diff --git a/backups/fetch-macOS.py b/backups/fetch-macOS.py
index 2a6f7f2..1cab437 100755
--- a/backups/fetch-macOS.py
+++ b/backups/fetch-macOS.py
@@ -70,13 +70,14 @@ catalogs = {
     "DeveloperSeed": "https://swscan.apple.com/content/catalogs/others/index-10.16seed-10.16-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog",
     "PublicSeed": "https://swscan.apple.com/content/catalogs/others/index-10.16beta-10.16-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog",
     "PublicRelease": "https://swscan.apple.com/content/catalogs/others/index-10.16-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog",
-    "20": "https://swscan.apple.com/content/catalogs/others/index-11-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog"
+    "20": "https://swscan.apple.com/content/catalogs/others/index-11-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog",
+    '21': "https://swscan.apple.com/content/catalogs/others/index-12-10.16-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog",
 }
 
 
 def get_default_catalog():
     '''Returns the default softwareupdate catalog for the current OS'''
-    return catalogs["20"]
+    return catalogs["21"]
     # return catalogs["PublicRelease"]
     # return catalogs["DeveloperSeed"]
 
@@ -101,9 +102,9 @@ def replicate_url(full_url,
 
     # hack
     print("[+] Fetching %s" % full_url)
-    if installer and "BaseSystem.dmg" not in full_url and "Big Sur" not in product_title:
+    if installer and "BaseSystem.dmg" not in full_url and "Big Sur" not in product_title and "Monterey" not in product_title:
         return
-    if "Big Sur" in product_title and "InstallAssistant.pkg" not in full_url:
+    if ("Big Sur" in product_title or "Monterey" in product_title) and "InstallAssistant.pkg" not in full_url:
         return
     attempt_resume = True
     # path = urllib.parse.urlsplit(full_url)[2]
diff --git a/scripts/bigsur/Makefile b/scripts/bigsur/Makefile
index 615b8f3..8e731e5 100644
--- a/scripts/bigsur/Makefile
+++ b/scripts/bigsur/Makefile
@@ -55,7 +55,7 @@ else
 endif
 
 BaseSystem.dmg :
-	../../fetch-macOS-v2.py --action download --board-id Mac-E43C1C25D4880AD6
+	../../fetch-macOS-v2.py --action download --board-id Mac-2BD1B31983FE1663
 
 InstallAssistant.pkg :
 	../../backups/fetch-macOS.py --version latest --title "macOS Big Sur"
diff --git a/scripts/monterey/Makefile b/scripts/monterey/Makefile
index de3d660..eb36bec 100644
--- a/scripts/monterey/Makefile
+++ b/scripts/monterey/Makefile
@@ -1,19 +1,63 @@
-# Builds a full installer (Monterey-full.img) for Monterey Developer Beta.
+# Builds either a recovery image (Monterey-recovery.img) or a full installer (Monterey-full.img) for Monterey.
 
-# You need to opt-in to the Developer beta program first and get the Monterey installer app using System Update
+# To build the full installer you must run this on macOS.
+# The recovery can be built on either macOS or Linux.
 
-MONTEREY_APP=/Applications/Install\ macOS\ 12\ Beta.app
+# For Ubuntu (or similar Linux distribution) you'll need to run this first to get the required packages:
+# sudo apt install qemu-utils make
 
-all: Monterey-full.img
+# For macOS you'll probably need to run xcode-select --install to get the commandline tools
+
+MONTEREY_APP=/Applications/Install\ macOS\ Monterey.app
+
+LINUX_TOOLS = qemu-img
+
+OS :=
+UNAME_S := $(shell uname -s)
+
+ifeq ($(UNAME_S),Darwin)
+	OS = MACOS
+endif
+
+# If this is Linux make sure we have all our build tools available:
+ifeq ($(OS),)
+	K := $(foreach exec,$(LINUX_TOOLS),\
+			$(if $(shell which $(exec)),some string,$(error "Missing required $(exec) tool for build")))
+endif
+
+all: Monterey-recovery.img
 
 %.img : %.dmg
 	ln $< $@ || cp $< $@
 
+ifeq ($(OS),MACOS)
 Monterey-full.dmg : $(MONTEREY_APP)
 	hdiutil create -o "$@" -size 14g -layout GPTSPUD -fs HFS+J
 	hdiutil attach -noverify -mountpoint /Volumes/install_build "$@"
 	sudo "$</Contents/Resources/createinstallmedia" --volume /Volumes/install_build --nointeraction
-	hdiutil detach "/Volumes/Install macOS 12 Beta"
+	hdiutil detach "/Volumes/Install macOS Monterey"
+else
+Monterey-full.dmg :
+	$(error "Building a full installer requires this script to be run on macOS, run 'make Monterey-recovery.img' instead")
+endif
+
+$(MONTEREY_APP) : InstallAssistant.pkg
+	sudo installer -pkg $< -target /
+
+Monterey-recovery.dmg : BaseSystem.dmg
+	rm -f $@
+ifeq ($(OS),MACOS)
+	hdiutil convert $< -format UDRW -o $@
+else
+	qemu-img convert $< -O raw $@
+endif
+
+BaseSystem.dmg :
+	../../fetch-macOS-v2.py --action download --board-id Mac-7BA5B2D9E42DDD94 --os latest
+
+InstallAssistant.pkg :
+	../../backups/fetch-macOS.py --version latest --title "macOS Monterey"
 
 clean :
-	rm -f Monterey-recovery.img Monterey-full.img
+	rm -f BaseSystem.chunklist BaseSystem.dmg SharedSupport.dmg InstallAssistant.pkg Monterey-recovery.img Monterey-full.img
+	rm -rf content