From ea084c9d01e585f7c0d099ca14261b007fc90fb6 Mon Sep 17 00:00:00 2001
From: Feodor Fitsner <feodor@appveyor.com>
Date: Mon, 20 Jul 2026 11:40:06 -0700
Subject: [PATCH 1/2] Bump to 4.3.5: Windows UTF-8 startup fix (dart_bridge
 1.5.1, python-build 20260720)

Re-pin the bundled python-build snapshot to 20260720, which bumps dart_bridge
1.5.0 -> 1.5.1. 1.5.1 fixes Windows startup when app paths or environment
values contain non-ASCII characters: Dart FFI strings (UTF-8) are now converted
to UTF-16 before hitting the Windows CRT (_wputenv_s / _wfopen_s), Python UTF-8
mode is enabled before Py_Initialize(), and embedded env-setup failures are
fatal. Closes flet-dev/flet#6641.

Windows-only change; iOS/macOS/Android/Linux runtimes are functionally
unchanged from 20260719. Python versions (3.12.13 / 3.13.14 / 3.14.6) unchanged.
---
 src/serious_python/CHANGELOG.md                             | 5 +++++
 src/serious_python/lib/src/python_versions.dart             | 6 +++---
 src/serious_python/pubspec.yaml                             | 2 +-
 src/serious_python_android/CHANGELOG.md                     | 4 ++++
 src/serious_python_android/android/build.gradle.kts         | 2 +-
 .../android/python_versions.properties                      | 6 +++---
 src/serious_python_android/pubspec.yaml                     | 2 +-
 src/serious_python_darwin/CHANGELOG.md                      | 4 ++++
 src/serious_python_darwin/darwin/python_versions.properties | 6 +++---
 .../darwin/serious_python_darwin.podspec                    | 2 +-
 src/serious_python_darwin/pubspec.yaml                      | 2 +-
 src/serious_python_linux/CHANGELOG.md                       | 4 ++++
 src/serious_python_linux/linux/python_versions.properties   | 6 +++---
 src/serious_python_linux/pubspec.yaml                       | 2 +-
 src/serious_python_platform_interface/CHANGELOG.md          | 4 ++++
 src/serious_python_platform_interface/pubspec.yaml          | 2 +-
 src/serious_python_windows/CHANGELOG.md                     | 4 ++++
 src/serious_python_windows/pubspec.yaml                     | 2 +-
 .../windows/python_versions.properties                      | 6 +++---
 19 files changed, 48 insertions(+), 23 deletions(-)

diff --git a/src/serious_python/CHANGELOG.md b/src/serious_python/CHANGELOG.md
index 0dbf2fa6..da4dd5e4 100644
--- a/src/serious_python/CHANGELOG.md
+++ b/src/serious_python/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 4.3.5
+
+* **Windows:** fix startup with non-ASCII app paths or environment values — Dart FFI strings (UTF-8) are now converted to UTF-16 before being passed to the Windows CRT, so paths/env values are no longer corrupted through the process ANSI code page, and Python UTF-8 mode is enabled before `Py_Initialize()`. See `serious_python_windows` 4.3.5 and flet-dev/flet#6641.
+* Bundled python-build snapshot re-pinned to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**, which carries the Windows fix above). Python versions (**3.12.13 / 3.13.14 / 3.14.6**) are unchanged.
+
 ## 4.3.4
 
 * **Windows/Linux:** desktop apps on Python **3.14** no longer crash at startup with `ModuleNotFoundError: No module named '_pyrepl'` when the app (or a dependency, e.g. NLTK) imports `pydoc` or `pdb`. `_pyrepl` was pruned from the desktop stdlib as a dev-only module, but 3.14's `pydoc`/`pdb` import it at module load. See `serious_python_windows` / `serious_python_linux` 4.3.4 and flet-dev/serious-python#236.
diff --git a/src/serious_python/lib/src/python_versions.dart b/src/serious_python/lib/src/python_versions.dart
index 2134cd39..e35cce2e 100644
--- a/src/serious_python/lib/src/python_versions.dart
+++ b/src/serious_python/lib/src/python_versions.dart
@@ -1,5 +1,5 @@
 // GENERATED by `dart run serious_python:gen_version_tables` from python-build's
-// manifest.json (release 20260719). Do not edit by hand — edit python-build's
+// manifest.json (release 20260720). Do not edit by hand — edit python-build's
 // manifest.json, cut a release, bump `pythonReleaseDate`, and regenerate.
 
