diff --git a/.github/workflows/vdf-client-hw.yml b/.github/workflows/vdf-client-hw.yml
index 0613ecd9..5faec8c1 100644
--- a/.github/workflows/vdf-client-hw.yml
+++ b/.github/workflows/vdf-client-hw.yml
@@ -36,7 +36,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-13-intel, macos-13-arm64, windows-latest]
+        os: [ubuntu-latest, ubuntu-24.04-arm, macos-13-intel, macos-13-arm64, windows-latest]
         config: [optimized=1, TSAN=1, ASAN=1]
         exclude:
           - os: windows-latest
@@ -70,12 +70,12 @@ jobs:
       # Apply before build because make TSAN=1 runs ./compile_asm during build.
       # See: https://github.com/google/sanitizers/issues/1716
       - name: Adjust mmap_rnd_bits before Ubuntu TSAN build/test execution
-        if: matrix.os == 'ubuntu-latest' && matrix.config == 'TSAN=1'
+        if: startsWith(matrix.os, 'ubuntu') && matrix.config == 'TSAN=1'
         run: |
           sudo sysctl vm.mmap_rnd_bits=28
 
       - name: Build on Ubuntu
-        if: matrix.os == 'ubuntu-latest'
+        if: startsWith(matrix.os, 'ubuntu')
         run: |
           # Keep mmap_rnd_bits workaround step above this build for TSAN=1:
           # make TSAN=1 executes thread-sanitized ./compile_asm during build.
@@ -237,7 +237,7 @@ jobs:
           }
 
       - name: Run HW smoke test (Ubuntu/macOS)
-        if: matrix.os != 'windows-latest' && (matrix.config != 'TSAN=1' || matrix.os == 'ubuntu-latest')
+        if: matrix.os != 'windows-latest' && (matrix.config != 'TSAN=1' || startsWith(matrix.os, 'ubuntu'))
         run: |
           cd src
           # CI runners do not have FT4222 hardware attached; only validate binaries exist.
@@ -249,7 +249,7 @@ jobs:
           ./emu_hw_vdf_client --list
 
       - name: Run vdf tests (optimized smoke)
-        if: matrix.config == 'optimized=1' && matrix.os != 'windows-latest' && matrix.os != 'ubuntu-latest'
+        if: matrix.config == 'optimized=1' && matrix.os != 'windows-latest' && !startsWith(matrix.os, 'ubuntu')
         run: |
           cd src
           echo "Running 1weso_test (fast smoke)"
@@ -258,7 +258,7 @@ jobs:
           ./2weso_test 1000
 
       - name: Run vdf tests (optimized protected threshold path)
-        if: matrix.config == 'optimized=1' && matrix.os == 'ubuntu-latest'
+        if: matrix.config == 'optimized=1' && startsWith(matrix.os, 'ubuntu')
         run: |
           cd src
           echo "Running 1weso_test (fast smoke)"
@@ -280,7 +280,7 @@ jobs:
       # it prints to std::cout from multiple threads. Which is allowed by the
       # standard
       - name: Run prover test (Ubuntu/macOS)
-        if: matrix.os != 'windows-latest' && (matrix.config != 'TSAN=1' || matrix.os == 'ubuntu-latest')
+        if: matrix.os != 'windows-latest' && (matrix.config != 'TSAN=1' || startsWith(matrix.os, 'ubuntu'))
         run: |
           cd src
           echo "Running prover_test"
@@ -364,8 +364,25 @@ jobs:
           .\vdf_bench.exe square_asm 2000000
           if ($LASTEXITCODE -ne 0) { throw "vdf_bench failed with exit code $LASTEXITCODE" }
 
