diff --git a/build_macOS.sh b/build_macOS.sh
index e65ac92..2910893 100755
--- a/build_macOS.sh
+++ b/build_macOS.sh
@@ -9,12 +9,14 @@ VERBOSE=false
 MAKE_DISK=false
 KEEP_VENV=false
 SETUP_ENVIRONMENT=false
-while getopts "hvde" OPTION; do
+PYINSTALLER=false
+while getopts "hvdesp" OPTION; do
 	case "$OPTION" in
 		h)  echo "Options:"
 			echo "\t-h Print help (this)"
 			echo "\t-v Verbose output"
 			echo "\t-e Keep Python virtual environment (don't delete)"
+			echo "\t-p Use PyInstaller to build instead of py2app"
 			echo "\t-s Setup dev environment"
 			echo "\t-d Make disk image (.dmg)"
 			exit 0
@@ -25,6 +27,8 @@ while getopts "hvde" OPTION; do
 			;;
 		e)  KEEP_VENV=true
 			;;
+		p)  PYINSTALLER=true
+			;;
 		s)  SETUP_ENVIRONMENT=true
 			;;
 		*)  echo "Incorrect option provided"
@@ -37,7 +41,7 @@ done
 if [ "$SETUP_ENVIRONMENT" = true ]
 then
 	# Install HomeBrew (only if you don't have it)
-	#/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+	/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 
 	# Install Dependencies
 	brew cask install xquartz
@@ -72,28 +76,31 @@ then
 	PIP=$(command -v pip)
 fi
 
-# Precheck for 'restricted' permissions on system Python. See below
-# Build will fail if using the system Python and it's restricted
-if [ "$(which ${PYTHON})" == "/usr/bin/python" ]
+if [ "$PYINSTALLER" = false ]
 then
-	if ls -dlO /System/Library/Frameworks/Python.framework | grep 'restricted'> /dev/null
+	# Precheck for 'restricted' permissions on system Python. See below
+	# Build will fail if using the system Python and it's restricted
+	if [ "$(which ${PYTHON})" == "/usr/bin/python" ]
 	then
-		echo -e "\033[1;31m"
-		echo "  *** *** *** *** *** *** *** *** *** *** *** *** ***"
-		echo ""
-		echo "  ️You are using the macOS system Python"
-		echo "  and it has the 'restricted' flag set."
-		echo ""
-		echo "  This causes application packaging to fail."
-		echo "  Please read README.md for details on how to "
-		echo "  resolve this problem."
-		echo ""
-		echo "  A better choice is to use a 'homebrew' installed"
-		echo "  Python. Please see the README.md for more info."
-		echo ""
-		echo "  *** *** *** *** *** *** *** *** *** *** *** *** ***"
-		echo -e "\033[0m"
-		exit 1
+		if ls -dlO /System/Library/Frameworks/Python.framework | grep 'restricted'> /dev/null
+		then
+			echo -e "\033[1;31m"
+			echo "  *** *** *** *** *** *** *** *** *** *** *** *** ***"
+			echo ""
+			echo "  ️You are using the macOS system Python"
+			echo "  and it has the 'restricted' flag set."
+			echo ""
+			echo "  This causes application packaging to fail."
+			echo "  Please read README.md for details on how to "
+			echo "  resolve this problem."
+			echo ""
+			echo "  A better choice is to use a 'homebrew' installed"
+			echo "  Python. Please see the README.md for more info."
+			echo ""
+			echo "  *** *** *** *** *** *** *** *** *** *** *** *** ***"
+			echo -e "\033[0m"
+			exit 1
+		fi
 	fi
 fi
 