 const pythonVersionEnvironmentVariable = "SERIOUS_PYTHON_VERSION";
@@ -10,8 +10,8 @@ const pyodideVersionEnvironmentVariable = "SERIOUS_PYTHON_PYODIDE_VERSION";
 const dartBridgeVersionEnvironmentVariable = "DART_BRIDGE_VERSION";
 
 /// python-build release the bundled runtimes come from (YYYYMMDD).
-const pythonReleaseDate = "20260719";
-const dartBridgeVersion = "1.5.0";
+const pythonReleaseDate = "20260720";
+const dartBridgeVersion = "1.5.1";
 const defaultPythonVersion = "3.14";
 
 class PythonRelease {
diff --git a/src/serious_python/pubspec.yaml b/src/serious_python/pubspec.yaml
index 43f73b2b..24a70726 100644
--- a/src/serious_python/pubspec.yaml
+++ b/src/serious_python/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python
 description: A cross-platform plugin for adding embedded Python runtime to your Flutter apps.
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.4
+version: 4.3.5
 
 platforms:
   ios:
diff --git a/src/serious_python_android/CHANGELOG.md b/src/serious_python_android/CHANGELOG.md
index eb01fdc8..143843f0 100644
--- a/src/serious_python_android/CHANGELOG.md
+++ b/src/serious_python_android/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.3.5
+
+* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.5); the Android runtime is functionally unchanged from 20260719.
+
 ## 4.3.4
 
 * Re-pins the bundled python-build snapshot to **20260719** (previously 20260714). The snapshot un-prunes `_pyrepl` on Windows/Linux desktop only; Android already shipped `_pyrepl` (un-pruned in 4.3.2), so these runtimes are byte-identical to 20260714.
diff --git a/src/serious_python_android/android/build.gradle.kts b/src/serious_python_android/android/build.gradle.kts
index 87cd9e0b..ba78b4c9 100644
--- a/src/serious_python_android/android/build.gradle.kts
+++ b/src/serious_python_android/android/build.gradle.kts
@@ -21,7 +21,7 @@ buildscript {
 }
 
 group = "com.flet.serious_python_android"
-version = "4.3.4"
+version = "4.3.5"
 
 rootProject.allprojects {
     repositories {
diff --git a/src/serious_python_android/android/python_versions.properties b/src/serious_python_android/android/python_versions.properties
index cb87dad8..1816c017 100644
--- a/src/serious_python_android/android/python_versions.properties
+++ b/src/serious_python_android/android/python_versions.properties
@@ -1,8 +1,8 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
-# python-build manifest.json (release 20260719). Do not edit by hand.
+# python-build manifest.json (release 20260720). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.5.0
-python_build_release_date=20260719
+dart_bridge_version=1.5.1
+python_build_release_date=20260720
 3.12.full_version=3.12.13
 3.12.android_abis=arm64-v8a,x86_64,armeabi-v7a
 3.13.full_version=3.13.14
diff --git a/src/serious_python_android/pubspec.yaml b/src/serious_python_android/pubspec.yaml
index c005bd8c..05ec0843 100644
--- a/src/serious_python_android/pubspec.yaml
+++ b/src/serious_python_android/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_android
 description: Android implementation of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.4
+version: 4.3.5
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
diff --git a/src/serious_python_darwin/CHANGELOG.md b/src/serious_python_darwin/CHANGELOG.md
index bc89dc3c..52eb5024 100644
--- a/src/serious_python_darwin/CHANGELOG.md
+++ b/src/serious_python_darwin/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.3.5
+
+* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.5); the iOS/macOS runtimes are functionally unchanged from 20260719.
+
 ## 4.3.4
 