-      - name: Upload binaries artifact (Ubuntu/macOS)
-        if: matrix.os != 'windows-latest' && matrix.config == 'optimized=1'
+      - name: Upload binaries artifact (Ubuntu)
+        if: startsWith(matrix.os, 'ubuntu') && matrix.config == 'optimized=1'
+        uses: actions/upload-artifact@v6
+        with:
+          name: binaries-${{ matrix.config }}-${{ matrix.os }}
+          path: |
+            src/vdf_client
+            src/vdf_bench
+            src/1weso_test
+            src/2weso_test
+            src/prover_test
+            src/emu_hw_test
+            src/hw_test
+            src/emu_hw_vdf_client
+            src/hw_vdf_client
+            ${{ matrix.os == 'ubuntu-24.04-arm' && 'src/hw/libft4222/build-arm-v8/libft4222.so' || 'src/hw/libft4222/build-x86_64/libft4222.so' }}
+
+      - name: Upload binaries artifact (macOS)
+        if: startsWith(matrix.os, 'macos') && matrix.config == 'optimized=1'
         uses: actions/upload-artifact@v6
         with:
           name: binaries-${{ matrix.config }}-${{ matrix.os }}
@@ -379,7 +396,6 @@ jobs:
             src/hw_test
             src/emu_hw_vdf_client
             src/hw_vdf_client
-            src/hw/libft4222/build-x86_64/libft4222.so
             src/hw/libft4222/*.dylib
 
       - name: Upload binaries artifact (Windows)
@@ -402,11 +418,12 @@ jobs:
             mpir_gc_x64/*.dll
 
       - name: Assemble Ubuntu .deb (same runner as build)
-        if: matrix.os == 'ubuntu-latest' && matrix.config == 'optimized=1'
+        if: startsWith(matrix.os, 'ubuntu') && matrix.config == 'optimized=1'
         env:
           RELEASE_TAG: ${{ github.event_name == 'release' && github.event.release.tag_name || '' }}
           INSTALLER_VERSION: "${{ github.event_name == 'release' && github.event.release.tag_name || format('0.0.1-{0}', github.run_id) }}"
-          PLATFORM: "amd64"
+          PLATFORM: ${{ matrix.os == 'ubuntu-24.04-arm' && 'arm64' || 'amd64' }}
+          LIBFT4222_DIR: ${{ matrix.os == 'ubuntu-24.04-arm' && 'build-arm-v8' || 'build-x86_64' }}
         run: |
           pip install jinjanator
           CLI_DEB_BASE="chiavdf_$INSTALLER_VERSION-1_$PLATFORM"
@@ -422,19 +439,19 @@ jobs:
           cp src/hw_test dist/$CLI_DEB_BASE/usr/bin/
           cp src/hw_vdf_client dist/$CLI_DEB_BASE/usr/bin/
           cp src/emu_hw_vdf_client dist/$CLI_DEB_BASE/usr/bin/
-          cp src/hw/libft4222/build-x86_64/libft4222.so dist/$CLI_DEB_BASE/usr/lib/
+          cp "src/hw/libft4222/$LIBFT4222_DIR/libft4222.so" dist/$CLI_DEB_BASE/usr/lib/
           echo 'SUBSYSTEM=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="601c", MODE="0666"' > dist/$CLI_DEB_BASE/etc/udev/rules.d/99-chiavdf.rules
           dpkg-deb --build --root-owner-group "dist/$CLI_DEB_BASE"
 
       - name: Upload Ubuntu installer
-        if: matrix.os == 'ubuntu-latest' && matrix.config == 'optimized=1'
+        if: startsWith(matrix.os, 'ubuntu') && matrix.config == 'optimized=1'
         uses: actions/upload-artifact@v6
         with:
-          name: installer
+          name: installer-${{ matrix.os }}
           path: dist/*.deb
 
       - name: Upload release artifacts
-        if: matrix.os == 'ubuntu-latest' && matrix.config == 'optimized=1' && github.event_name == 'release'
+        if: startsWith(matrix.os, 'ubuntu') && matrix.config == 'optimized=1' && github.event_name == 'release'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           RELEASE_TAG: ${{ github.event.release.tag_name }}
diff --git a/.gitignore b/.gitignore
index 15b54e97..1e1a2618 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,6 +45,7 @@ src/hw_vdf_client
 
 # external library
 /src/hw/libft4222
+/src/libft4222/
 
 # pyenv
 .python-version
diff --git a/scripts/get-libft4222.sh b/scripts/get-libft4222.sh
index 0bca8601..71442e6d 100755
--- a/scripts/get-libft4222.sh
+++ b/scripts/get-libft4222.sh
@@ -92,10 +92,22 @@ install_linux() {
   fetch_with_retry "$LINUX_URL" "$LINUX_ARCHIVE" tgz 3
   tar -xzf "$LINUX_ARCHIVE" -C "$WORK_DIR"
 
