diff --git a/packaging/osx/OpenRA.app/Contents/MacOS/OpenRA b/packaging/osx/OpenRA.app/Contents/MacOS/OpenRA
index 7865887461..e4e9f43d40 100755
--- a/packaging/osx/OpenRA.app/Contents/MacOS/OpenRA
+++ b/packaging/osx/OpenRA.app/Contents/MacOS/OpenRA
@@ -27,6 +27,7 @@ CNC_MIXEN="http://open-ra.org/packages/cnc-packages.zip"
 APP_PATH=`echo $0 | awk '{split($0,patharr,"/"); idx=1; while(patharr[idx+3] != "") { if (patharr[idx] != "/") {printf("%s/", patharr[idx]); idx++ }} }'`
 EXE_PATH="$APP_PATH/Contents/MacOS/"
 PAYLOAD="$APP_PATH/Contents/Resources/payload.zip"
+VERSION=`cat "$APP_PATH/Contents/Resources/VERSION"`
 export LD_LIBRARY_PATH="$EXE_PATH/lib":$LD_LIBRARY_PATH
 export MONO_PATH="$EXE_PATH/lib"
 
@@ -100,6 +101,13 @@ if [ ! -e "$GAME_PATH/OpenRA.Game.exe" ]; then
 	fi
 fi
 
+# Is the installed version older than the current version?
+INSTVER=`cat "$GAME_PATH/VERSION"`
+if [ $INSTVER -lt $VERSION ]; then
+	echo "Updating installed version $INSTVER to $VERSION"
+	unzip -o "$PAYLOAD" -d "$GAME_PATH"
+fi
+
 # Prompt for the mod to run
 MODBUTTON=`osascript -e  'tell application "Finder"
 	display dialog "Choose a mod" buttons {"Red Alert", "C&C"} \
diff --git a/packaging/osx/package-game.sh b/packaging/osx/package-game.sh
index 92331c2dde..5a6f6c0f6e 100755
--- a/packaging/osx/package-game.sh
+++ b/packaging/osx/package-game.sh
@@ -25,13 +25,15 @@ cd $PAYLOAD
 for i in $EXCLUDE; do
 	find . -path "$i" -delete
 done
+date "+%Y%m%d%H" >> "VERSION"
 zip payload -r -9 *
-
 cd $PACKAGING_PATH
 
 # Move everything into the app bundle
 cp -r "$LAUNCHER_PATH" .
 cp  "$PAYLOAD/payload.zip" "OpenRA.app/Contents/Resources/"
+cp "$PAYLOAD/VERSION" "OpenRA.app/Contents/Resources/"
+
 rm -rf $PAYLOAD
 zip OpenRA -r -9 OpenRA.app 
 echo "Done!"
\ No newline at end of file