diff --git a/.github/workflows/evercrypt-rs.yml b/.github/workflows/evercrypt-rs.yml
index df6a3f5..4b6f170 100644
--- a/.github/workflows/evercrypt-rs.yml
+++ b/.github/workflows/evercrypt-rs.yml
@@ -24,15 +24,24 @@ jobs:
       - if: matrix.os == 'ubuntu-latest'
         run: sudo apt -y install pkg-config
       - if: matrix.os == 'macos-latest'
-        run: brew install pkg-config
+        run: |
+          brew install pkg-config
+          sudo rm -Rf /Library/Developer/CommandLineTools/SDKs/*
+          sudo xcode-select -s /Applications/Xcode_12.4.app
+          rustup target install aarch64-apple-darwin
+          rustup target install aarch64-apple-ios
       - name: Build
+        run: cargo build --verbose
+      - name: Apple Silicon Build
+        if: matrix.os == 'macos-latest'
         run: |
-          cd evercrypt-rs
-          cargo build --verbose --release
-      - name: Test evercrypt-sys
+          cargo build --target aarch64-apple-darwin --tests --verbose --features rust-crypto-aes
+          cargo build --release --target aarch64-apple-darwin --tests --verbose --features rust-crypto-aes
+      - name: iOS aarch64
+        if: matrix.os == 'macos-latest'
         run: |
-          cd evercrypt-sys
-          cargo test --verbose
+          cargo build --target aarch64-apple-ios --tests --verbose --features rust-crypto-aes
+          cargo build --release --target aarch64-apple-ios --tests --verbose --features rust-crypto-aes
       - if: matrix.os == 'ubuntu-latest'
         name: Test evercrypt-rs
         run: |
@@ -55,6 +64,11 @@ jobs:
         run: |
           cd evercrypt-rs
           cargo test --verbose --all-features
+      - name: Release (all-features)
+        run: |
+          cd evercrypt-rs
+          cargo clean
+          cargo test --release --verbose --all-features
       - name: Benchmark (rust-crypto-aes)
         run: |
           cd evercrypt-rs
diff --git a/evercrypt-sys/build.rs b/evercrypt-sys/build.rs
index a34aa32..d05bfd6 100644
--- a/evercrypt-sys/build.rs
+++ b/evercrypt-sys/build.rs
@@ -304,8 +304,9 @@ fn main() {
 
     // Make sure we can build for the given OS and architecture.
     let build_config = match target.as_str() {
-        // No 32-bit support on any platform for now.
         "x86_64-apple-darwin" => cfg.set_cross_config_flags(vec!["-target", "x86_64-apple-darwin"]),
+        "aarch64-apple-darwin" => cfg.set_cross_config_flags(vec!["-target", "aarch64-apple-darwin"]),
+        "aarch64-apple-ios" => cfg.set_cross_config_flags(vec!["-target", "aarch64-apple-ios"]),
         "i686-unknown-linux-gnu" => cfg.set_cross_config_flags(vec!["-target", "ia32"]),
         "x86_64-unknown-linux-gnu" => {
             cfg.set_cross_config_flags(vec!["-target", "x86_64-unknown-linux-gnu"])