diff --git a/CHANGES.rst b/CHANGES.rst
index 96239a6e2..c79b9d1ef 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,12 @@ Changelog (Pillow)
 7.2.0 (unreleased)
 ------------------
 
+- Deprecate Image.show(command="...") #4646
+  [nulano, hugovk, radarhere]
+
+- Updated JPEG magic number #4707
+  [Cykooz, radarhere]
+
 - Change STRIPBYTECOUNTS to LONG if necessary when saving #4626
   [radarhere, hugovk]
 
diff --git a/Tests/images/imagedraw_wide_line_larger_than_int.png b/Tests/images/imagedraw_wide_line_larger_than_int.png
new file mode 100644
index 000000000..68073ce48
Binary files /dev/null and b/Tests/images/imagedraw_wide_line_larger_than_int.png differ
diff --git a/Tests/test_file_jpeg.py b/Tests/test_file_jpeg.py
index be8e21d5a..1801cd8ff 100644
--- a/Tests/test_file_jpeg.py
+++ b/Tests/test_file_jpeg.py
@@ -3,7 +3,14 @@ import re
 from io import BytesIO
 
 import pytest
-from PIL import ExifTags, Image, ImageFile, JpegImagePlugin, features
+from PIL import (
+    ExifTags,
+    Image,
+    ImageFile,
+    JpegImagePlugin,
+    UnidentifiedImageError,
+    features,
+)
 
 from .helper import (
     assert_image,
@@ -709,6 +716,24 @@ class TestFileJpeg:
         with Image.open("Tests/images/icc-after-SOF.jpg") as im:
             assert im.info["icc_profile"] == b"profile"
 
+    def test_jpeg_magic_number(self):
+        size = 4097
+        buffer = BytesIO(b"\xFF" * size)  # Many xFF bytes
+        buffer.max_pos = 0
+        orig_read = buffer.read
+
+        def read(n=-1):
+            res = orig_read(n)
+            buffer.max_pos = max(buffer.max_pos, buffer.tell())
+            return res
+
+        buffer.read = read
+        with pytest.raises(UnidentifiedImageError):
+            Image.open(buffer)
+
+        # Assert the entire file has not been read
+        assert 0 < buffer.max_pos < size
+
 
 @pytest.mark.skipif(not is_win32(), reason="Windows only")
 @skip_unless_feature("jpg")
diff --git a/Tests/test_image.py b/Tests/test_image.py
index 4d1b66dff..f284f89a7 100644
--- a/Tests/test_image.py
+++ b/Tests/test_image.py
@@ -664,6 +664,18 @@ class TestImage:
             except OSError as e:
                 assert str(e) == "buffer overrun when reading image file"
 
+    def test_show_deprecation(self, monkeypatch):
+        monkeypatch.setattr(Image, "_show", lambda *args, **kwargs: None)
+
+        im = Image.new("RGB", (50, 50), "white")
+
+        with pytest.warns(None) as raised:
+            im.show()
+        assert not raised
+
+        with pytest.warns(DeprecationWarning):
+            im.show(command="mock")
+
 
 class MockEncoder:
     pass
diff --git a/Tests/test_imagedraw.py b/Tests/test_imagedraw.py
index 08fb589fc..37bc99559 100644
--- a/Tests/test_imagedraw.py
+++ b/Tests/test_imagedraw.py
@@ -5,7 +5,7 @@ from PIL import Image, ImageColor, ImageDraw, ImageFont
 
 from .helper import (
     assert_image_equal,
-    assert_image_similar,
+    assert_image_similar_tofile,
     hopper,
     skip_unless_feature,
 )
@@ -71,7 +71,7 @@ def helper_arc(bbox, start, end):
     draw.arc(bbox, start, end)
 
     # Assert
-    assert_image_similar(im, Image.open("Tests/images/imagedraw_arc.png"), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_arc.png", 1)
 
 
 def test_arc1():
@@ -110,20 +110,19 @@ def test_arc_no_loops():
     draw.arc(BBOX1, start=start, end=end)
 
     # Assert
-    assert_image_similar(im, Image.open("Tests/images/imagedraw_arc_no_loops.png"), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_arc_no_loops.png", 1)
 
 
 def test_arc_width():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_arc_width.png"
 
     # Act
     draw.arc(BBOX1, 10, 260, width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_arc_width.png", 1)
 
 
 def test_arc_width_pieslice_large():
@@ -131,26 +130,24 @@ def test_arc_width_pieslice_large():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_arc_width_pieslice.png"
 
