diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f9f53c1..8e2ce18 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -31,8 +31,11 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install pyinstaller pathspec pyperclip
-          if [ "${{ matrix.os }}" != "windows-latest" ]; then
+
+          if [ "${{ matrix.os }}" = "ubuntu-latest" ]; then
             sudo apt-get update && sudo apt-get install -y upx
+          elif [ "${{ matrix.os }}" = "macos-latest" ]; then
+            brew install upx
           fi
 
       # Build binary with PyInstaller and optimize
@@ -42,7 +45,16 @@ jobs:
           if [ "${{ matrix.os }}" = "windows-latest" ]; then
             pyinstaller --onefile --noconsole --name gptree.exe cli_tool_gptree/main.py
           else
-            pyinstaller --onefile --noconsole --upx-dir=/usr/bin --name gptree cli_tool_gptree/main.py
+            # Dynamically find UPX path
+            UPX_PATH=$(which upx || echo "")
+            echo "Using UPX path: $UPX_PATH"
+
+            if [ -n "$UPX_PATH" ]; then
+              pyinstaller --onefile --noconsole --upx-dir=$(dirname "$UPX_PATH") --name gptree cli_tool_gptree/main.py
+            else
+              echo "UPX not found; skipping compression."
+              pyinstaller --onefile --noconsole --name gptree cli_tool_gptree/main.py
+            fi
           fi
 
       # Rename binaries for platform-specific names