diff --git a/CHANGELOG.md b/CHANGELOG.md
index 22d663dd1..c0b7c8f23 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,34 @@
 # Changelog
 
+## [1.91.62.0] - 2026-10-08
+
+**A Rails repair can now finish verifying on arm64.**
+
+On arm64, every Rails verification failed with `ISOLATION_FAILED`, reporting either "Exact reproduction cleanup failed" or "Attempt watchdog did not acknowledge execution-copy cleanup". Neither cleanup was broken. One attempt prepares the application twice, and an offline Rails preparation that compiles native gems takes 6.8 to 8.5 minutes on a 4-vCPU arm64 runner, against about 3.5 minutes on amd64. The 900-second attempt bound expired during the second preparation, the watchdogs cleaned up on schedule, and the helper reported that deadline as a cleanup failure.
+
+### The numbers that matter
+
+Measured on Ubicloud 4-vCPU runners with the staged Rails image from staging run 37735865870 and gstack 1d1ce39b4. Each figure is the start-to-kill time of one Docker group, taken from `docker events`.
+
+| Rails verification step | amd64 | arm64 |
+|---|---|---|
+| Offline preparation (each of the two phases) | 3.3–3.5 min | 6.8–8.5 min |
+| Phase observation (boot, controls, tests) | 8–10 s | 14–26 s |
+| Where the 900 s attempt ended | finished in about 8 min | killed during the second preparation, 3 of 3 arm64 reference repairs |
+| Attempt bound | 900 s | 1,800 s, still cut to the run's reporting deadline |
+
+### What this means for you
+
+Rails repairs on arm64 hosts, including Apple silicon Docker, can now reach `runtime_tested` and replay. Node, Bun and Python keep their 300-second attempt.
+
+### Itemized changes
+
+#### Fixed
+- `MAX_VERIFICATION_ATTEMPT_MS`, the Rails attempt and replay bound, is now 1,800 seconds. That equals the longest comprehensive run budget, and each attempt is still cut to the run's reporting deadline. The attempt watchdog, the Docker verification executor and the assertion witness lifetime share this bound.
+
+#### For contributors
+- `test/cso-cli-lifecycle.test.ts` pins the new bound.
+
 ## [1.91.60.0] - 2026-10-08
 
 **Windows setup finishes when the optional /cso helper fails to build, and it tells you when Smart App Control blocks gstack's binaries.**
diff --git a/VERSION b/VERSION
index 6837f2329..aaeb28599 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.91.60.0
+1.91.62.0
diff --git a/agents-digest/gstack-AGENTS.md b/agents-digest/gstack-AGENTS.md
index fb752c3d5..ac470d8a5 100644
--- a/agents-digest/gstack-AGENTS.md
+++ b/agents-digest/gstack-AGENTS.md
@@ -1,4 +1,4 @@
-# gstack digest v1.91.60.0 — regenerate/re-copy after upgrading gstack
+# gstack digest v1.91.62.0 — regenerate/re-copy after upgrading gstack
 
 Behavioral rules from gstack (https://github.com/garrytan/gstack), compressed
 for agent hosts without a full skill install. The full skills add workflows,
diff --git a/lib/cso/contracts.ts b/lib/cso/contracts.ts
index a6004114a..ad725df10 100644
--- a/lib/cso/contracts.ts
+++ b/lib/cso/contracts.ts
@@ -3,8 +3,13 @@ import { createHash } from 'node:crypto';
 
 export const ABI = 3;
 export const MAX_OUTPUT = 1024 * 1024;
-/** Longest bounded verification attempt (a Rails attempt prepares two dependency trees); other stacks use 300 s. */
-export const MAX_VERIFICATION_ATTEMPT_MS = 900_000;
+/**
+ * Longest bounded verification attempt, used by Rails: one attempt prepares two dependency trees, and an
+ * offline Rails preparation that compiles native gems takes about 3.5 minutes on amd64 and 8.5 on arm64.
+ * It equals the longest comprehensive run budget, and every attempt is still cut to the run's reporting
+ * deadline. Other stacks use 300 s.
+ */
+export const MAX_VERIFICATION_ATTEMPT_MS = 1_800_000;
 const UNSAFE_STRING_CONTROLS =
   /[\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\x9f\u061c\u200e\u200f\u2028-\u202e\u2066-\u2069]/u;
 const UNSAFE_PROPERTY_CONTROLS = /[\x00-\x1f\x7f-\x9f\u061c\u200e\u200f\u2028-\u202e\u2066-\u2069]/u;
diff --git a/package.json b/package.json
index 6156f4bfa..ccbf2212d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "1.91.60",
+  "version": "1.91.62",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",
diff --git a/test/cso-cli-lifecycle.test.ts b/test/cso-cli-lifecycle.test.ts
index ef5f0eff6..d3d502f34 100644
--- a/test/cso-cli-lifecycle.test.ts
+++ b/test/cso-cli-lifecycle.test.ts
@@ -90,6 +90,6 @@ describe('bounded verification attempts', () => {
     const { MAX_VERIFICATION_ATTEMPT_MS } = await import('../lib/cso/contracts');
     for (const stack of ['node', 'bun', 'python']) expect(verificationAttemptMs(stack)).toBe(300_000);
     expect(verificationAttemptMs('rails')).toBe(MAX_VERIFICATION_ATTEMPT_MS);
-    expect(MAX_VERIFICATION_ATTEMPT_MS).toBe(900_000);
+    expect(MAX_VERIFICATION_ATTEMPT_MS).toBe(1_800_000);
   });
 });