     # Act
     draw.arc(BBOX1, 10, 260, fill="yellow", width=100)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_arc_width_pieslice.png", 1)
 
 
 def test_arc_width_fill():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_arc_width_fill.png"
 
     # Act
     draw.arc(BBOX1, 10, 260, fill="yellow", width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_arc_width_fill.png", 1)
 
 
 def test_arc_width_non_whole_angle():
@@ -163,7 +160,7 @@ def test_arc_width_non_whole_angle():
     draw.arc(BBOX1, 10, 259.5, width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, expected, 1)
 
 
 def test_bitmap():
@@ -190,7 +187,7 @@ def helper_chord(mode, bbox, start, end):
     draw.chord(bbox, start, end, fill="red", outline="yellow")
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, expected, 1)
 
 
 def test_chord1():
@@ -209,26 +206,24 @@ def test_chord_width():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_chord_width.png"
 
     # Act
     draw.chord(BBOX1, 10, 260, outline="yellow", width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_chord_width.png", 1)
 
 
 def test_chord_width_fill():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_chord_width_fill.png"
 
     # Act
     draw.chord(BBOX1, 10, 260, fill="red", outline="yellow", width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_chord_width_fill.png", 1)
 
 
 def test_chord_zero_width():
@@ -254,7 +249,7 @@ def helper_ellipse(mode, bbox):
     draw.ellipse(bbox, fill="green", outline="blue")
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, expected, 1)
 
 
 def test_ellipse1():
@@ -276,8 +271,8 @@ def test_ellipse_translucent():
     draw.ellipse(BBOX1, fill=(0, 255, 0, 127))
 
     # Assert
-    expected = Image.open("Tests/images/imagedraw_ellipse_translucent.png")
-    assert_image_similar(im, expected, 1)
+    expected = "Tests/images/imagedraw_ellipse_translucent.png"
+    assert_image_similar_tofile(im, expected, 1)
 
 
 def test_ellipse_edge():
@@ -289,7 +284,7 @@ def test_ellipse_edge():
     draw.ellipse(((0, 0), (W - 1, H)), fill="white")
 
     # Assert
-    assert_image_similar(im, Image.open("Tests/images/imagedraw_ellipse_edge.png"), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_ellipse_edge.png", 1)
 
 
 def test_ellipse_symmetric():
@@ -304,39 +299,36 @@ def test_ellipse_width():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_ellipse_width.png"
 
     # Act
     draw.ellipse(BBOX1, outline="blue", width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_ellipse_width.png", 1)
 
 
 def test_ellipse_width_large():
     # Arrange
     im = Image.new("RGB", (500, 500))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_ellipse_width_large.png"
 
     # Act
     draw.ellipse((25, 25, 475, 475), outline="blue", width=75)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_ellipse_width_large.png", 1)
 
 
 def test_ellipse_width_fill():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_ellipse_width_fill.png"
 
     # Act
     draw.ellipse(BBOX1, fill="green", outline="blue", width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_ellipse_width_fill.png", 1)
 
 
 def test_ellipse_zero_width():
@@ -423,7 +415,7 @@ def helper_pieslice(bbox, start, end):
     draw.pieslice(bbox, start, end, fill="white", outline="blue")
 
     # Assert
-    assert_image_similar(im, Image.open("Tests/images/imagedraw_pieslice.png"), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_pieslice.png", 1)
 
 
 def test_pieslice1():
@@ -440,13 +432,12 @@ def test_pieslice_width():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_pieslice_width.png"
 
     # Act
     draw.pieslice(BBOX1, 10, 260, outline="blue", width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_pieslice_width.png", 1)
 
 
 def test_pieslice_width_fill():
@@ -459,7 +450,7 @@ def test_pieslice_width_fill():
     draw.pieslice(BBOX1, 10, 260, fill="white", outline="blue", width=5)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, expected, 1)
 
 
 def test_pieslice_zero_width():
@@ -571,13 +562,12 @@ def test_big_rectangle():
     im = Image.new("RGB", (W, H))
     bbox = [(-1, -1), (W + 1, H + 1)]
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_big_rectangle.png"
 
     # Act
     draw.rectangle(bbox, fill="orange")
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_big_rectangle.png", 1)
 
 
 def test_rectangle_width():
@@ -878,13 +868,25 @@ def test_wide_line_dot():
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_wide_line_dot.png"
 
