diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
index 1b6439492..37320288b 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.yml
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -46,6 +46,7 @@ body:
     attributes:
       label: PyMuPDF version
       options:
+        - 1.27.1
         - 1.27.0
         - 1.26.7
         - 1.26.6
diff --git a/changes.txt b/changes.txt
index 5b7d4cde5..8927235bb 100644
--- a/changes.txt
+++ b/changes.txt
@@ -2,19 +2,27 @@ Change Log
 ==========
 
 
-**Changes in version 1.27.0** ()
+**Changes in version 1.27.1** ()
 
-* Use MuPDF-1.27.0.
+* Use MuPDF-1.27.1.
 
 * Fixed issues:
 
   * **Fixed** `2883 <https://github.com/pymupdf/PyMuPDF/issues/2883>`_: Improve the Python type annotations for fitz_new
+  * **Fixed** `4599 <https://github.com/pymupdf/PyMuPDF/issues/4599>`_: page.cluster_drawings extract a lot of small clusters once upgraded to 1.26
   * **Fixed** `4751 <https://github.com/pymupdf/PyMuPDF/issues/4751>`_: Memory leaking in page.widgets()
+  * **Fixed** `4762 <https://github.com/pymupdf/PyMuPDF/issues/4762>`_: Importing pymupdf make pillow segmentation fault for converting jp2 file on ArchLinux
 
 * Other:
 
   * Added `pymupdf.TEXT_CLIP`.
   * Removed support for mupdf < 1.26.
+  * Partial fix of `4790 <https://github.com/pymupdf/PyMuPDF/issues/4790>`_: Problem to delete pages on PDF
+    
+    * New arg `raise_on_repair` in `Document.save()`.
+    * New method `Document.repair()`.
+
+  * Added py.typed file for type checkers.
 
 
 **Changes in version 1.26.7** (2025-12-11)
diff --git a/setup.py b/setup.py
index 49da50e50..fbab3ce9a 100755
--- a/setup.py
+++ b/setup.py
@@ -797,25 +797,35 @@ def build_mupdf_windows(
         ):
     
     assert mupdf_local
-
-    if overwrite_config:
-        mupdf_config_h = f'{mupdf_local}/include/mupdf/fitz/config.h'
-        prefix = '#define TOFU_CJK_EXT 1 /* PyMuPDF override. */\n'
-        with open(mupdf_config_h) as f:
-            text = f.read()
-        if text.startswith(prefix):
-            print(f'Not modifying {mupdf_config_h} because already has prefix {prefix!r}.')
-        else:
-            print(f'Prefixing {mupdf_config_h} with {prefix!r}.')
-            text = prefix + text
-            st = os.stat(mupdf_config_h)
-            with open(mupdf_config_h, 'w') as f:
-                f.write(text)
-            os.utime(mupdf_config_h, (st.st_atime, st.st_mtime))
-        
+    mupdf_version_tuple = get_mupdf_version(mupdf_local)
+    log(f'{overwrite_config=}')
+    log(f'{mupdf_version_tuple=}')
     wp = pipcl.wdev.WindowsPython()
     tesseract = '' if os.environ.get('PYMUPDF_SETUP_MUPDF_TESSERACT') == '0' else 'tesseract-'
     windows_build_tail = f'build\\shared-{tesseract}{build_type}'
+    
+    if overwrite_config:
+        if mupdf_version_tuple >= (1, 28):
+            # Tell mupdf build to use, for example, `/Build "ReleaseTofuCjkExt|x64"`.
+            # This avoids the need for us to modify mupdf's config.h.
+            windows_build_tail += '-TOFU_CJK_EXT'
+            log(f'Appending, {windows_build_tail=}')
+        else:
+            log(f'modifying mupdf:include/mupdf/fitz/config.h')
+            mupdf_config_h = f'{mupdf_local}/include/mupdf/fitz/config.h'
+            prefix = '#define TOFU_CJK_EXT 1 /* PyMuPDF override. */\n'
+            with open(mupdf_config_h) as f:
+                text = f.read()
+            if text.startswith(prefix):
+                log(f'Not modifying {mupdf_config_h} because already has prefix {prefix!r}.')
+            else:
+                log(f'Prefixing {mupdf_config_h} with {prefix!r}.')
+                text = prefix + text
+                st = os.stat(mupdf_config_h)
+                with open(mupdf_config_h, 'w') as f:
+                    f.write(text)
+                os.utime(mupdf_config_h, (st.st_atime, st.st_mtime))
+    
     if g_py_limited_api:
         windows_build_tail += f'-Py_LIMITED_API_{pipcl.current_py_limited_api()}'
     windows_build_tail += f'-x{wp.cpu.bits}-py{wp.version}'
@@ -1273,9 +1283,9 @@ def sdist():
 #
 
 # PyMuPDF version.
-version_p = '1.27.0'
+version_p = '1.27.1'
 
-version_mupdf = '1.27.0'
+version_mupdf = '1.27.1'
 
 # PyMuPDFb version. This is the PyMuPDF version whose PyMuPDFb wheels we will
 # (re)use if generating separate PyMuPDFb wheels. Though as of PyMuPDF-1.24.11
diff --git a/src/__init__.py b/src/__init__.py
index 14953b10e..ab4ab9161 100644
--- a/src/__init__.py
+++ b/src/__init__.py
@@ -7865,6 +7865,7 @@ def write(
             preserve_metadata=1,
             use_objstms=0,
             compression_effort=0,
+            raise_on_repair=False,
     ):
         from io import BytesIO
         bio = BytesIO()
@@ -7889,6 +7890,7 @@ def write(
                 preserve_metadata=preserve_metadata,
                 use_objstms=use_objstms,
                 compression_effort=compression_effort,
+                raise_on_repair=raise_on_repair,
         )
         return bio.getvalue()
     
diff --git a/tests/resources/test_4599.pdf b/tests/resources/test_4599.pdf
new file mode 100644
index 000000000..8f8ad9eb7
Binary files /dev/null and b/tests/resources/test_4599.pdf differ
diff --git a/tests/test_cluster_drawings.py b/tests/test_cluster_drawings.py
index 08fe23214..5dc739af1 100644
--- a/tests/test_cluster_drawings.py
+++ b/tests/test_cluster_drawings.py
@@ -45,3 +45,17 @@ def test_cluster3():
     page.draw_rect(r1)
     page.draw_rect(r2)
     assert page.cluster_drawings() == [r1, r2]
+
+
+def test_4599():
+    print()
+    path = os.path.normpath(f'{__file__}/../../tests/resources/test_4599.pdf')
+    n = 0
+    with pymupdf.open(path) as document:
+        for page in document:
+            for clip in page.cluster_drawings():
+                print(clip)
+                n += 1
+    assert n == 3
+    
+