diff --git a/build/scripts/build_windows.py b/build/scripts/build_windows.py
index aacf5c2..b406a4f 100644
--- a/build/scripts/build_windows.py
+++ b/build/scripts/build_windows.py
@@ -78,7 +78,12 @@ class WindowsBuilder:
         ]
 
         print(f"  Command: {' '.join(cmd)}")
-        result = subprocess.run(cmd, cwd=str(self.project_root))
+        result = subprocess.run(
+            cmd, 
+            cwd=str(self.project_root),
+            encoding="utf-8",
+            errors="replace"
+        )
 
         if result.returncode != 0:
             print("❌ PyInstaller build failed")
@@ -162,7 +167,11 @@ class WindowsBuilder:
         ]
 
         print(f"  Compiling WiX source...")
-        result = subprocess.run(candle_cmd)
+        result = subprocess.run(
+            candle_cmd,
+            encoding="utf-8",
+            errors="replace"
+        )
         if result.returncode != 0:
             print("❌ WiX compilation failed")
             return False
@@ -176,7 +185,11 @@ class WindowsBuilder:
         ]
 
         print(f"  Linking MSI installer...")
-        result = subprocess.run(light_cmd)
+        result = subprocess.run(
+            light_cmd,
+            encoding="utf-8",
+            errors="replace"
+        )
         if result.returncode != 0:
             print("❌ MSI linking failed")
             return False
@@ -279,7 +292,11 @@ class WindowsBuilder:
             str(exe_path),
         ]
 
-        result = subprocess.run(cmd)
+        result = subprocess.run(
+            cmd,
+            encoding="utf-8",
+            errors="replace"
+        )
         if result.returncode != 0:
             print("❌ Code signing failed")
             return False
@@ -331,6 +348,7 @@ def sync_version() -> None:
         [sys.executable, str(script_path)],
         capture_output=True,
         text=True,
+        encoding="utf-8",
     )
     if result.returncode != 0:
         print(f"❌ Version sync failed: {result.stderr}")
diff --git a/scripts/sync_version.py b/scripts/sync_version.py
index 4ae018c..b128ede 100644
--- a/scripts/sync_version.py
+++ b/scripts/sync_version.py
@@ -21,6 +21,12 @@ import sys
 from datetime import datetime
 from pathlib import Path
 
+# Enable UTF-8 output on Windows
+if sys.platform == "win32":
+    import io
+    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding="utf-8")
+    sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding="utf-8")
+
 # Import shared version utilities
 sys.path.insert(0, str(Path(__file__).parent.parent / "build" / "scripts"))
 from version_utils import get_current_version, get_project_root