     # Act
     draw.line([(50, 50), (50, 50)], width=3)
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 1)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_wide_line_dot.png", 1)
+
+
+def test_wide_line_larger_than_int():
+    # Arrange
+    im = Image.new("RGB", (W, H))
+    draw = ImageDraw.Draw(im)
+    expected = "Tests/images/imagedraw_wide_line_larger_than_int.png"
+
+    # Act
+    draw.line([(0, 0), (32768, 32768)], width=3)
+
+    # Assert
+    assert_image_similar_tofile(im, expected, 1)
 
 
 @pytest.mark.parametrize(
@@ -971,13 +973,12 @@ def test_wide_line_dot():
 def test_line_joint(xy):
     im = Image.new("RGB", (500, 325))
     draw = ImageDraw.Draw(im)
-    expected = "Tests/images/imagedraw_line_joint_curve.png"
 
     # Act
     draw.line(xy, GRAY, 50, "curve")
 
     # Assert
-    assert_image_similar(im, Image.open(expected), 3)
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_line_joint_curve.png", 3)
 
 
 def test_textsize_empty_string():
@@ -1018,8 +1019,8 @@ def test_stroke():
         draw.text((12, 12), "A", "#f00", font, stroke_width=2, stroke_fill=stroke_fill)
 
         # Assert
-        assert_image_similar(
-            im, Image.open("Tests/images/imagedraw_stroke_" + suffix + ".png"), 3.1
+        assert_image_similar_tofile(
+            im, "Tests/images/imagedraw_stroke_" + suffix + ".png", 3.1
         )
 
 
@@ -1034,9 +1035,7 @@ def test_stroke_descender():
     draw.text((12, 2), "y", "#f00", font, stroke_width=2, stroke_fill="#0f0")
 
     # Assert
-    assert_image_similar(
-        im, Image.open("Tests/images/imagedraw_stroke_descender.png"), 6.78
-    )
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_stroke_descender.png", 6.78)
 
 
 @skip_unless_feature("freetype2")
@@ -1052,9 +1051,7 @@ def test_stroke_multiline():
     )
 
     # Assert
-    assert_image_similar(
-        im, Image.open("Tests/images/imagedraw_stroke_multiline.png"), 3.3
-    )
+    assert_image_similar_tofile(im, "Tests/images/imagedraw_stroke_multiline.png", 3.3)
 
 
 def test_same_color_outline():
@@ -1093,4 +1090,4 @@ def test_same_color_outline():
                 expected = "Tests/images/imagedraw_outline_{}_{}.png".format(
                     operation, mode
                 )
-                assert_image_similar(im, Image.open(expected), 1)
+                assert_image_similar_tofile(im, expected, 1)
diff --git a/docs/deprecations.rst b/docs/deprecations.rst
index 885fba4cd..38d2143c4 100644
--- a/docs/deprecations.rst
+++ b/docs/deprecations.rst
@@ -12,6 +12,14 @@ Deprecated features
 Below are features which are considered deprecated. Where appropriate,
 a ``DeprecationWarning`` is issued.
 
+Image.show command parameter
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. deprecated:: 7.2.0
+
+The ``command`` parameter was deprecated and will be removed in a future release.
+Use a subclass of ``ImageShow.Viewer`` instead.
+
 ImageFile.raise_ioerror
 ~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/docs/releasenotes/7.2.0.rst b/docs/releasenotes/7.2.0.rst
index 26a1464a4..6b91a1b01 100644
--- a/docs/releasenotes/7.2.0.rst
+++ b/docs/releasenotes/7.2.0.rst
@@ -37,6 +37,12 @@ are now read as just a single bytestring.
 Deprecations
 ^^^^^^^^^^^^
 
+Image.show command parameter
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``command`` parameter was deprecated and will be removed in a future release.
+Use a subclass of :py:class:`PIL.ImageShow.Viewer` instead.
+
 ImageFile.raise_ioerror
 ~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/src/PIL/BmpImagePlugin.py b/src/PIL/BmpImagePlugin.py
index 85e2350c5..7bd5a0308 100644
--- a/src/PIL/BmpImagePlugin.py
+++ b/src/PIL/BmpImagePlugin.py
@@ -263,7 +263,7 @@ class BmpImageFile(ImageFile.ImageFile):
         # read 14 bytes: magic number, filesize, reserved, header final offset
         head_data = self.fp.read(14)
         # choke if the file does not have the required magic bytes
-        if head_data[0:2] != b"BM":
+        if not _accept(head_data):
             raise SyntaxError("Not a BMP file")
         # read the start position of the BMP image data (u32)
         offset = i32(head_data[10:14])
diff --git a/src/PIL/DcxImagePlugin.py b/src/PIL/DcxImagePlugin.py
index a12d9195b..de21db8f0 100644
--- a/src/PIL/DcxImagePlugin.py
+++ b/src/PIL/DcxImagePlugin.py
@@ -46,7 +46,7 @@ class DcxImageFile(PcxImageFile):
 
