diff --git a/README.md b/README.md
index 4a270b7..0f15c07 100644
--- a/README.md
+++ b/README.md
@@ -117,6 +117,3 @@ temporary build-related artifacts.
 
 * New Alpine Linux *versions* are currently not auto-detected and added as a
   core version profile; this process is, at the moment, still a manual task.
-
-* Although it's possible to build "aarch64" (arm64) AMIs, they don't quite work
-  yet.
diff --git a/profiles/alpine.conf b/profiles/alpine.conf
index fbb086d..0c55058 100644
--- a/profiles/alpine.conf
+++ b/profiles/alpine.conf
@@ -1,6 +1,7 @@
 ### Profile for Building the Publically-Available Alpine Linux AMIs
 # vim: ts=2 et:
 
+version-3_12  { include required("version/3.12") }
 version-3_11  { include required("version/3.11") }
 version-3_10  { include required("version/3.10") }
 version-3_9   { include required("version/3.9") }
@@ -15,15 +16,13 @@ alpine {
 
 # Build definitions
 BUILDS {
-  # merge version, arch, and profile vars
+  # merge version, arch, profile; add { revision = "r1" } if needed
+  v3_12-x86_64  = ${version-3_12} ${arch-x86_64} ${alpine}
   v3_11-x86_64  = ${version-3_11} ${arch-x86_64} ${alpine}
   v3_10-x86_64  = ${version-3_10} ${arch-x86_64} ${alpine}
   v3_9-x86_64   = ${version-3_9}  ${arch-x86_64} ${alpine}
-  edge-x86_64   = ${version-edge} ${arch-x86_64} ${alpine} {
-    revision = "@NOW@"
-  }
+  edge-x86_64   = ${version-edge} ${arch-x86_64} ${alpine}
 
-  edge-aarch64 = ${version-edge} ${arch-aarch64} ${alpine} {
-    revision = "@NOW@"
-  }
+  v3_12-aarch64 = ${version-3_12} ${arch-aarch64} ${alpine}
+  edge-aarch64  = ${version-edge} ${arch-aarch64} ${alpine}
 }
diff --git a/profiles/arch/aarch64-1 b/profiles/arch/aarch64-1
index 37564e5..f40af5a 100644
--- a/profiles/arch/aarch64-1
+++ b/profiles/arch/aarch64-1
@@ -6,5 +6,5 @@ build_arch          = "arm64"
 build_instance_type = "a1.medium"
 apk_tools           = "https://github.com/alpinelinux/apk-tools/releases/download/v2.10.3/apk-tools-2.10.3-aarch64-linux.tar.gz"
 apk_tools_sha256    = "58a07e547c83c3a30eb0a0bd73db57d6bbaf92cc093df7a1d9805631f7d349e3"
-alpine_keys         = "http://dl-cdn.alpinelinux.org/alpine/v3.9/main/aarch64/alpine-keys-2.1-r1.apk"
-alpine_keys_sha256  = "1ae4cebb43adee47a68aa891660e69a1ac6467690daca6f211aabff36a17cad1"
+alpine_keys         = "http://dl-cdn.alpinelinux.org/alpine/v3.12/main/aarch64/alpine-keys-2.2-r0.apk"
+alpine_keys_sha256  = "94f287d541a03017d37895e46dc43bb62ce2e66ee99bb96b8c3de5c6638d5953"
diff --git a/profiles/arch/x86_64-1 b/profiles/arch/x86_64-1
index 40b60dc..ce30a7b 100644
--- a/profiles/arch/x86_64-1
+++ b/profiles/arch/x86_64-1
@@ -3,7 +3,7 @@
 
 arch                = "x86_64"
 build_arch          = "x86_64"
-apk_tools           = "https://github.com/alpinelinux/apk-tools/releases/download/v2.10.3/apk-tools-2.10.3-x86_64-linux.tar.gz"
-apk_tools_sha256    = "4d0b2cda606720624589e6171c374ec6d138867e03576d9f518dddde85c33839"
-alpine_keys         = "http://dl-cdn.alpinelinux.org/alpine/v3.9/main/x86_64/alpine-keys-2.1-r1.apk"
-alpine_keys_sha256  = "9c7bc5d2e24c36982da7aa49b3cfcb8d13b20f7a03720f25625fa821225f5fbc"
+apk_tools           = "https://github.com/alpinelinux/apk-tools/releases/download/v2.10.4/apk-tools-2.10.4-x86_64-linux.tar.gz"
+apk_tools_sha256    = "efe948160317fe78058e207554d0d9195a3dfcc35f77df278d30448d7b3eb892"
+alpine_keys         = "http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/alpine-keys-2.2-r0.apk"
+alpine_keys_sha256  = "d75cfd3eb6c863779f4eccb55ab5b6c5a8e47e4538c717fae580d3c47c70574a"
diff --git a/profiles/test.conf b/profiles/test.conf
index 74019b1..dc86fd0 100644
--- a/profiles/test.conf
+++ b/profiles/test.conf
@@ -14,17 +14,22 @@ test {
   ami_name_prefix = "test-"
   ami_desc_prefix = "Alpine Test "
   ami_user        = "test"
+  setup_script    = scripts/test-setup_script.sh
+  setup_copy {
+    base    = profiles/base
+    aarch64 = profiles/arch/aarch64
+  }
 }
 