 * Re-pins the bundled python-build snapshot to **20260719** (previously 20260714). The snapshot un-prunes `_pyrepl` on Windows/Linux desktop (fixing a 3.14 `pydoc`/`pdb` crash — see `serious_python_windows` / `serious_python_linux` 4.3.4); iOS/macOS already shipped `_pyrepl` (un-pruned in 4.3.2), so these runtimes are byte-identical to 20260714. No iOS/macOS-affecting changes.
diff --git a/src/serious_python_darwin/darwin/python_versions.properties b/src/serious_python_darwin/darwin/python_versions.properties
index cb87dad8..1816c017 100644
--- a/src/serious_python_darwin/darwin/python_versions.properties
+++ b/src/serious_python_darwin/darwin/python_versions.properties
@@ -1,8 +1,8 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
-# python-build manifest.json (release 20260719). Do not edit by hand.
+# python-build manifest.json (release 20260720). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.5.0
-python_build_release_date=20260719
+dart_bridge_version=1.5.1
+python_build_release_date=20260720
 3.12.full_version=3.12.13
 3.12.android_abis=arm64-v8a,x86_64,armeabi-v7a
 3.13.full_version=3.13.14
diff --git a/src/serious_python_darwin/darwin/serious_python_darwin.podspec b/src/serious_python_darwin/darwin/serious_python_darwin.podspec
index fe12a784..189e1581 100644
--- a/src/serious_python_darwin/darwin/serious_python_darwin.podspec
+++ b/src/serious_python_darwin/darwin/serious_python_darwin.podspec
@@ -4,7 +4,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'serious_python_darwin'
-  s.version          = '4.3.4'
+  s.version          = '4.3.5'
   s.summary          = 'A cross-platform plugin for adding embedded Python runtime to your Flutter apps.'
   s.description      = <<-DESC
   A cross-platform plugin for adding embedded Python runtime to your Flutter apps.
diff --git a/src/serious_python_darwin/pubspec.yaml b/src/serious_python_darwin/pubspec.yaml
index 0403199d..9930a925 100644
--- a/src/serious_python_darwin/pubspec.yaml
+++ b/src/serious_python_darwin/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_darwin
 description: iOS and macOS implementations of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.4
+version: 4.3.5
 
 environment:
   # The Swift Package Manager build path needs Flutter 3.44 / Dart 3.11 (the
diff --git a/src/serious_python_linux/CHANGELOG.md b/src/serious_python_linux/CHANGELOG.md
index 9b52543a..18e0c83f 100644
--- a/src/serious_python_linux/CHANGELOG.md
+++ b/src/serious_python_linux/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.3.5
+
+* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.5); the Linux runtime is functionally unchanged from 20260719.
+
 ## 4.3.4
 
 * **Fix `ModuleNotFoundError: No module named '_pyrepl'` on Python 3.14.** `_pyrepl` was pruned from the bundled Linux stdlib as a dev-only / interactive-REPL module, but CPython 3.14's `pydoc` (and `pdb`) import it at module load — so any app importing `pydoc`/`pdb`/`pytest`, or a dependency that does (e.g. NLTK → `pydoc`), crashed at startup. `_pyrepl` is no longer pruned. Re-pins the bundled python-build snapshot to **20260719** (previously 20260714). ([flet-dev/serious-python#236](https://github.com/flet-dev/serious-python/issues/236))
diff --git a/src/serious_python_linux/linux/python_versions.properties b/src/serious_python_linux/linux/python_versions.properties
index cb87dad8..1816c017 100644
--- a/src/serious_python_linux/linux/python_versions.properties
+++ b/src/serious_python_linux/linux/python_versions.properties
@@ -1,8 +1,8 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
-# python-build manifest.json (release 20260719). Do not edit by hand.
+# python-build manifest.json (release 20260720). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.5.0
-python_build_release_date=20260719
+dart_bridge_version=1.5.1
+python_build_release_date=20260720
 3.12.full_version=3.12.13
 3.12.android_abis=arm64-v8a,x86_64,armeabi-v7a
 3.13.full_version=3.13.14
diff --git a/src/serious_python_linux/pubspec.yaml b/src/serious_python_linux/pubspec.yaml
index 550ea754..08d9e4ee 100644
--- a/src/serious_python_linux/pubspec.yaml
+++ b/src/serious_python_linux/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_linux
 description: Linux implementations of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.4
+version: 4.3.5
 
 environment:
   sdk: '>=3.1.3 <4.0.0'
diff --git a/src/serious_python_platform_interface/CHANGELOG.md b/src/serious_python_platform_interface/CHANGELOG.md
index 6d3ccec6..d28ca774 100644
--- a/src/serious_python_platform_interface/CHANGELOG.md
+++ b/src/serious_python_platform_interface/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.3.5
+
+* Version bump aligning with the `serious_python_*` 4.3.5 release (Windows UTF-8 startup fix via `dart_bridge` 1.5.1). No interface changes.
+
 ## 4.3.4
 
