diff --git a/changes.txt b/changes.txt
index 6a20b40c6..4c304b8e4 100644
--- a/changes.txt
+++ b/changes.txt
@@ -2,22 +2,22 @@ Change Log
 ==========
 
 
-**Changes in version **
+**Changes in version 1.26.4 **
 
-* Fixed issues:
+* Use MuPDF-1.26.6.
 
-  * **Fixed** `4462 <https://github.com/pymupdf/PyMuPDF/issues/4462>`_: delete_pages() does not accept a single int
-  * **Fixed** `4565 <https://github.com/pymupdf/PyMuPDF/issues/4565>`_: MacOS uses Tesseract and not Tesseract-OCR
-  * **Fixed** `4590 <https://github.com/pymupdf/PyMuPDF/issues/4590>`_: TypeError in utils.py scrub(): annot.update_file(buffer=...) is invalid
-  * **Fixed** `4614 <https://github.com/pymupdf/PyMuPDF/issues/4614>`_: Intercept bad widgets when inserting to another PDF
-  * **Fixed** `4639 <https://github.com/pymupdf/PyMuPDF/issues/4639>`_: pymupdf.mupdf.FzErrorGeneric: code=1: Director error: <class 'AttributeError'>: 'JM_new_bbox_device_Device' object has no attribute 'layer_name'
+* Fixed issues:
 
-* Fixed issues when built with MuPDF master:
   * **Fixed** `3806 <https://github.com/pymupdf/PyMuPDF/issues/3806>`_: pdf to image rendering ignore optional content offs
   * **Fixed** `4388 <https://github.com/pymupdf/PyMuPDF/issues/4388>`_: Incorrect PixMap from page due to cached data from other PDF
   * **Fixed** `4457 <https://github.com/pymupdf/PyMuPDF/issues/4457>`_: Wrong characters displayed after font subsetting (w/ native method)
+  * **Fixed** `4462 <https://github.com/pymupdf/PyMuPDF/issues/4462>`_: delete_pages() does not accept a single int
   * **Fixed** `4533 <https://github.com/pymupdf/PyMuPDF/issues/4533>`_: Open PDF error segmentation fault
+  * **Fixed** `4565 <https://github.com/pymupdf/PyMuPDF/issues/4565>`_: MacOS uses Tesseract and not Tesseract-OCR
   * **Fixed** `4571 <https://github.com/pymupdf/PyMuPDF/issues/4571>`_: Broken merged pdfs.
+  * **Fixed** `4590 <https://github.com/pymupdf/PyMuPDF/issues/4590>`_: TypeError in utils.py scrub(): annot.update_file(buffer=...) is invalid
+  * **Fixed** `4614 <https://github.com/pymupdf/PyMuPDF/issues/4614>`_: Intercept bad widgets when inserting to another PDF
+  * **Fixed** `4639 <https://github.com/pymupdf/PyMuPDF/issues/4639>`_: pymupdf.mupdf.FzErrorGeneric: code=1: Director error: <class 'AttributeError'>: 'JM_new_bbox_device_Device' object has no attribute 'layer_name'
 
 * Other:
   
diff --git a/tests/test_font.py b/tests/test_font.py
index 7cf1137b2..b7d2c223c 100644
--- a/tests/test_font.py
+++ b/tests/test_font.py
@@ -318,7 +318,7 @@ def test_4457():
         assert text_before == text
         assert rms_before == 0
         
-        if pymupdf.mupdf_version_tuple >= (1, 27):
+        if pymupdf.mupdf_version_tuple >= (1, 26, 6):
             assert rms_after == 0
         else:
             # As of 2025-05-20 there are some differences in some characters,
diff --git a/tests/test_general.py b/tests/test_general.py
index 8edc8dd8f..c00db47de 100644
--- a/tests/test_general.py
+++ b/tests/test_general.py
@@ -616,7 +616,7 @@ def test_2596():
     pix1 = page.get_pixmap()
     assert pix1.samples == pix0.samples
     rebased = hasattr(pymupdf, 'mupdf')
-    if pymupdf.mupdf_version_tuple < (1, 27):
+    if pymupdf.mupdf_version_tuple < (1, 26, 6):
         wt = pymupdf.TOOLS.mupdf_warnings()
         assert wt == 'too many indirections (possible indirection cycle involving 24 0 R)'