diff --git a/docs/src/whatsnew/3.14.rst b/docs/src/whatsnew/3.14.rst
index 7822c900a9..823a3249c4 100644
--- a/docs/src/whatsnew/3.14.rst
+++ b/docs/src/whatsnew/3.14.rst
@@ -60,6 +60,9 @@ v3.14.1 (Date TBD)
    #. Fixed compatibility with NumPy v2 for :meth:`~iris.coords.Coord.guess_bounds`
       :ref:`See the full entry for more<3_14_1_guess_bounds>`.
 
+   #. Tentative compatibility with Python 3.14, pending full CI support later.
+      :ref:`See Dependencies for more<3_14_dependencies>`.
+
 ✨ Features
 ===========
 
@@ -166,6 +169,8 @@ v3.14.1 (Date TBD)
    exceed the optimum chunksize set in dask. (:pull:`6730`)
 
 
+.. _3_14_dependencies:
+
 🔗 Dependencies
 ===============
 
@@ -174,10 +179,16 @@ v3.14.1 (Date TBD)
    handles additional shapefile types and projections. (:issue:`6126`, :pull:`6129`)
 
 #. `@pp-mo`_ added a temporary dependency pins for Python<3.14, dask<2025.10.0 and
-   netCDF4<1.7.3.  All of these introduce problems that won't necessarily be fixed soon,
-   so we anticipate that these pins will be wanted for the v3.14 release.
+   netCDF4<1.7.3.  Edit 2025-12-03: the Python pin has now been removed in
+   :pull:`6817`.
    (:issue:`6775`, :issue:`6776`, :issue:`6777`, :pull:`6773`)
 
+#. `@trexfeathers`_ provided tentative compatibility with Python 3.14 by fixing
+   :class:`~iris.coords.DimCoord` ``deepcopy`` behaviour. Note that CI coverage
+   for Python 3.14 is not yet possible due to problems in some fringe
+   dependencies, but the relevant tests have been shown to pass in :pull:`6816`.
+   (:issue:`6775`, :pull:`6817`)
+
 
 📚 Documentation
 ================
diff --git a/docs/src/whatsnew/index.rst b/docs/src/whatsnew/index.rst
index 56eca8c11b..ba9548c467 100644
--- a/docs/src/whatsnew/index.rst
+++ b/docs/src/whatsnew/index.rst
@@ -6,11 +6,15 @@
 What's New in Iris
 ------------------
 
-.. include:: 3.14.rst
+.. Commented out temporarily because Sphinx can't cope with a file that includes
+   labels being referenced twice.
+   include:: 3.14.rst
+   toctree::
+   :maxdepth: 1
+   :hidden:
 
 .. toctree::
    :maxdepth: 1
-   :hidden:
 
    3.14.rst
    3.13.rst
diff --git a/lib/iris/coords.py b/lib/iris/coords.py
index 8b7b30f334..1013353759 100644
--- a/lib/iris/coords.py
+++ b/lib/iris/coords.py
@@ -2798,13 +2798,15 @@ def __init__(
         #: Whether the coordinate wraps by ``coord.units.modulus``.
         self.circular = circular
 
-    def __deepcopy__(self, memo):  # numpydoc ignore=SS02
-        """coord.__deepcopy__() -> Deep copy of coordinate.
+    def __deepcopy__(self, memo):
+        """Return a deep copy of the DimCoord, with read-only points and bounds."""
+        # Inspired by matplotlib#30198.
+        # Replicates the default copy behaviour, which can then be modified below.
+        cls = self.__class__
+        memo[id(self)] = new_coord = cls.__new__(cls)
+        for key, val in self.__dict__.items():
+            setattr(new_coord, key, copy.deepcopy(val, memo))
 
-        Used if copy.deepcopy is called on a coordinate.
-
-        """
-        new_coord = copy.deepcopy(super(), memo)
         # Ensure points and bounds arrays are read-only.
         new_coord._values_dm.data.flags.writeable = False
         if new_coord._bounds_dm is not None:
diff --git a/pyproject.toml b/pyproject.toml
index 02036fb046..ae99aaa554 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,9 +50,7 @@ keywords = [
 license = "BSD-3-Clause"
 license-files = ["LICENSE"]
 name = "scitools-iris"
-# NOTE: currently pinning to avoid Python 3.14
-#  see : https://github.com/SciTools/iris/issues/6775
-requires-python = ">=3.11,<3.14"
+requires-python = ">=3.11"
 
 [project.urls]
 Code = "https://github.com/SciTools/iris"