+  local linux_arch
+  linux_arch="$(uname -m)"
+  local libft4222_dir
+  case "$linux_arch" in
+    x86_64) libft4222_dir="build-x86_64" ;;
+    aarch64|arm64) libft4222_dir="build-arm-v8" ;;
+    *)
+      echo "Unsupported Linux architecture for libft4222: $linux_arch" >&2
+      exit 1
+      ;;
+  esac
+
   rm -rf "$HW_DIR"
   ln -s "$WORK_DIR" "$HW_DIR"
-  ln -sf "$WORK_DIR/build-x86_64/libft4222.so.1.4.4.170" \
-    "$WORK_DIR/build-x86_64/libft4222.so"
+  ln -sf "$WORK_DIR/$libft4222_dir/libft4222.so.1.4.4.170" \
+    "$WORK_DIR/$libft4222_dir/libft4222.so"
 }
 
 install_macos() {
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 23f1ab6e..f3b28e1b 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -458,8 +458,18 @@ if(BUILD_HW_TOOLS)
     )
     set(HW_SOCKET_LIBS)
   else()
+    string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" HW_ARCH_LOWER)
+    if(HW_ARCH_LOWER STREQUAL "x86_64" OR HW_ARCH_LOWER STREQUAL "amd64")
+      set(HW_LIB_DIR "build-x86_64")
+    elseif(HW_ARCH_LOWER STREQUAL "aarch64" OR HW_ARCH_LOWER STREQUAL "arm64" OR HW_ARCH_LOWER MATCHES "^armv8")
+      set(HW_LIB_DIR "build-arm-v8")
+    else()
+      message(FATAL_ERROR
+        "Unsupported Linux architecture for FT4222 hardware tools: ${CMAKE_SYSTEM_PROCESSOR}. "
+        "Expected one of: x86_64, amd64, aarch64, arm64, armv8*.")
+    endif()
     set(HW_LIBS
-      ${CMAKE_CURRENT_SOURCE_DIR}/hw/libft4222/build-x86_64/libft4222.so
+      ${CMAKE_CURRENT_SOURCE_DIR}/hw/libft4222/${HW_LIB_DIR}/libft4222.so
     )
     set(HW_SOCKET_LIBS)
   endif()
diff --git a/src/Makefile.vdf-client b/src/Makefile.vdf-client
index 66c5b93a..59fcbb63 100644
--- a/src/Makefile.vdf-client
+++ b/src/Makefile.vdf-client
@@ -1,5 +1,12 @@
 UNAME := $(shell uname)
-ARCH := $(shell uname -m)
+# Allow callers/CI to override ARCH, otherwise detect from host.
+ARCH ?= $(shell uname -m)
+ARCH_CANON := $(ARCH)
+ifeq ($(ARCH_CANON),amd64)
+ARCH_CANON := x86_64
+else ifeq ($(ARCH_CANON),arm64)
+ARCH_CANON := aarch64
+endif
 GIT_DESCRIBE := $(strip $(shell git describe --tags --always 2>/dev/null))
 CHIAVDF_VERSION ?= $(if $(GIT_DESCRIBE),$(GIT_DESCRIBE),dev)
 
@@ -64,7 +71,7 @@ endif
 .PHONY: all clean
 
 # Only x86_64 builds use the x86 asm objects
-ifeq ($(ARCH),x86_64)
+ifeq ($(ARCH_CANON),x86_64)
 ASM_OBJS = asm_compiled.o avx2_asm_compiled.o avx512_asm_compiled.o
 else
 ASM_OBJS =
@@ -108,7 +115,14 @@ HW_LIB = hw/libft4222/libft4222.dylib
 HW_FTD2XX_LIB = hw/libft4222/libftd2xx.dylib
 HW_LIBS = $(HW_LIB) $(HW_FTD2XX_LIB)
 else
-HW_LIB = hw/libft4222/build-x86_64/libft4222.so
+ifeq ($(ARCH_CANON),x86_64)
+HW_LIB_DIR = build-x86_64
+else ifeq ($(ARCH_CANON),aarch64)
+HW_LIB_DIR = build-arm-v8
+else
+$(error Unsupported Linux architecture for FT4222 hardware tools: $(ARCH). Expected one of: x86_64, aarch64/arm64, amd64)
+endif
+HW_LIB = hw/libft4222/$(HW_LIB_DIR)/libft4222.so
 HW_LIBS = $(HW_LIB)
 endif
 endif