diff --git a/app/.dev-updater.ron b/app/.dev-updater.ron
new file mode 100644
index 0000000..9dd8417
--- /dev/null
+++ b/app/.dev-updater.ron
@@ -0,0 +1,12 @@
+// Read by Dev Updater. Structured as the body of the config: no outer
+// parentheses, so nothing here is indented for the sake of a wrapper.
+
+// Enough to add this project before it has ever been built: with nothing
+// built there is no APK to read an identity out of. A built APK wins over
+// both of these wherever there is one.
+package: "com.example.aiapp",
+label: "AI Sessions",
+
+prepare: (
+    command: ["./build-apk.sh"],
+),
diff --git a/app/.dev-updater.toml b/app/.dev-updater.toml
deleted file mode 100644
index 6653cf0..0000000
--- a/app/.dev-updater.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-package = "com.example.aiapp"
-label = "AI Sessions"
-
-[prepare]
-command = ["./build-apk.sh"]