645e3def..ae7ea4255 100644
--- a/src/PIL/features.py
+++ b/src/PIL/features.py
@@ -127,6 +127,7 @@ features: dict[str, tuple[str, str | bool, str | None]] = {
     "fribidi": ("PIL._imagingft", "HAVE_FRIBIDI", "fribidi_version"),
     "harfbuzz": ("PIL._imagingft", "HAVE_HARFBUZZ", "harfbuzz_version"),
     "libjpeg_turbo": ("PIL._imaging", "HAVE_LIBJPEGTURBO", "libjpeg_turbo_version"),
+    "mozjpeg": ("PIL._imaging", "HAVE_MOZJPEG", "libjpeg_turbo_version"),
     "zlib_ng": ("PIL._imaging", "HAVE_ZLIBNG", "zlib_ng_version"),
     "libimagequant": ("PIL._imaging", "HAVE_LIBIMAGEQUANT", "imagequant_version"),
     "xcb": ("PIL._imaging", "HAVE_XCB", None),
@@ -300,7 +301,8 @@ def pilinfo(out: IO[str] | None = None, supported_formats: bool = True) -> None:
             if name == "jpg":
                 libjpeg_turbo_version = version_feature("libjpeg_turbo")
                 if libjpeg_turbo_version is not None:
-                    v = "libjpeg-turbo " + libjpeg_turbo_version
+                    v = "mozjpeg" if check_feature("mozjpeg") else "libjpeg-turbo"
+                    v += " " + libjpeg_turbo_version
             if v is None:
                 v = version(name)
             if v is not None:
diff --git a/src/_imaging.c b/src/_imaging.c
index 5d6d97bed..00772d012 100644
--- a/src/_imaging.c
+++ b/src/_imaging.c
@@ -76,6 +76,13 @@
 
 #ifdef HAVE_LIBJPEG
 #include "jconfig.h"
+#ifdef LIBJPEG_TURBO_VERSION
+#define JCONFIG_INCLUDED
+#ifdef __CYGWIN__
+#define _BASETSD_H
+#endif
+#include "jpeglib.h"
+#endif
 #endif
 
 #ifdef HAVE_LIBZ
@@ -4367,6 +4374,15 @@ setup_module(PyObject *m) {
     Py_INCREF(have_libjpegturbo);
     PyModule_AddObject(m, "HAVE_LIBJPEGTURBO", have_libjpegturbo);
 
+    PyObject *have_mozjpeg;
+#ifdef JPEG_C_PARAM_SUPPORTED
+    have_mozjpeg = Py_True;
+#else
+    have_mozjpeg = Py_False;
+#endif
+    Py_INCREF(have_mozjpeg);
+    PyModule_AddObject(m, "HAVE_MOZJPEG", have_mozjpeg);
+
     PyObject *have_libimagequant;
 #ifdef HAVE_LIBIMAGEQUANT
     have_libimagequant = Py_True;
diff --git a/src/_imagingft.c b/src/_imagingft.c
index d38279f3e..3a65007a5 100644
--- a/src/_imagingft.c
+++ b/src/_imagingft.c
@@ -339,29 +339,23 @@ text_layout_raqm(
         len = PySequence_Fast_GET_SIZE(seq);
         for (j = 0; j < len; j++) {
             PyObject *item = PySequence_Fast_GET_ITEM(seq, j);
-            char *feature = NULL;
-            Py_ssize_t size = 0;
-            PyObject *bytes;
-
             if (!PyUnicode_Check(item)) {
                 Py_DECREF(seq);
                 PyErr_SetString(PyExc_TypeError, "expected a string");
                 goto failed;
             }
-            bytes = PyUnicode_AsUTF8String(item);
-            if (bytes == NULL) {
+
+            Py_ssize_t size;
+            const char *feature = PyUnicode_AsUTF8AndSize(item, &size);
+            if (feature == NULL) {
                 Py_DECREF(seq);
                 goto failed;
             }
-            feature = PyBytes_AS_STRING(bytes);
-            size = PyBytes_GET_SIZE(bytes);
             if (!raqm_add_font_feature(rq, feature, size)) {
                 Py_DECREF(seq);
-                Py_DECREF(bytes);
                 PyErr_SetString(PyExc_ValueError, "raqm_add_font_feature() failed");
                 goto failed;
             }
-            Py_DECREF(bytes);
         }
         Py_DECREF(seq);
     }
diff --git a/src/libImaging/JpegEncode.c b/src/libImaging/JpegEncode.c
index 4372d51d5..3c11eac22 100644
--- a/src/libImaging/JpegEncode.c
+++ b/src/libImaging/JpegEncode.c
@@ -134,7 +134,16 @@ ImagingJpegEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
                     return -1;
             }
 
-            /* Compressor configuration */
+                /* Compressor configuration */
+#ifdef JPEG_C_PARAM_SUPPORTED
+            /* MozJPEG */
+            if (!context->progressive) {
+                /* Do not use MozJPEG progressive default */
+                jpeg_c_set_int_param(
+                    &context->cinfo, JINT_COMPRESS_PROFILE, JCP_FASTEST
+                );
+            }
+#endif
             jpeg_set_defaults(&context->cinfo);
 
             /* Prevent RGB -> YCbCr conversion */
diff --git a/src/libImaging/Unpack.c b/src/libImaging/Unpack.c
index e9203fe4d..9c3ee2665 100644
--- a/src/libImaging/Unpack.c
+++ b/src/libImaging/Unpack.c
@@ -1664,6 +1664,7 @@ static struct {
     {"RGBA", "RGBaXX", 48, unpackRGBaskip2},
     {"RGBA", "RGBa;16L", 64, unpackRGBa16L},
     {"RGBA", "RGBa;16B", 64, unpackRGBa16B},
+    {"RGBA", "BGR", 24, ImagingUnpackBGR},
     {"RGBA", "BGRa", 32, unpackBGRa},
     {"RGBA", "RGBA;I", 32, unpackRGBAI},
     {"RGBA", "RGBA;L", 32, unpackRGBAL},
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index 75d6aa1bd..b9695d1d8 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -116,14 +116,13 @@ V = {
     "HARFBUZZ": "10.1.0",
     "JPEGTURBO": "3.1.0",
     "LCMS2": "2.16",
-    "LIBPNG": "1.6.44",
+    "LIBPNG": "1.6.45",
     "LIBWEBP": "1.5.0",
     "OPENJPEG": "2.5.3",
     "TIFF": "4.6.0",
     "XZ": "5.6.3",
     "ZLIBNG": "2.2.3",
 }
-V["LIBPNG_DOTLESS"] = V["LIBPNG"].replace(".", "")
 V["LIBPNG_XY"] = "".join(V["LIBPNG"].split(".")[:2])
 
 
@@ -241,8 +240,8 @@ DEPS: dict[str, dict[str, Any]] = {
     },
     "libpng": {
         "url": f"{SF_PROJECTS}/libpng/files/libpng{V['LIBPNG_XY']}/{V['LIBPNG']}/"
-        f"lpng{V['LIBPNG_DOTLESS']}.zip/download",
-        "filename": f"lpng{V['LIBPNG_DOTLESS']}.zip",
+        f"FILENAME/download",
+        "filename": f"libpng-{V['LIBPNG']}.tar.gz",
         "license": "LICENSE",
         "build": [
             *cmds_cmake("png_static", "-DPNG_SHARED:BOOL=OFF", "-DPNG_TESTS:BOOL=OFF"),