 * Version bump aligning with the `serious_python_*` 4.3.4 release (desktop `_pyrepl` fix + Android `flet debug` cache fix). No interface changes.
diff --git a/src/serious_python_platform_interface/pubspec.yaml b/src/serious_python_platform_interface/pubspec.yaml
index 034d28cd..d23da379 100644
--- a/src/serious_python_platform_interface/pubspec.yaml
+++ b/src/serious_python_platform_interface/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_platform_interface
 description: A common platform interface for the serious_python plugin.
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.4
+version: 4.3.5
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
diff --git a/src/serious_python_windows/CHANGELOG.md b/src/serious_python_windows/CHANGELOG.md
index 59929cc4..44e60d15 100644
--- a/src/serious_python_windows/CHANGELOG.md
+++ b/src/serious_python_windows/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.3.5
+
+* **Fix Windows startup when app paths or environment values contain non-ASCII characters.** Dart FFI strings arrive as UTF-8, but the Windows boundary passed them straight to the ANSI CRT (`_putenv_s`, `fopen`), corrupting paths/env values through the process code page. The runtime now converts UTF-8 → UTF-16 and uses the wide CRT APIs (`_wputenv_s`, `_wfopen_s`), enables Python UTF-8 mode before `Py_Initialize()`, sets `PYTHONUTF8=1` for multiprocessing helpers, and treats embedded env-setup failures as fatal. Delivered via `dart_bridge` **1.5.1** (bundled python-build snapshot re-pinned to **20260720**). ([flet-dev/flet#6641](https://github.com/flet-dev/flet/issues/6641))
+
 ## 4.3.4
 
 * **Fix `ModuleNotFoundError: No module named '_pyrepl'` on Python 3.14.** `_pyrepl` was pruned from the bundled Windows stdlib as a dev-only / interactive-REPL module, but CPython 3.14's `pydoc` (and `pdb`) import it at module load — so any app importing `pydoc`/`pdb`/`pytest`, or a dependency that does (e.g. NLTK → `pydoc`), crashed at startup. `_pyrepl` is no longer pruned. Re-pins the bundled python-build snapshot to **20260719** (previously 20260714). ([flet-dev/serious-python#236](https://github.com/flet-dev/serious-python/issues/236))
diff --git a/src/serious_python_windows/pubspec.yaml b/src/serious_python_windows/pubspec.yaml
index fbde4e77..0b31df2a 100644
--- a/src/serious_python_windows/pubspec.yaml
+++ b/src/serious_python_windows/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_windows
 description: Windows implementations of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.4
+version: 4.3.5
 
 environment:
   sdk: '>=3.1.3 <4.0.0'
diff --git a/src/serious_python_windows/windows/python_versions.properties b/src/serious_python_windows/windows/python_versions.properties
index cb87dad8..1816c017 100644
--- a/src/serious_python_windows/windows/python_versions.properties
+++ b/src/serious_python_windows/windows/python_versions.properties
@@ -1,8 +1,8 @@
 # GENERATED by `dart run serious_python:gen_version_tables` from
-# python-build manifest.json (release 20260719). Do not edit by hand.
+# python-build manifest.json (release 20260720). Do not edit by hand.
 default_python_version=3.14
-dart_bridge_version=1.5.0
-python_build_release_date=20260719
+dart_bridge_version=1.5.1
+python_build_release_date=20260720
 3.12.full_version=3.12.13
 3.12.android_abis=arm64-v8a,x86_64,armeabi-v7a
 3.13.full_version=3.13.14

From 130f1b21bc3733c06acbcd57f8783678564d5721 Mon Sep 17 00:00:00 2001
From: Feodor Fitsner <feodor@appveyor.com>
Date: Mon, 20 Jul 2026 12:49:39 -0700
Subject: [PATCH 2/2] Retarget release 4.3.5 -> 4.3.6 (4.3.5 was accidentally
 published and pulled)

4.3.5 was published to pub.dev by mistake before this PR merged and has been
retracted, so the version number is burned. Bump all packages and CHANGELOG
sections to 4.3.6. Content is identical: python-build 20260720 / dart_bridge
1.5.1 Windows UTF-8 startup fix (flet #6641).
---
 src/serious_python/CHANGELOG.md                               | 4 ++--
 src/serious_python/pubspec.yaml                               | 2 +-
 src/serious_python_android/CHANGELOG.md                       | 4 ++--
 src/serious_python_android/android/build.gradle.kts           | 2 +-
 src/serious_python_android/pubspec.yaml                       | 2 +-
 src/serious_python_darwin/CHANGELOG.md                        | 4 ++--
 .../darwin/serious_python_darwin.podspec                      | 2 +-
 src/serious_python_darwin/pubspec.yaml                        | 2 +-
 src/serious_python_linux/CHANGELOG.md                         | 4 ++--
 src/serious_python_linux/pubspec.yaml                         | 2 +-
 src/serious_python_platform_interface/CHANGELOG.md            | 4 ++--
 src/serious_python_platform_interface/pubspec.yaml            | 2 +-
 src/serious_python_windows/CHANGELOG.md                       | 2 +-
 src/serious_python_windows/pubspec.yaml                       | 2 +-
 14 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/src/serious_python/CHANGELOG.md b/src/serious_python/CHANGELOG.md
index da4dd5e4..3d282b5c 100644
--- a/src/serious_python/CHANGELOG.md
+++ b/src/serious_python/CHANGELOG.md
@@ -1,6 +1,6 @@
-## 4.3.5
+## 4.3.6
 
-* **Windows:** fix startup with non-ASCII app paths or environment values — Dart FFI strings (UTF-8) are now converted to UTF-16 before being passed to the Windows CRT, so paths/env values are no longer corrupted through the process ANSI code page, and Python UTF-8 mode is enabled before `Py_Initialize()`. See `serious_python_windows` 4.3.5 and flet-dev/flet#6641.
+* **Windows:** fix startup with non-ASCII app paths or environment values — Dart FFI strings (UTF-8) are now converted to UTF-16 before being passed to the Windows CRT, so paths/env values are no longer corrupted through the process ANSI code page, and Python UTF-8 mode is enabled before `Py_Initialize()`. See `serious_python_windows` 4.3.6 and flet-dev/flet#6641.
 * Bundled python-build snapshot re-pinned to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**, which carries the Windows fix above). Python versions (**3.12.13 / 3.13.14 / 3.14.6**) are unchanged.
 
 ## 4.3.4
diff --git a/src/serious_python/pubspec.yaml b/src/serious_python/pubspec.yaml
index 24a70726..572ca8d8 100644
--- a/src/serious_python/pubspec.yaml
+++ b/src/serious_python/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python
 description: A cross-platform plugin for adding embedded Python runtime to your Flutter apps.
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.5
+version: 4.3.6
 
 platforms:
   ios:
diff --git a/src/serious_python_android/CHANGELOG.md b/src/serious_python_android/CHANGELOG.md
index 143843f0..ec4c989f 100644
--- a/src/serious_python_android/CHANGELOG.md
+++ b/src/serious_python_android/CHANGELOG.md
@@ -1,6 +1,6 @@
-## 4.3.5
+## 4.3.6
 
-* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.5); the Android runtime is functionally unchanged from 20260719.
+* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.6); the Android runtime is functionally unchanged from 20260719.
 
 ## 4.3.4
 
diff --git a/src/serious_python_android/android/build.gradle.kts b/src/serious_python_android/android/build.gradle.kts
index ba78b4c9..8f14855e 100644
--- a/src/serious_python_android/android/build.gradle.kts
+++ b/src/serious_python_android/android/build.gradle.kts
@@ -21,7 +21,7 @@ buildscript {
 }
 
 group = "com.flet.serious_python_android"
-version = "4.3.5"
+version = "4.3.6"
 
 rootProject.allprojects {
     repositories {
diff --git a/src/serious_python_android/pubspec.yaml b/src/serious_python_android/pubspec.yaml
index 05ec0843..ca194240 100644
--- a/src/serious_python_android/pubspec.yaml
+++ b/src/serious_python_android/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_android
 description: Android implementation of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.5
+version: 4.3.6
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
diff --git a/src/serious_python_darwin/CHANGELOG.md b/src/serious_python_darwin/CHANGELOG.md
index 52eb5024..c34af698 100644
--- a/src/serious_python_darwin/CHANGELOG.md
+++ b/src/serious_python_darwin/CHANGELOG.md
@@ -1,6 +1,6 @@
-## 4.3.5
+## 4.3.6
 
-* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.5); the iOS/macOS runtimes are functionally unchanged from 20260719.
+* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.6); the iOS/macOS runtimes are functionally unchanged from 20260719.
 