         # Header
         s = self.fp.read(4)
-        if i32(s) != MAGIC:
+        if not _accept(s):
             raise SyntaxError("not a DCX file")
 
         # Component directory
diff --git a/src/PIL/FliImagePlugin.py b/src/PIL/FliImagePlugin.py
index 989094569..f09d62ce3 100644
--- a/src/PIL/FliImagePlugin.py
+++ b/src/PIL/FliImagePlugin.py
@@ -42,9 +42,8 @@ class FliImageFile(ImageFile.ImageFile):
 
         # HEAD
         s = self.fp.read(128)
-        magic = i16(s[4:6])
         if not (
-            magic in [0xAF11, 0xAF12]
+            _accept(s)
             and i16(s[14:16]) in [0, 3]  # flags
             and s[20:22] == b"\x00\x00"  # reserved
         ):
@@ -60,6 +59,7 @@ class FliImageFile(ImageFile.ImageFile):
 
         # animation speed
         duration = i32(s[16:20])
+        magic = i16(s[4:6])
         if magic == 0xAF11:
             duration = (duration * 1000) // 70
         self.info["duration"] = duration
diff --git a/src/PIL/GifImagePlugin.py b/src/PIL/GifImagePlugin.py
index 9d360beae..6fd6182ab 100644
--- a/src/PIL/GifImagePlugin.py
+++ b/src/PIL/GifImagePlugin.py
@@ -63,7 +63,7 @@ class GifImageFile(ImageFile.ImageFile):
 
         # Screen
         s = self.fp.read(13)
-        if s[:6] not in [b"GIF87a", b"GIF89a"]:
+        if not _accept(s):
             raise SyntaxError("not a GIF file")
 
         self.info["version"] = s[:6]
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 2fc37d9ce..02c73bc49 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -2181,8 +2181,10 @@ class Image:
 
     def show(self, title=None, command=None):
         """
-        Displays this image. This method is mainly intended for
-        debugging purposes.
+        Displays this image. This method is mainly intended for debugging purposes.
+
+        This method calls :py:func:`PIL.ImageShow.show` internally. You can use
+        :py:func:`PIL.ImageShow.register` to override its default behaviour.
 
         The image is first saved to a temporary file. By default, it will be in
         PNG format.
@@ -2194,11 +2196,16 @@ class Image:
 
         On Windows, the image is opened with the standard PNG display utility.
 
-        :param title: Optional title to use for the image window,
-           where possible.
-        :param command: command used to show the image
+        :param title: Optional title to use for the image window, where possible.
         """
 
+        if command is not None:
+            warnings.warn(
+                "The command parameter is deprecated and will be removed in a future "
+                "release. Use a subclass of ImageShow.Viewer instead.",
+                DeprecationWarning,
+            )
+
         _show(self, title=title, command=command)
 
     def split(self):
diff --git a/src/PIL/JpegImagePlugin.py b/src/PIL/JpegImagePlugin.py
index 89e70f0e9..f846569b2 100644
--- a/src/PIL/JpegImagePlugin.py
+++ b/src/PIL/JpegImagePlugin.py
@@ -323,7 +323,8 @@ MARKER = {
 
 
 def _accept(prefix):
-    return prefix[0:1] == b"\377"
+    # Magic number was taken from https://en.wikipedia.org/wiki/JPEG
+    return prefix[0:3] == b"\xFF\xD8\xFF"
 
 
 ##
@@ -337,10 +338,11 @@ class JpegImageFile(ImageFile.ImageFile):
 
     def _open(self):
 
-        s = self.fp.read(1)
+        s = self.fp.read(3)
 
-        if i8(s) != 255:
+        if not _accept(s):
             raise SyntaxError("not a JPEG file")
+        s = b"\xFF"
 
         # Create attributes
         self.bits = self.layers = 0
diff --git a/src/PIL/MspImagePlugin.py b/src/PIL/MspImagePlugin.py
index 2b2937ecf..26acdd898 100644
--- a/src/PIL/MspImagePlugin.py
+++ b/src/PIL/MspImagePlugin.py
@@ -51,7 +51,7 @@ class MspImageFile(ImageFile.ImageFile):
 
         # Header
         s = self.fp.read(32)
-        if s[:4] not in [b"DanM", b"LinS"]:
+        if not _accept(s):
             raise SyntaxError("not an MSP file")
 