@@ -119,7 +126,13 @@ echo "Install Dependencies..."
 ${PIP} install -r requirements.txt
 
 echo "Build macOS Application Bundle..."
-${PYTHON} py2app_setup.py py2app --packages=PIL
+if [ "$PYINSTALLER" = true ]
+then
+	${PYTHON} -OO -m PyInstaller -y --clean k40_whisperer.spec
+	rm -rf dist/k40_whisperer
+else
+	${PYTHON} py2app_setup.py py2app --packages=PIL
+fi
 
 echo "Copy support files to dist..."
 cp k40_whisperer_test.svg Change_Log.txt gpl-3.0.txt README_MacOS.md dist
@@ -140,8 +153,16 @@ fi
 if [ "$MAKE_DISK" = true ]
 then
 	echo "Build macOS Disk Image..."
-	rm ./K40-Whisperer-${VERSION}.dmg
-	hdiutil create -fs HFS+ -volname K40-Whisperer-${VERSION} -srcfolder ./dist ./K40-Whisperer-${VERSION}.dmg
+
+	if [ "$PYINSTALLER" = true ]
+	then
+		VOLNAME=K40-Whisperer-${VERSION}-pyinstaller
+	else 
+		VOLNAME=K40-Whisperer-${VERSION}
+	fi
+
+	rm ${VOLNAME}.dmg
+	hdiutil create -fs HFS+ -volname ${VOLNAME} -srcfolder ./dist ./K40-Whisperer-${VERSION}.dmg
 fi
 
 echo "Done."
\ No newline at end of file
diff --git a/k40_whisperer.spec b/k40_whisperer.spec
new file mode 100644
index 0000000..c778498
--- /dev/null
+++ b/k40_whisperer.spec
@@ -0,0 +1,49 @@
+# -*- mode: python -*-
+#
+# pyinstaller -y --clean k40_whisperer.spec
+# python -OO -m PyInstaller -y --clean k40_whisperer.spec
+#
+
+block_cipher = None
+
+a = Analysis(['k40_whisperer.py'],
+             pathex=['/Users/houser/Projects/K40_Whisperer'],
+             binaries=[],
+             datas=[],
+             hiddenimports=[],
+             hookspath=[],
+             runtime_hooks=[],
+             excludes=[],
+             win_no_prefer_redirects=False,
+             win_private_assemblies=False,
+             cipher=block_cipher,
+             noarchive=False)
+pyz = PYZ(a.pure, a.zipped_data,
+             cipher=block_cipher)
+exe = EXE(pyz,
+          a.scripts,
+          a.binaries,
+          a.zipfiles,
+          a.datas,
+          [],
+          name='k40_whisperer',
+          debug=False,
+          bootloader_ignore_signals=False,
+          strip=False,
+          upx=True,
+          runtime_tmpdir=None,
+          console=False
+		)
+app = BUNDLE(exe,
+            name='K40 Whisperer.app',
+            icon='emblem.icns',
+            bundle_identifier=None,
+			info_plist={
+				'NSPrincipleClass': 'NSApplication',
+				'NSAppleScriptEnabled': False,
+				'CFBundleIdentifier': 'com.scorchworks.k40_whisperer',
+				'CFBundleName': 'K40 Whisperer',
+				'CFBundleDisplayName': 'K40 Whisperer',
+				'CFBundleShortVersionString': '0.32'
+				}
+			)
diff --git a/requirements.txt b/requirements.txt
index 2a9bb95..aafe629 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 lxml
 pyusb
 pillow
+pyinstaller
\ No newline at end of file
diff --git a/update_macOS.sh b/update_macOS.sh
index efa684b..f8d1b7e 100755
--- a/update_macOS.sh
+++ b/update_macOS.sh
@@ -128,7 +128,7 @@ sips -s format icns emblem --out emblem.icns
 
 # Build macOS application
 echo "Build macOS Application..."
-./build_macOS.sh || exit
+./build_macOS.sh -d || exit
 
 # Make new patch file
 echo "Update macOS.patch file..."
@@ -138,11 +138,6 @@ do
     diff -Naur $UPDATE_DIR/$i $i >> macOS-${VERSION}.patch
 done
 
-# Make macOS Disk Image (.dmg) for distribution
-echo "Build macOS Disk Image..."
-rm ./K40-Whisperer-${VERSION}.dmg
-hdiutil create -fs HFS+ -volname K40-Whisperer-${VERSION} -srcfolder ./dist ./K40-Whisperer-${VERSION}.dmg
-
 if [ ! -z ${CLEAN_SOURCE+x} ]
 then
 	echo "🧹 Cleaning up downloaded source files..."