diff --git a/.github/workflows/autofix.yml b/.github/workflows/autofix.yml
index d8bc57bffd7..536df35961b 100644
--- a/.github/workflows/autofix.yml
+++ b/.github/workflows/autofix.yml
@@ -42,7 +42,7 @@ jobs:
       uses: actions/setup-python@v6
       with:
         # Keep in sync with defaultPythonVersion in testAndPublish.yml.
-        python-version: '3.13.13'
+        python-version: '3.13.15'
     - name: Install the latest version of uv
       uses: astral-sh/setup-uv@v7
       with:
diff --git a/.github/workflows/fetch-crowdin-translations.yml b/.github/workflows/fetch-crowdin-translations.yml
index a11f2fe2d0a..13a3d8e48ab 100644
--- a/.github/workflows/fetch-crowdin-translations.yml
+++ b/.github/workflows/fetch-crowdin-translations.yml
@@ -46,7 +46,7 @@ jobs:
     - name: Set up python
       uses: actions/setup-python@v7
       with:
-        python-version: '3.13.13'
+        python-version: '3.13.15'
         architecture: 'x64'
 
     - name: setup uv
diff --git a/.github/workflows/testAndPublish.yml b/.github/workflows/testAndPublish.yml
index 6d6669c2b30..41b54bdaaf2 100644
--- a/.github/workflows/testAndPublish.yml
+++ b/.github/workflows/testAndPublish.yml
@@ -35,8 +35,8 @@ env:
   supportedRunners: '["windows-2022", "windows-2025-vs2026"]'
   defaultArch: x64
   supportedArchitectures: '["x64"]'
-  defaultPythonVersion: '3.13.13'
-  supportedPythonVersions: '["3.13.13"]'
+  defaultPythonVersion: '3.13.15'
+  supportedPythonVersions: '["3.13.15"]'
 
 jobs:
   matrix:
diff --git a/.python-versions b/.python-versions
index c799318b8e1..05c2197512e 100644
--- a/.python-versions
+++ b/.python-versions
@@ -1 +1 @@
-cpython-3.13.13-windows-x86_64-none
+cpython-3.13.15-windows-x86_64-none
diff --git a/projectDocs/dev/createDevEnvironment.md b/projectDocs/dev/createDevEnvironment.md
index 1495e7204f4..8a2d4ca5403 100644
--- a/projectDocs/dev/createDevEnvironment.md
+++ b/projectDocs/dev/createDevEnvironment.md
@@ -49,7 +49,7 @@ The following dependencies need to be installed on your system:
 
 #### Python
 
-[Python](https://www.python.org/), version 3.13.13, 64-bit.
+[Python](https://www.python.org/), version 3.13.15, 64-bit.
 Install the python version listed in [.python-versions](../../.python-versions)
 
 #### uv
diff --git a/runtime-builders/synthDriverHost32/.python-version b/runtime-builders/synthDriverHost32/.python-version
index fe6f212a493..1f155dedb47 100644
--- a/runtime-builders/synthDriverHost32/.python-version
+++ b/runtime-builders/synthDriverHost32/.python-version
@@ -1 +1 @@
-cpython-3.13.13-windows-x86-none
+cpython-3.13.15-windows-x86-none
diff --git a/user_docs/en/changes.md b/user_docs/en/changes.md
index 7432953d116..599ad0affdf 100644
--- a/user_docs/en/changes.md
+++ b/user_docs/en/changes.md
@@ -128,6 +128,7 @@ The default implementation forwards to `interactWithMathMl`, preserving compatib
 Built on top of [Bleak](https://bleak.readthedocs.io/) and the `_asyncioEventLoop` module. (#19838, @bramd)
 * Component updates:
   * Updated py2exe to 0.14.1.1. (#20260, @LeonarddeR)
+  * Python to 3.13.15. (#20634, @dpy013)
 * Handlers registered on an `extensionPoints` registrar (`Action`, `Filter`, `Decider`, `AccumulatingDecider`, `Chain`) may now register or unregister handlers while being called, without raising `RuntimeError: OrderedDict mutated during iteration`. (#20545, @LeonarddeR)
   * `HandlerRegistrar.handlers` now iterates over a snapshot of the registered handlers taken before the first handler is yielded.
 * Fixed a handle leak in `hwIo.Bulk.__init__`: if the read pipe opened successfully but the write pipe failed to open, the read handle was never closed, leaving the device open for the remaining lifetime of the process. (#20555, @KihunJang1981)