         # Header checksum
diff --git a/src/PIL/PixarImagePlugin.py b/src/PIL/PixarImagePlugin.py
index 5ea32ba89..91f0314b5 100644
--- a/src/PIL/PixarImagePlugin.py
+++ b/src/PIL/PixarImagePlugin.py
@@ -43,7 +43,7 @@ class PixarImageFile(ImageFile.ImageFile):
 
         # assuming a 4-byte magic label
         s = self.fp.read(4)
-        if s != b"\200\350\000\000":
+        if not _accept(s):
             raise SyntaxError("not a PIXAR file")
 
         # read rest of header
diff --git a/src/PIL/PngImagePlugin.py b/src/PIL/PngImagePlugin.py
index f62bf8542..51b78c7de 100644
--- a/src/PIL/PngImagePlugin.py
+++ b/src/PIL/PngImagePlugin.py
@@ -633,7 +633,7 @@ class PngImageFile(ImageFile.ImageFile):
 
     def _open(self):
 
-        if self.fp.read(8) != _MAGIC:
+        if not _accept(self.fp.read(8)):
             raise SyntaxError("not a PNG file")
         self.__fp = self.fp
         self.__frame = 0
diff --git a/src/PIL/PsdImagePlugin.py b/src/PIL/PsdImagePlugin.py
index 044df443d..89e55a4ce 100644
--- a/src/PIL/PsdImagePlugin.py
+++ b/src/PIL/PsdImagePlugin.py
@@ -61,7 +61,7 @@ class PsdImageFile(ImageFile.ImageFile):
         # header
 
         s = read(26)
-        if s[:4] != b"8BPS" or i16(s[4:]) != 1:
+        if not _accept(s) or i16(s[4:]) != 1:
             raise SyntaxError("not a PSD file")
 
         psd_bits = i16(s[22:])
diff --git a/src/PIL/SgiImagePlugin.py b/src/PIL/SgiImagePlugin.py
index ddd3de379..ec9855e77 100644
--- a/src/PIL/SgiImagePlugin.py
+++ b/src/PIL/SgiImagePlugin.py
@@ -58,8 +58,7 @@ class SgiImageFile(ImageFile.ImageFile):
         headlen = 512
         s = self.fp.read(headlen)
 
-        # magic number : 474
-        if i16(s) != 474:
+        if not _accept(s):
             raise ValueError("Not an SGI image file")
 
         # compression : verbatim or RLE
diff --git a/src/PIL/SunImagePlugin.py b/src/PIL/SunImagePlugin.py
index fd7ca8a40..d99884293 100644
--- a/src/PIL/SunImagePlugin.py
+++ b/src/PIL/SunImagePlugin.py
@@ -53,7 +53,7 @@ class SunImageFile(ImageFile.ImageFile):
 
         # HEAD
         s = self.fp.read(32)
-        if i32(s) != 0x59A66A95:
+        if not _accept(s):
             raise SyntaxError("not an SUN raster file")
 
         offset = 32
diff --git a/src/libImaging/Draw.c b/src/libImaging/Draw.c
index 947d7f70f..08f6c3843 100644
--- a/src/libImaging/Draw.c
+++ b/src/libImaging/Draw.c
@@ -683,7 +683,7 @@ ImagingDrawWideLine(Imaging im, int x0, int y0, int x1, int y1,
         return 0;
     }
 
-    big_hypotenuse = sqrt((double) (dx*dx + dy*dy));
+    big_hypotenuse = hypot(dx, dy);
     small_hypotenuse = (width - 1) / 2.0;
     ratio_max = ROUND_UP(small_hypotenuse) / big_hypotenuse;
     ratio_min = ROUND_DOWN(small_hypotenuse) / big_hypotenuse;
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index beafda4a4..553ed6365 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -251,9 +251,9 @@ deps = {
         "libs": [r"*.lib"],
     },
     "harfbuzz": {
-        "url": "https://github.com/harfbuzz/harfbuzz/archive/2.6.7.zip",
-        "filename": "harfbuzz-2.6.7.zip",
-        "dir": "harfbuzz-2.6.7",
+        "url": "https://github.com/harfbuzz/harfbuzz/archive/2.6.8.zip",
+        "filename": "harfbuzz-2.6.8.zip",
+        "dir": "harfbuzz-2.6.8",
         "build": [
             cmd_cmake("-DHB_HAVE_FREETYPE:BOOL=TRUE"),
             cmd_nmake(target="clean"),