diff --git a/PRD.md b/PRD.md
index a98bd34..42f89f1 100644
--- a/PRD.md
+++ b/PRD.md
@@ -8,7 +8,7 @@
 - 隐私敏感用户：仅本地处理（除下载外），可控与可复现。
 
 ## 范围与约束（MVP）
-- 平台：macOS 26（Apple Silicon）。
+- 平台：macOS 14 Sonoma 或更高版本（Apple Silicon）。
 - 依赖：Homebrew 安装的 `yt-dlp`、`ffmpeg`、`yap`；仅检测缺失并提示，不代安装。
 - 识别：仅用 `yap` CLI（不写任何 native 代码，不用 macOS Speech）。
 - 字幕：仅 SRT；官方字幕优先且只接受英文（含 `en-auto`），其余语言一律忽略；保留官方 `captions.vtt` 与转出的 `subs_en.srt`。
diff --git a/README.md b/README.md
index b739eed..e00994d 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Before running TransCube, make sure you have these tools installed:
 
 #### Using Homebrew (macOS)
 
-Note: Requires macOS 26 or later.
+Note: Requires macOS 14 (Sonoma) or later.
 
 ```bash
 brew install --cask strrl/collective/transcube
diff --git a/build/darwin/Info.dev.plist b/build/darwin/Info.dev.plist
index c024742..67ea215 100644
--- a/build/darwin/Info.dev.plist
+++ b/build/darwin/Info.dev.plist
@@ -18,7 +18,7 @@
         <key>CFBundleIconFile</key>
         <string>iconfile</string>
         <key>LSMinimumSystemVersion</key>
-        <string>26.0</string>
+        <string>14.0</string>
         <key>NSHighResolutionCapable</key>
         <string>true</string>
         <key>NSHumanReadableCopyright</key>
diff --git a/build/darwin/Info.plist b/build/darwin/Info.plist
index b22c2fd..d410b22 100644
--- a/build/darwin/Info.plist
+++ b/build/darwin/Info.plist
@@ -18,7 +18,7 @@
         <key>CFBundleIconFile</key>
         <string>iconfile</string>
         <key>LSMinimumSystemVersion</key>
-        <string>26.0</string>
+        <string>14.0</string>
         <key>NSHighResolutionCapable</key>
         <string>true</string>
         <key>NSHumanReadableCopyright</key>
diff --git a/scripts/build.sh b/scripts/build.sh
index 5697c18..ebb3403 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -118,7 +118,7 @@ VERSION_MODIFIED=true
 echo "Building version $VERSION..."
 # Enforce minimum macOS version at link time when building on macOS
 if [[ "$OSTYPE" == "darwin"* ]]; then
-    export MACOSX_DEPLOYMENT_TARGET="26.0"
+    export MACOSX_DEPLOYMENT_TARGET="14.0"
 fi
 wails build -clean
 
diff --git a/scripts/sign-and-notarize.sh b/scripts/sign-and-notarize.sh
index 6e7343c..576a374 100755
--- a/scripts/sign-and-notarize.sh
+++ b/scripts/sign-and-notarize.sh
@@ -49,7 +49,7 @@ fi
 # Build app
 echo -e "${GREEN}📦 Building app...${NC}"
 # Enforce minimum macOS version at link time
-export MACOSX_DEPLOYMENT_TARGET="26.0"
+export MACOSX_DEPLOYMENT_TARGET="14.0"
 wails build -platform darwin/universal -clean
 
 APP_PATH="build/bin/transcube-webapp.app"