 ## 4.3.4
 
diff --git a/src/serious_python_darwin/darwin/serious_python_darwin.podspec b/src/serious_python_darwin/darwin/serious_python_darwin.podspec
index 189e1581..b7483634 100644
--- a/src/serious_python_darwin/darwin/serious_python_darwin.podspec
+++ b/src/serious_python_darwin/darwin/serious_python_darwin.podspec
@@ -4,7 +4,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'serious_python_darwin'
-  s.version          = '4.3.5'
+  s.version          = '4.3.6'
   s.summary          = 'A cross-platform plugin for adding embedded Python runtime to your Flutter apps.'
   s.description      = <<-DESC
   A cross-platform plugin for adding embedded Python runtime to your Flutter apps.
diff --git a/src/serious_python_darwin/pubspec.yaml b/src/serious_python_darwin/pubspec.yaml
index 9930a925..e7c7d4a8 100644
--- a/src/serious_python_darwin/pubspec.yaml
+++ b/src/serious_python_darwin/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_darwin
 description: iOS and macOS implementations of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.5
+version: 4.3.6
 
 environment:
   # The Swift Package Manager build path needs Flutter 3.44 / Dart 3.11 (the
diff --git a/src/serious_python_linux/CHANGELOG.md b/src/serious_python_linux/CHANGELOG.md
index 18e0c83f..a79a2877 100644
--- a/src/serious_python_linux/CHANGELOG.md
+++ b/src/serious_python_linux/CHANGELOG.md
@@ -1,6 +1,6 @@
-## 4.3.5
+## 4.3.6
 
-* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.5); the Linux runtime is functionally unchanged from 20260719.
+* Re-pins the bundled python-build snapshot to **20260720** (`dart_bridge` **1.5.0 → 1.5.1**). 1.5.1 is a Windows-only UTF-8 startup fix (see `serious_python_windows` 4.3.6); the Linux runtime is functionally unchanged from 20260719.
 
 ## 4.3.4
 
diff --git a/src/serious_python_linux/pubspec.yaml b/src/serious_python_linux/pubspec.yaml
index 08d9e4ee..e7545477 100644
--- a/src/serious_python_linux/pubspec.yaml
+++ b/src/serious_python_linux/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_linux
 description: Linux implementations of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.5
+version: 4.3.6
 
 environment:
   sdk: '>=3.1.3 <4.0.0'
diff --git a/src/serious_python_platform_interface/CHANGELOG.md b/src/serious_python_platform_interface/CHANGELOG.md
index d28ca774..4b5b560f 100644
--- a/src/serious_python_platform_interface/CHANGELOG.md
+++ b/src/serious_python_platform_interface/CHANGELOG.md
@@ -1,6 +1,6 @@
-## 4.3.5
+## 4.3.6
 
-* Version bump aligning with the `serious_python_*` 4.3.5 release (Windows UTF-8 startup fix via `dart_bridge` 1.5.1). No interface changes.
+* Version bump aligning with the `serious_python_*` 4.3.6 release (Windows UTF-8 startup fix via `dart_bridge` 1.5.1). No interface changes.
 
 ## 4.3.4
 
diff --git a/src/serious_python_platform_interface/pubspec.yaml b/src/serious_python_platform_interface/pubspec.yaml
index d23da379..22a7291a 100644
--- a/src/serious_python_platform_interface/pubspec.yaml
+++ b/src/serious_python_platform_interface/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_platform_interface
 description: A common platform interface for the serious_python plugin.
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.5
+version: 4.3.6
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
diff --git a/src/serious_python_windows/CHANGELOG.md b/src/serious_python_windows/CHANGELOG.md
index 44e60d15..156a29b2 100644
--- a/src/serious_python_windows/CHANGELOG.md
+++ b/src/serious_python_windows/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 4.3.5
+## 4.3.6
 
 * **Fix Windows startup when app paths or environment values contain non-ASCII characters.** Dart FFI strings arrive as UTF-8, but the Windows boundary passed them straight to the ANSI CRT (`_putenv_s`, `fopen`), corrupting paths/env values through the process code page. The runtime now converts UTF-8 → UTF-16 and uses the wide CRT APIs (`_wputenv_s`, `_wfopen_s`), enables Python UTF-8 mode before `Py_Initialize()`, sets `PYTHONUTF8=1` for multiprocessing helpers, and treats embedded env-setup failures as fatal. Delivered via `dart_bridge` **1.5.1** (bundled python-build snapshot re-pinned to **20260720**). ([flet-dev/flet#6641](https://github.com/flet-dev/flet/issues/6641))
 
diff --git a/src/serious_python_windows/pubspec.yaml b/src/serious_python_windows/pubspec.yaml
index 0b31df2a..8524b9f4 100644
--- a/src/serious_python_windows/pubspec.yaml
+++ b/src/serious_python_windows/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_windows
 description: Windows implementations of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 4.3.5
+version: 4.3.6
 
 environment:
   sdk: '>=3.1.3 <4.0.0'