diff --git a/.env.example b/.env.example
index f8ef39d..f44d933 100644
--- a/.env.example
+++ b/.env.example
@@ -69,11 +69,13 @@ NATIVEPHP_APP_ID=com.simonhamp.devnull
 NATIVEPHP_APP_VERSION="DEBUG"
 NATIVEPHP_APP_VERSION_CODE="1"
 
-# The PHP binaries are php-bin-mobile's 4.2.0-rc.1 until 4.2.0 is released:
+# The PHP binaries are php-bin-mobile's 4.2.0-rc.2 until 4.2.0 is released:
 # OPcache on (JIT off) on iOS and Android, and the bigger buffers that carry a
-# screen to Swift and Kotlin. A prerelease is named as the last part of this
+# screen to Swift and Kotlin. rc.2 is rc.1's code on newer PHP patches, with the
+# checksums and signed manifest mobile-air now checks. It only has PHP 8.4,
+# without ICU. A prerelease is named as the last part of this
 # (NativePHP/mobile-air#559).
-NATIVEPHP_BIN_BRANCH=main/4.2.0-rc.1
+NATIVEPHP_BIN_BRANCH=main/4.2.0-rc.2
 # dev-null.sh sends sign-ins back to devnull://auth/callback. NativePHP's auth
 # session reads the scheme from this file, so it has to be set here.
 NATIVEPHP_DEEPLINK_SCHEME=devnull
diff --git a/composer.lock b/composer.lock
index ddc2f31..d17f7ab 100644
--- a/composer.lock
+++ b/composer.lock
@@ -2721,12 +2721,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/NativePHP/mobile-air.git",
-                "reference": "2eda16dd1a84fd67b67b413df7e2f751b0a841bb"
+                "reference": "557de018ee518d2e347c61a5e223a8564065a422"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/NativePHP/mobile-air/zipball/2eda16dd1a84fd67b67b413df7e2f751b0a841bb",
-                "reference": "2eda16dd1a84fd67b67b413df7e2f751b0a841bb",
+                "url": "https://api.github.com/repos/NativePHP/mobile-air/zipball/557de018ee518d2e347c61a5e223a8564065a422",
+                "reference": "557de018ee518d2e347c61a5e223a8564065a422",
                 "shasum": ""
             },
             "require": {
@@ -2837,7 +2837,7 @@
                 "source": "https://github.com/NativePHP/mobile-air/tree/main",
                 "issues": "https://github.com/NativePHP/mobile-air/issues"
             },
-            "time": "2026-10-22T22:24:28+00:00"
+            "time": "2026-10-22T22:56:03+00:00"
         },
         {
             "name": "nativephp/mobile-browser",