diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index e36b9aab..e0537baa 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -154,7 +154,7 @@ jobs:
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
       - name: Install mdbook
         run: |
-          cargo install mdbook --no-default-features --features output --vers "^0.1.0"
+          cargo install --force mdbook --no-default-features --features output --vers "^0.1.0"
       - name: Build
         run: mdbook build
       - name: Deploy to maxammann.org
diff --git a/src/render/platform_constants.rs b/src/render/platform_constants.rs
index bf79319b..9203caa7 100644
--- a/src/render/platform_constants.rs
+++ b/src/render/platform_constants.rs
@@ -4,11 +4,12 @@ pub const COLOR_TEXTURE_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Bgra8
 // WebGL
 #[cfg(all(target_arch = "wasm32", feature = "web-webgl"))]
 pub const COLOR_TEXTURE_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Rgba8UnormSrgb;
-// Vulkan/Metal/OpenGL
+// Vulkan/OpenGL
 #[cfg(target_os = "linux")]
 pub const COLOR_TEXTURE_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Bgra8UnormSrgb;
 
-#[cfg(target_arch = "aarch64")]
+// macOS and iOS (Metal)
+#[cfg(all(target_arch = "aarch64", not(target_os = "android")))]
 pub const COLOR_TEXTURE_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Bgra8UnormSrgb;
 
 #[cfg(target_os = "android")]