 # Build definitions
 BUILDS {
   # merge version, arch, profile, and build vars
-  v3_12-x86_64  = ${version-3_12} ${arch-x86_64} ${test} { revision = "r0" }
-  v3_11-x86_64  = ${version-3_11} ${arch-x86_64} ${test} { revision = "r0" }
-  v3_10-x86_64  = ${version-3_10} ${arch-x86_64} ${test} { revision = "r0" }
-  v3_9-x86_64   = ${version-3_9}  ${arch-x86_64} ${test} { revision = "r0" }
+  v3_12-x86_64  = ${version-3_12} ${arch-x86_64} ${test}
+  v3_11-x86_64  = ${version-3_11} ${arch-x86_64} ${test} { revision = "r1" }
+  v3_10-x86_64  = ${version-3_10} ${arch-x86_64} ${test} { revision = "r2" }
+  v3_9-x86_64   = ${version-3_9}  ${arch-x86_64} ${test} { revision = "r3" }
   edge-x86_64   = ${version-edge} ${arch-x86_64} ${test}
 
-  v3_12-aarch64 = ${version-3_12} ${arch-aarch64} ${test} { revision = "r0" }
+  v3_12-aarch64 = ${version-3_12} ${arch-aarch64} ${test}
   edge-aarch64  = ${version-edge} ${arch-aarch64} ${test}
 }
diff --git a/profiles/version/edge b/profiles/version/edge
index 07c583d..1bde7b5 100644
--- a/profiles/version/edge
+++ b/profiles/version/edge
@@ -7,8 +7,8 @@ include required("../base/current")
 # add edge-specific tweaks...
 version     = "edge"
 release     = "edge"
-end_of_life = "@TOMORROW@"
-revision    = "@NOW@"
+end_of_life = null      # defaults to tomorrow
+revision    = null      # defaults to datetime
 
 repos {
   "http://dl-cdn.alpinelinux.org/alpine/edge/main"      = true
diff --git a/scripts/builder.py b/scripts/builder.py
index 21df3fe..3f1d8f7 100755
--- a/scripts/builder.py
+++ b/scripts/builder.py
@@ -459,12 +459,24 @@ class ConfigBuilder:
         return datetime.fromisoformat(input).isoformat(timespec="seconds")
 
     @classmethod
-    def resolve_tomorrow(cls, input):
+    def resolve_now(cls):
+        return cls.now.strftime("%Y%m%d%H%M%S")
+
+    @classmethod
+    def resolve_revision(cls, input):
+        if input is None or input == "":
+            return cls.resolve_now()
+        return input
+
+    @classmethod
+    def resolve_tomorrow(cls):
         return cls.tomorrow.isoformat(timespec="seconds")
 
     @classmethod
-    def resolve_now(cls, input):
-        return cls.now.strftime("%Y%m%d%H%M%S")
+    def resolve_end_of_life(cls, input):
+        if input is None or input == "":
+            return cls.resolve_tomorrow()
+        return input
 
     @classmethod
     def fold_comma(cls, input):
@@ -503,9 +515,9 @@ class ConfigBuilder:
             "repos"           : self.fold_repos,
             "pkgs"            : self.fold_packages,
             "svcs"            : self.fold_services,
-            "revision"        : self.resolve_now,
+            "revision"        : self.resolve_revision,
             "end_of_life"     : lambda x: \
-                self.force_iso_date(self.resolve_tomorrow(x)),
+                self.force_iso_date(self.resolve_end_of_life(x)),
         }
 
     def build_all(self):
diff --git a/scripts/test-setup_script.sh b/scripts/test-setup_script.sh
new file mode 100755
index 0000000..18e3fdb
--- /dev/null
+++ b/scripts/test-setup_script.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env sh
+
+set -ex
+
+# copy a directory into place
+cp -a ./base "$TARGET/home/$EC2_USER/test"
+
+# process a file and put it into place
+tac ./aarch64 | rev > "$TARGET/home/$EC2_USER/test/46hcraa"
+
+# set ownership of installed things
+chroot "$TARGET" chown -R "$EC2_USER:$EC2_USER" "/home/$EC2_USER/test"