diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b95e9c0..d064003 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,7 +29,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.89.0"
+          toolchain: "1.99.1"
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -79,7 +79,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.89.0"
+          toolchain: "1.99.1"
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -115,7 +115,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.89.0"
+          toolchain: "1.99.1"
 
       - uses: Swatinem/rust-cache@v2
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0763729..aa34bbb 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -35,8 +35,8 @@ jobs:
 
       - name: Select Rust toolchain
         run: |
-          rustup toolchain install 1.89.0 --profile minimal --target "${{ matrix.target }}"
-          rustup default 1.89.0
+          rustup toolchain install 1.99.1 --profile minimal --target "${{ matrix.target }}"
+          rustup default 1.99.1
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -81,8 +81,8 @@ jobs:
 
       - name: Select Rust toolchain
         run: |
-          rustup toolchain install 1.89.0 --profile minimal --target "${{ matrix.target }}"
-          rustup default 1.89.0
+          rustup toolchain install 1.99.1 --profile minimal --target "${{ matrix.target }}"
+          rustup default 1.99.1
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -126,7 +126,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.89.0"
+          toolchain: "1.99.1"
           targets: ${{ matrix.target }}
 
       - uses: Swatinem/rust-cache@v2
@@ -162,7 +162,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.89.0"
+          toolchain: "1.99.1"
           targets: ${{ matrix.target }}
 
       - uses: Swatinem/rust-cache@v2
@@ -192,7 +192,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.89.0"
+          toolchain: "1.99.1"
           targets: x86_64-pc-windows-msvc
 
       - uses: Swatinem/rust-cache@v2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77f6ef5..bf04277 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## 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.
 - Add opt-in verified native downloads and release manifests.
 - Require Flutter 3.47 and Dart 3.13.
 - Build and bundle the Rust dynamic library with Flutter Native Assets.
diff --git a/README.md b/README.md
index 40798b9..da44863 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ instead of the former plugin packaging and platform-specific download scripts.
 
 - Flutter 3.47 or newer
 - Dart 3.13 or newer
-- For source builds: Rust 1.89.0 through `rustup` (selected by
+- For source builds: Rust 1.99.1 through `rustup` (selected by
   [`rust/rust-toolchain.toml`](rust/rust-toolchain.toml))
 - The normal native build tools for the target platform: Xcode on Apple
   platforms, the Android NDK for Android, a C/C++ toolchain and CMake on
diff --git a/rust/rust-toolchain.toml b/rust/rust-toolchain.toml
index aa11bc4..44d92be 100644
--- a/rust/rust-toolchain.toml
+++ b/rust/rust-toolchain.toml
@@ -1,5 +1,5 @@
 [toolchain]
-channel = "1.89.0"
+channel = "1.99.1"
 profile = "minimal"
 
 targets = [