diff --git a/install-wear.sh b/install-wear.sh
new file mode 100755
index 0000000..d1c3de9
--- /dev/null
+++ b/install-wear.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Install prrrrrrrrr on a Wear OS watch (armeabi-v7a / 32-bit ARM).
+# Connect the watch via ADB (Wi-Fi or USB debugging) before running.
+
+set -euo pipefail
+
+adb uninstall me.jappie.prrrrrrrrr 2>/dev/null || true
+adb install "$(nix-build nix/apk.nix --argstr androidArch armv7a)/prrrrrrrrr.apk"
diff --git a/nix/android.nix b/nix/android.nix
index 74d715b..aeacc0a 100644
--- a/nix/android.nix
+++ b/nix/android.nix
@@ -1,10 +1,11 @@
 # Android shared library — uses haskell-mobile's lib.nix.
 { sources ? import ../npins
+, androidArch ? "aarch64"
 , mainModule ? ../app/MobileMain.hs
 }:
 let
   haskellMobileSrc = sources.haskell-mobile;
-  lib = import "${haskellMobileSrc}/nix/lib.nix" { inherit sources; };
+  lib = import "${haskellMobileSrc}/nix/lib.nix" { inherit sources androidArch; };
 in
 lib.mkAndroidLib {
   inherit haskellMobileSrc mainModule;
diff --git a/nix/apk.nix b/nix/apk.nix
index 8d46c2e..7b697b5 100644
--- a/nix/apk.nix
+++ b/nix/apk.nix
@@ -1,12 +1,13 @@
 # APK packaging — uses haskell-mobile's lib.nix.
-{ sources ? import ../npins }:
+{ sources ? import ../npins, androidArch ? "aarch64" }:
 let
   haskellMobileSrc = sources.haskell-mobile;
-  lib = import "${haskellMobileSrc}/nix/lib.nix" { inherit sources; };
-  sharedLib = import ./android.nix { inherit sources; };
+  abiDir = { aarch64 = "arm64-v8a"; armv7a = "armeabi-v7a"; }.${androidArch};
+  lib = import "${haskellMobileSrc}/nix/lib.nix" { inherit sources androidArch; };
+  sharedLib = import ./android.nix { inherit sources androidArch; };
 in
 lib.mkApk {
-  inherit sharedLib;
+  sharedLibs = [{ lib = sharedLib; inherit abiDir; }];
   androidSrc = ../android;
   apkName = "prrrrrrrrr.apk";
   name = "prrrrrrrrr-apk";
diff --git a/npins/sources.json b/npins/sources.json
index a998f7b..cbba99e 100644
--- a/npins/sources.json
+++ b/npins/sources.json
@@ -9,9 +9,9 @@
       },
       "branch": "master",
       "submodules": false,
-      "revision": "29d821c470163c29793e4068ec147883af57ec29",
-      "url": "https://github.com/jappeace/haskell-mobile/archive/29d821c470163c29793e4068ec147883af57ec29.tar.gz",
-      "hash": "sha256-umDNrUFu9/euQ5bq4OzwOYyuvTXfvNAAVg5nO7lF7gM="
+      "revision": "93516d40ed92695a1e8cbfc9711f60a9c1bb54ed",
+      "url": "https://github.com/jappeace/haskell-mobile/archive/93516d40ed92695a1e8cbfc9711f60a9c1bb54ed.tar.gz",
+      "hash": "sha256-lqg6cUatXNJdjYKhpvmwajlhVne2jVdr4ShT0slT+OI="
     },
     "nixpkgs": {
       "type": "Channel",