diff --git a/pkgs/applications/science/math/sage/patches/fonttools-deprecation-warnings.patch b/pkgs/applications/science/math/sage/patches/fonttools-deprecation-warnings.patch
deleted file mode 100644
index 93c03a04ddb1..000000000000
--- a/pkgs/applications/science/math/sage/patches/fonttools-deprecation-warnings.patch
+++ /dev/null
@@ -1,39 +0,0 @@
-diff --git a/src/doc/en/prep/Advanced-2DPlotting.rst b/src/doc/en/prep/Advanced-2DPlotting.rst
-index 337457afef..f7c76f4b56 100644
---- a/src/doc/en/prep/Advanced-2DPlotting.rst
-+++ b/src/doc/en/prep/Advanced-2DPlotting.rst
-@@ -695,6 +695,8 @@ by the cells.
- 
-     sage: pdf_savename = name+'.pdf'
-     sage: p.save(pdf_savename)
-+    ...
-+    DeprecationWarning: The py23 module has been deprecated and will be removed in a future release. Please update your code.
- 
- Notably, we can export in formats ready for inclusion in web pages.
- 
-diff --git a/src/sage/plot/disk.py b/src/sage/plot/disk.py
-index 8680a1c9b1..e83763b678 100644
---- a/src/sage/plot/disk.py
-+++ b/src/sage/plot/disk.py
-@@ -156,6 +156,8 @@ class Disk(GraphicPrimitive):
-             sage: f = tmp_filename(ext='.pdf')
-             sage: p = disk((0,0), 5, (0, pi/4), alpha=0.5)
-             sage: p.save(f)
-+            ...
-+            DeprecationWarning: The py23 module has been deprecated and will be removed in a future release. Please update your code.
- 
-         """
-         import matplotlib.patches as patches
-diff --git a/src/sage/plot/text.py b/src/sage/plot/text.py
-index 04cbdedf76..a970f97b79 100644
---- a/src/sage/plot/text.py
-+++ b/src/sage/plot/text.py
-@@ -325,6 +325,8 @@ def text(string, xy, **options):
-     You can save text as part of PDF output::
- 
-         sage: text("sage", (0,0), rgbcolor=(0,0,0)).save(os.path.join(SAGE_TMP, 'a.pdf'))
-+        ...
-+        DeprecationWarning: The py23 module has been deprecated and will be removed in a future release. Please update your code.
- 
-     Some examples of bounding box::
- 
diff --git a/pkgs/applications/science/math/sage/sage-src.nix b/pkgs/applications/science/math/sage/sage-src.nix
index a51e92cde52e..95b01d9f3f58 100644
--- a/pkgs/applications/science/math/sage/sage-src.nix
+++ b/pkgs/applications/science/math/sage/sage-src.nix
@@ -114,14 +114,6 @@ stdenv.mkDerivation rec {
     # strictly necessary, but keeps us from littering in the user's HOME.
     ./patches/sympow-cache.patch
 
-    # fonttools 4.26.2, used by matplotlib, uses deprecated methods internally.
-    # This is fixed in fonttools 4.27.0, but since fonttools is a dependency of
-    # 2000+ packages and DeprecationWarnings are hidden almost everywhere by
-    # default (not on Sage's doctest harness, though), it doesn't make sense to
-    # backport the fix (see https://github.com/NixOS/nixpkgs/pull/151415).
-    # Let's just assume warnings are expected until we update to 4.27.0.
-    ./patches/fonttools-deprecation-warnings.patch
-
     # https://trac.sagemath.org/ticket/32968
     (fetchSageDiff {
       base = "9.5.beta8";