diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6ffc74b..8f8b429 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -28,10 +28,11 @@ jobs:
           - "3.12"
           - "3.13"
           - "3.13t"
-          # CPython 3.14 final is scheduled for October 2025:
-          # https://peps.python.org/pep-0719/
           - "3.14"
           - "3.14t"
+          # CPython 3.15 final is scheduled for October 2026:
+          # https://peps.python.org/pep-0790/
+          - "3.15-dev"
 
           # PyPy versions:
           # - https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md
@@ -72,6 +73,10 @@ jobs:
             python: "3.13"
           - os: windows-latest
             python: "3.13t"
+          - os: windows-latest
+            python: "3.14"
+          - os: windows-latest
+            python: "3.14t"
 
           # macOS
           # Python 3.9 is the oldest version available on macOS/arm64.
@@ -87,6 +92,10 @@ jobs:
             python: "3.13"
           - os: macos-latest
             python: "3.13t"
+          - os: macos-latest
+            python: "3.14"
+          - os: macos-latest
+            python: "3.14t"
 
           # Ubuntu: test deadsnakes Python versions which are not supported by
           # GHA python-versions.
diff --git a/docs/api.rst b/docs/api.rst
index 2b61a8d..a8c4c6f 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -7,7 +7,7 @@ functions for old Python versions.
 
 Supported Python versions:
 
-* Python 3.6 - 3.14
+* Python 3.6 - 3.15
 * PyPy 2.7 and PyPy 3.6 - 3.10
 
 Python 2.7 and Python 3.5 are no longer officially supported since GitHub
diff --git a/runtests.py b/runtests.py
index c858516..fdee19e 100755
--- a/runtests.py
+++ b/runtests.py
@@ -41,6 +41,11 @@
     "python3.11",
     "python3.12",
     "python3.13",
+    "python3.13t",
+    "python3.14",
+    "python3.14t",
+    "python3.15",
+    "python3.15t",
 
     # PyPy
     "pypy",