diff --git a/package-lock.json b/package-lock.json
index 404dabb3906d..c898c1f7f5c3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -115,7 +115,7 @@
         "react-native-localize": "^3.5.4",
         "react-native-nitro-modules": "0.35.0",
         "react-native-nitro-sqlite": "9.6.0",
-        "react-native-onyx": "3.0.63",
+        "react-native-onyx": "3.0.66",
         "react-native-pager-view": "8.0.0",
         "react-native-pdf": "7.0.2",
         "react-native-permissions": "^5.4.0",
@@ -34481,9 +34481,9 @@
       }
     },
     "node_modules/react-native-onyx": {
-      "version": "3.0.63",
-      "resolved": "https://registry.npmjs.org/react-native-onyx/-/react-native-onyx-3.0.63.tgz",
-      "integrity": "sha512-6UUpjyUh9viXll9M2YomXM9PMg+791foSPA7E0fazgWfrUAmofNwo4xkXT4k3NDdToZFOYxaXL0uw5z00g/MOA==",
+      "version": "3.0.66",
+      "resolved": "https://registry.npmjs.org/react-native-onyx/-/react-native-onyx-3.0.66.tgz",
+      "integrity": "sha512-pNDHZsJeSCJPrV9gw4igSTWXx8dayIaTkCQrRaENEPlbDNdRCSP7LSEc2VvyyMwDXRFCL/7CmXZOwRnF6wsUfg==",
       "license": "MIT",
       "dependencies": {
         "ascii-table": "0.0.9",
diff --git a/package.json b/package.json
index 138faffb48a7..574d9dcfb4ca 100644
--- a/package.json
+++ b/package.json
@@ -178,7 +178,7 @@
     "react-native-localize": "^3.5.4",
     "react-native-nitro-modules": "0.35.0",
     "react-native-nitro-sqlite": "9.6.0",
-    "react-native-onyx": "3.0.63",
+    "react-native-onyx": "3.0.66",
     "react-native-pager-view": "8.0.0",
     "react-native-pdf": "7.0.2",
     "react-native-permissions": "^5.4.0",
diff --git a/patches/react-native-onyx/details.md b/patches/react-native-onyx/details.md
index 67ad7c054e85..719206af5632 100644
--- a/patches/react-native-onyx/details.md
+++ b/patches/react-native-onyx/details.md
@@ -1,6 +1,6 @@
 # `react-native-onyx` patches
 
-### [react-native-onyx+3.0.63.patch](react-native-onyx+3.0.63.patch)
+### [react-native-onyx+3.0.66.patch](react-native-onyx+3.0.66.patch)
 
 - Reason: Onyx v3.0.59 ([PR #756](https://github.com/Expensify/react-native-onyx/pull/756)) added a state reset inside the `subscribe` callback of `useOnyx` to fix stale data when keys change dynamically. However, this reset runs unconditionally — including on initial mount — which causes `useSyncExternalStore` to see a new snapshot reference after subscription, triggering one extra render per `useOnyx` hook. This patch guards the reset with a `hasMountedRef` flag so it only runs on key-change re-subscriptions, not on initial mount.
 - E/App issue: https://github.com/Expensify/App/issues/85416
diff --git a/patches/react-native-onyx/react-native-onyx+3.0.63.patch b/patches/react-native-onyx/react-native-onyx+3.0.66.patch
similarity index 100%
rename from patches/react-native-onyx/react-native-onyx+3.0.63.patch
rename to patches/react-native-onyx/react-native-onyx+3.0.66.patch