diff --git a/update.sh b/update.sh
index f416cbf90..3546cc3d1 100755
--- a/update.sh
+++ b/update.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-function wait4proxmark {
+function wait4proxmark_Linux {
 	echo >&2 "Waiting for Proxmark to appear..."
 	while [ ! -c /dev/ttyACM? -a ! -L /dev/pm3-? ]; do
 		sleep .1
@@ -10,5 +10,23 @@ function wait4proxmark {
 	echo $PM3
 }
 
-# flash bootroom & system image
-client/flasher $(wait4proxmark) -b bootrom/obj/bootrom.elf armsrc/obj/fullimage.elf 
+function wait4proxmark_macOS {
+	echo >&2 "Waiting for Proxmark to appear..."
+	while true; do
+		PM3=$(ls /dev/pm3-* /dev/cu.usbmodem* 2>/dev/null | head -1)
+		if [[ $PM3 != "" ]]; then
+			#echo >&2 -e "Found proxmark on $(ls /dev/pm3-* /dev/cu.usbmodem* 2>/dev/null | head -1)\n"
+			break
+		fi
+		sleep .1
+	done
+	echo $PM3
+}
+
+# Detect OS and flash bootroom & system image
+
+if [[ $(uname | awk '{print toupper($0)}') == "LINUX" ]]; then
+    client/flasher $(wait4proxmark_Linux) -b bootrom/obj/bootrom.elf armsrc/obj/fullimage.elf
+elif [[ $(uname | awk '{print toupper($0)}') == "DARWIN" ]]; then
+    client/flasher $(wait4proxmark_macOS) -b bootrom/obj/bootrom.elf armsrc/obj/fullimage.elf
+fi