diff --git a/README.md b/README.md
index af38f88..842e6ce 100644
--- a/README.md
+++ b/README.md
@@ -14,4 +14,4 @@ cd scripts/[platform]
 
 or `build_all.bat` for Windows.
 
-Rust 1.71.0 is required.  `[rustup](https://rustup.rs/) toolchain install 1.71.0-x86_64-pc-windows-msvc` for Windows.
+Rust 1.71.0 or newer is required.  `[rustup](https://rustup.rs/) toolchain install 1.71.0-x86_64-pc-windows-msvc` for Windows.
diff --git a/scripts/android/build_all.sh b/scripts/android/build_all.sh
index d8ebdef..c81fd6b 100755
--- a/scripts/android/build_all.sh
+++ b/scripts/android/build_all.sh
@@ -46,7 +46,13 @@ sed -i "s/\[dependencies\]/\[dependencies\]\\
 openssl = { version = \"0.10\", features = [\"vendored\"] }/" Cargo.toml
 
 rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android
-cargo ndk -t armeabi-v7a -t arm64-v8a -t x86_64 -o "$ROOT_DIR"/android/src/main/jniLibs build --release
+cargo ndk \
+  --target armv7-linux-androideabi \
+  --target aarch64-linux-android \
+  --target x86_64-linux-android \
+  --output-dir "$ROOT_DIR"/android/src/main/jniLibs \
+  --platform 21 \
+  build --release
 
 mv "$ROOT_DIR"/android/src/main/jniLibs/armeabi-v7a/libhrf_api.so "$ROOT_DIR"/android/src/main/jniLibs/armeabi-v7a/frostdart.so
 mv "$ROOT_DIR"/android/src/main/jniLibs/arm64-v8a/libhrf_api.so "$ROOT_DIR"/android/src/main/jniLibs/arm64-v8a/frostdart.so