diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 6aa0363a..49629c1b 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -117,7 +117,7 @@ jobs:
           path: dist
 
       - name: Install cibuildwheel
-        run: python -m pip install cibuildwheel~=3.3
+        run: python -m pip install cibuildwheel~=4.3.1
 
       - name: Build wheels
         shell: bash
@@ -180,7 +180,7 @@ jobs:
           path: dist
 
       - name: Install cibuildwheel
-        run: python -m pip install cibuildwheel~=3.3
+        run: python -m pip install cibuildwheel~=4.3.1
 
       - name: Build wheels
         shell: bash
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10c65c0a..b26b999d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 1.21.0 (UNRELEASED)
+
+- Add support for Python 3.15
+
 # 1.20.1 (2026-09-12)
 
 - Update wheels to libgit2 1.9.7
diff --git a/README.md b/README.md
index 3d0891e9..c59c8d75 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # pygit2 - libgit2 bindings in Python
 
 Bindings to the libgit2 shared library, implements Git plumbing.
-Supports Python 3.11 to 3.14 and PyPy3 7.3+
+Supports Python 3.11 to 3.15 and PyPy3 7.3+
 
 [![test-ci-badge][test-ci-badge]][test-ci-link]
 [![deploy-ci-badge][deploy-ci-badge]][deploy-ci-link]
diff --git a/docs/index.rst b/docs/index.rst
index af3380e5..9d5da98d 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -3,7 +3,7 @@ pygit2 - libgit2 bindings in Python
 ######################################################################
 
 Bindings to the libgit2 shared library, implements Git plumbing.
-Supports Python 3.11 to 3.14 and PyPy3 7.3+
+Supports Python 3.11 to 3.15 and PyPy3 7.3+
 
 Links
 =====================================
diff --git a/docs/install.rst b/docs/install.rst
index 54bb07dc..9116c477 100644
--- a/docs/install.rst
+++ b/docs/install.rst
@@ -46,7 +46,7 @@ Requirements
 
 Supported versions of Python:
 
-- Python 3.11 to 3.14
+- Python 3.11 to 3.15
 - PyPy3 7.3+
 
 Python requirements (these are specified in ``setup.py``):
@@ -83,7 +83,7 @@ of Python and the required libgit2 version.
 +-------------+----------------+------------+
 | pygit2      | Python         | libgit2    |
 +-------------+----------------+------------+
-| 1.19 - 1.20 | 3.11 - 3.14(t) | 1.9        |
+| 1.19 - 1.20 | 3.11 - 3.15(t) | 1.9        |
 +-------------+----------------+------------+
 | 1.17 - 1.18 | 3.10 - 3.13    | 1.9        |
 +-------------+----------------+------------+
diff --git a/setup.py b/setup.py
index 778a6c0e..51d9da59 100644
--- a/setup.py
+++ b/setup.py
@@ -81,6 +81,7 @@ def exclude(line: str) -> bool:
     'Programming Language :: Python :: 3.12',
     'Programming Language :: Python :: 3.13',
     'Programming Language :: Python :: 3.14',
+    'Programming Language :: Python :: 3.15',
     'Programming Language :: Python :: Implementation :: PyPy',
     'Programming Language :: Python :: Implementation :: CPython',
     'Topic :: Software Development :: Version Control',