diff --git a/flutter/sherpa_onnx/pubspec.yaml b/flutter/sherpa_onnx/pubspec.yaml
index 4d960ce0b..7b23596e8 100644
--- a/flutter/sherpa_onnx/pubspec.yaml
+++ b/flutter/sherpa_onnx/pubspec.yaml
@@ -23,6 +23,7 @@ homepage: https://github.com/k2-fsa/sherpa-onnx
 
 environment:
   sdk: ">=3.2.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 dependencies:
   ffi: ^2.1.0
diff --git a/flutter/sherpa_onnx_android/pubspec.yaml b/flutter/sherpa_onnx_android/pubspec.yaml
index 7ff627b96..c515cda50 100644
--- a/flutter/sherpa_onnx_android/pubspec.yaml
+++ b/flutter/sherpa_onnx_android/pubspec.yaml
@@ -22,6 +22,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_android_arm64/pubspec.yaml b/flutter/sherpa_onnx_android_arm64/pubspec.yaml
index 68a863a44..c21c14b77 100644
--- a/flutter/sherpa_onnx_android_arm64/pubspec.yaml
+++ b/flutter/sherpa_onnx_android_arm64/pubspec.yaml
@@ -22,6 +22,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_android_armeabi/pubspec.yaml b/flutter/sherpa_onnx_android_armeabi/pubspec.yaml
index c670c8bd3..ea3b285b6 100644
--- a/flutter/sherpa_onnx_android_armeabi/pubspec.yaml
+++ b/flutter/sherpa_onnx_android_armeabi/pubspec.yaml
@@ -22,6 +22,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_android_x86/pubspec.yaml b/flutter/sherpa_onnx_android_x86/pubspec.yaml
index 5ba6d7a2f..1353e2375 100644
--- a/flutter/sherpa_onnx_android_x86/pubspec.yaml
+++ b/flutter/sherpa_onnx_android_x86/pubspec.yaml
@@ -22,6 +22,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_android_x86_64/pubspec.yaml b/flutter/sherpa_onnx_android_x86_64/pubspec.yaml
index f32ebf641..b7063c7db 100644
--- a/flutter/sherpa_onnx_android_x86_64/pubspec.yaml
+++ b/flutter/sherpa_onnx_android_x86_64/pubspec.yaml
@@ -22,6 +22,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_ios/pubspec.yaml b/flutter/sherpa_onnx_ios/pubspec.yaml
index b532f7ac9..ff7ef2f10 100644
--- a/flutter/sherpa_onnx_ios/pubspec.yaml
+++ b/flutter/sherpa_onnx_ios/pubspec.yaml
@@ -22,6 +22,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_linux/pubspec.yaml b/flutter/sherpa_onnx_linux/pubspec.yaml
index eff619104..83434570c 100644
--- a/flutter/sherpa_onnx_linux/pubspec.yaml
+++ b/flutter/sherpa_onnx_linux/pubspec.yaml
@@ -21,6 +21,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_macos/pubspec.yaml b/flutter/sherpa_onnx_macos/pubspec.yaml
index 4a84d287a..0e3bef3d2 100644
--- a/flutter/sherpa_onnx_macos/pubspec.yaml
+++ b/flutter/sherpa_onnx_macos/pubspec.yaml
@@ -22,6 +22,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_windows/pubspec.yaml b/flutter/sherpa_onnx_windows/pubspec.yaml
index a159cee60..aae47a8ae 100644
--- a/flutter/sherpa_onnx_windows/pubspec.yaml
+++ b/flutter/sherpa_onnx_windows/pubspec.yaml
@@ -22,6 +22,7 @@ topics:
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=2.8.1"
 
 flutter:
   plugin:
diff --git a/flutter/sherpa_onnx_windows/windows/.gitignore b/flutter/sherpa_onnx_windows/windows/.gitignore
index b3eb2be16..a0636e3e3 100644
--- a/flutter/sherpa_onnx_windows/windows/.gitignore
+++ b/flutter/sherpa_onnx_windows/windows/.gitignore
@@ -7,7 +7,6 @@ flutter/
 *.sln.docstates
 
 # Visual Studio build-related files.
-x64/
 x86/
 
 # Visual Studio cache files
diff --git a/scripts/wheel/patch_wheel.py b/scripts/wheel/patch_wheel.py
index 3dcf660c9..5b57f245b 100755
--- a/scripts/wheel/patch_wheel.py
+++ b/scripts/wheel/patch_wheel.py
@@ -46,6 +46,8 @@ def process(out_dir: Path, whl: Path):
         py_version = "3.13"
     elif "cp314" in str(whl):
         py_version = "3.14"
+    elif "cp315" in str(whl):
+        py_version = "3.15"
     elif "py3-none" in str(whl):
         py_version = None
     else: