diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 90db335..8fbf4b8 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -16,7 +16,7 @@ jobs:
       - uses: dart-lang/setup-dart@v1
         with:
           sdk: '3.13.0'
-      - uses: dtolnay/rust-toolchain@1.90.0
+      - uses: dtolnay/rust-toolchain@1.99.1
       - run: dart pub get --no-example
       - run: dart analyze lib test hook
       - run: dart test
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8262515..bca0eea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## Unreleased
+
+* Pin Rust 1.99.1. Earlier toolchains strip Apple dynamic libraries with a misaligned `__LINKEDIT` string pool, which iOS 27 and macOS 27 refuse to load.
+
 ## 0.3.0
 
 * Build Rust automatically with native assets (Dart 3.13+, Rust 1.90.0).
diff --git a/README.md b/README.md
index a78864f..ac19067 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Dart bindings for the Serai FROST multisig implementation. Rust sources live in
 Requires Dart 3.13+ (or a Flutter SDK containing it), Rust installed with rustup,
 and the platform's C build tools: Xcode for Apple, the Android NDK, a Linux C
 compiler, or Visual Studio's C++ build tools on Windows. Put `rustup` on PATH.
-The hook locates the pinned Rust 1.90.0 tools and installs the target as needed.
+The hook locates the pinned Rust 1.99.1 tools and installs the target as needed.
 
 ```sh
 dart pub get --no-example
diff --git a/src/serai/hrf/rust-toolchain.toml b/src/serai/hrf/rust-toolchain.toml
index c3891f0..0b8307a 100644
--- a/src/serai/hrf/rust-toolchain.toml
+++ b/src/serai/hrf/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.90.0"
+channel = "1.99.1"
 profile = "minimal"