diff --git a/bun.lock b/bun.lock
index 1282995..2ee3463 100644
--- a/bun.lock
+++ b/bun.lock
@@ -5,7 +5,7 @@
     "": {
       "name": "local",
       "dependencies": {
-        "@mattstack/rt-client": "^0.3.0",
+        "@mattstack/rt-client": "^0.10.1",
         "@mattstack/tui-kit": "file:../tui-kit",
         "react": "19.2.8",
         "react-dom": "19.2.8",
@@ -38,7 +38,7 @@
 
     "@mattstack/glance": ["@mattstack/glance@0.19.0", "", { "dependencies": { "@gitbeaker/rest": "^43.8.0", "@octokit/core": "^7.0.7", "@octokit/graphql": "^9.0.4", "@octokit/plugin-paginate-rest": "^15.0.0", "@octokit/plugin-retry": "^8.1.1", "@octokit/plugin-throttling": "^11.0.5", "@octokit/request-error": "^7.1.1" } }, "sha512-H+QMuyC3IZ3SXl8TpdjIKVhZvx+vP2ltVdt88CDz8e6YFponB2fplyOrHXLvGFITN1EnnEM6DQyYTcQ06F+7fg=="],
 
-    "@mattstack/rt-client": ["@mattstack/rt-client@0.3.0", "", { "dependencies": { "jsonc-parser": "^3.3.1" }, "peerDependencies": { "@mattstack/glance": ">=0.13.0" } }, "sha512-o1X3/mde98vOFd89FvmaSf2K1d5V7BbW3rl/j94wlkaf9/+smtNbeDsVL4bCImLn5ktosVOhXPdvZrMqZISL1Q=="],
+    "@mattstack/rt-client": ["@mattstack/rt-client@0.10.1", "", { "dependencies": { "jsonc-parser": "^3.3.1" }, "peerDependencies": { "@mattstack/glance": ">=0.13.0" } }, "sha512-RndroXypLyHHeJ8RVO9RFt2/DB0im1moG4SUElETTHKgLdpLwPsiMFohEcdH9cIe72JLzt/i9wA1mC/66lq7Ng=="],
 
     "@mattstack/tui-kit": ["@mattstack/tui-kit@file:../tui-kit", { "dependencies": { "@soribashi/core": "file:../soribashi/packages/core", "react-markdown": "^10.1.0", "remark-gfm": "^4.0.1" }, "devDependencies": { "@types/node": "^26.2.0", "@types/react": "^19", "@types/react-dom": "^19", "@types/react-test-renderer": "^19.1.0", "@vitejs/plugin-react": "^6", "@vitest/browser-playwright": "^4.1.10", "playwright": "^1.59.1", "react": "^19.2", "react-dom": "^19.2", "react-test-renderer": "^19.2.8", "typescript": "^7", "vitest": "^4", "vitest-browser-react": "^2" }, "peerDependencies": { "react": "^19.0.0", "react-dom": "^19.0.0" } }],
 
diff --git a/package.json b/package.json
index 2d474d2..8c04ec1 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "deploy": "bun run scripts/deploy.ts"
   },
   "dependencies": {
-    "@mattstack/rt-client": "^0.3.0",
+    "@mattstack/rt-client": "^0.10.1",
     "@mattstack/tui-kit": "file:../tui-kit",
     "react": "19.2.8",
     "react-dom": "19.2.8"
diff --git a/src/api/dev-mode.test.ts b/src/api/dev-mode.test.ts
index af3f745..accf2ed 100644
--- a/src/api/dev-mode.test.ts
+++ b/src/api/dev-mode.test.ts
@@ -1,4 +1,8 @@
 import { test, expect, beforeEach } from "bun:test";
+import { mkdtempSync } from "fs";
+import { tmpdir } from "os";
+import { join } from "path";
+import { setSetting } from "@mattstack/rt-client";
 import { isDevMode, resetDevModeCache } from "./dev-mode.ts";
 
 beforeEach(() => resetDevModeCache());
@@ -18,3 +22,26 @@ test("unset value is production (fail closed)", () => {
 test("a throwing read is production (fail closed)", () => {
   expect(isDevMode({ read: () => { throw new Error("no daemon"); } })).toBe(false);
 });
+
+// The real getSetting path (no injected read), which the cases above bypass.
+// Regression guard for the rt-client bump: `mattstack.mode` must be a registered
+// key, or getSetting throws unknownKey and the gate is stuck fail-closed to prod.
+test("real rt-client path reads mattstack.mode from the store", () => {
+  const origHome = process.env.HOME;
+  process.env.HOME = mkdtempSync(join(tmpdir(), "devmode-real-"));
+  try {
+    resetDevModeCache();
+    expect(isDevMode()).toBe(false); // unset -> prod
+
+    setSetting("mattstack.mode", "prod", "machine");
+    resetDevModeCache();
+    expect(isDevMode()).toBe(false);
+
+    setSetting("mattstack.mode", "dev", "machine");
+    resetDevModeCache();
+    expect(isDevMode()).toBe(true);
+  } finally {
+    process.env.HOME = origHome;
+    resetDevModeCache();
+  }
+});