diff --git a/.github/workflows/BuildCommanderConda.yml b/.github/workflows/BuildCommanderConda.yml
index 00a9355..ea450a3 100644
--- a/.github/workflows/BuildCommanderConda.yml
+++ b/.github/workflows/BuildCommanderConda.yml
@@ -14,9 +14,8 @@ on:
 
 env:
   QEMU_STATIC_VERSION: "v3.1.0-3"
-  MINIFORGE_URL: "https://github.com/conda-forge/miniforge/releases/download/4.8.5-1"
-  MINIFORGE_FILE: "Miniforge3-4.8.5-1-MacOSX-x86_64.sh"
-  MINIFORGE_SHA256: "5054599ee6ea639209b831d859935da50229040d7993b1736358734d1e9c5edc"
+  MINIFORGE_VERSION: "4.12.0-2" # needs to be updated in matrix section too--fix this.
+  MINIFORGE_URL: "https://github.com/conda-forge/miniforge/releases/download"
 
 jobs:
   build:
@@ -30,9 +29,19 @@ jobs:
       matrix:
         os: [ubuntu-18.04]
         arch: [x86_64, aarch64, ppc64le]
+        TARGET_PLATFORM: [linux-64]
         include:
           - os: macos-latest
             arch: x86_64
+            MINIFORGE_FILE: "Mambaforge-4.12.0-2-MacOSX-x86_64.sh"
+            MINIFORGE_SHA256: "562c2bcbabff10387f130acea72b960454fa3d90b593126e4e4febcf6da763d3"
+            TARGET_PLATFORM: osx-64
+          - os: macos-latest
+            arch: arm64
+            MINIFORGE_FILE: "Mambaforge-4.12.0-2-MacOSX-arm64.sh"
+            MINIFORGE_SHA256: "2e2be9d976da31b62ab314881d3c6ed3f65c76e3ea69cc4b59fb344780109026"
+            TARGET_PLATFORM: osx-arm64
+
     outputs:
       checksum1: ${{ steps.cksums.outputs.out-0 }}
       checksum2: ${{ steps.cksums.outputs.out-1 }}
@@ -43,6 +52,7 @@ jobs:
     env:
       COMMANDERCONDA_NAME: CommanderConda3
       ARCH: ${{ matrix.arch }}
+      TARGET_PLATFORM: ${{ matrix.TARGET_PLATFORM }}
     steps:
       - uses: actions/checkout@v2
       - uses: actions/cache@v1
@@ -68,21 +78,34 @@ jobs:
         if: runner.os == 'macOS'
         with:
           path: build/miniforge
-          key: miniforge-${{ env.MINIFORGE_SHA256 }}-${{ hashFiles('.github/workflows/BuildCommanderConda.yml') }}
+          key: miniforge-${{ matrix.MINIFORGE_SHA256 }}-${{ hashFiles('.github/workflows/BuildCommanderConda.yml') }}
       - name: get miniforge
         if: steps.cache-miniforge.outputs.cache-hit != 'true' && runner.os == 'macOS'
         run: |
           mkdir -p ./build/miniforge || true
           cd ./build/miniforge
-          curl -L -O "${MINIFORGE_URL}/${MINIFORGE_FILE}"
+          echo "curl -L -s \"${MINIFORGE_URL}/${MINIFORGE_VERSION}/${{ matrix.MINIFORGE_FILE }}\" > \"${{ matrix.MINIFORGE_FILE }}\""
+          curl -L -s "${MINIFORGE_URL}/${MINIFORGE_VERSION}/${{ matrix.MINIFORGE_FILE }}" > "${{ matrix.MINIFORGE_FILE }}"
       - name: verify minforge checksum
         if: runner.os == 'macOS'
         working-directory: build/miniforge
+        env:
+          MINIFORGE_FILE: ${{ matrix.MINIFORGE_FILE }}
         run: |
-          echo "${MINIFORGE_SHA256} *${MINIFORGE_FILE}" | tee ${MINIFORGE_FILE}.sha256
+          echo "${{ matrix.MINIFORGE_SHA256 }} *${MINIFORGE_FILE}" | tee ${MINIFORGE_FILE}.sha256
           shasum -c ./${MINIFORGE_FILE}.sha256
       - name: Build and test CommanderConda
-        run: ./build_CommanderConda_${{ runner.os }}.sh
+        env:
+          MINIFORGE_FILE: build/miniforge/${{ matrix.MINIFORGE_FILE }}
+        run: |
+          if [[ "${{ runner.os }}" == Linux ]] ; then
+            if [[ "$ARCH" != x86_64 ]] ; then
+              TARGET_PLATFORM="linux-$ARCH"
+            fi
+          fi
+          export TARGET_PLATFORM
+          echo "Target arch: ${TARGET_PLATFORM}"
+          ./build_CommanderConda_${{ runner.os }}.sh
       - name: Checksum Outputs
         id: cksums
         working-directory: build
diff --git a/CommanderConda/construct.yaml b/CommanderConda/construct.yaml
index 4737e44..0bc9fc5 100644
--- a/CommanderConda/construct.yaml
+++ b/CommanderConda/construct.yaml
@@ -1,4 +1,4 @@
-{% set version = os.environ.get("COMMANDERCONDA_VERSION", "4.12.0-0") %}
+{% set version = os.environ.get("COMMANDERCONDA_VERSION", "4.12.0-2") %}
 
 
 name: CommanderConda3
diff --git a/build_CommanderConda_Linux.sh b/build_CommanderConda_Linux.sh
index fa5aea7..2443eed 100755
--- a/build_CommanderConda_Linux.sh
+++ b/build_CommanderConda_Linux.sh
@@ -22,6 +22,7 @@ esac
 
 export DOCKER_ARCH
 export DOCKERIMAGE
+export TARGET_PLATFORM
 
 echo "============= Create build directory ============="
 mkdir -p build/ || true
@@ -32,7 +33,7 @@ docker run --rm --privileged multiarch/qemu-user-static:register --reset --crede
 
 echo "============= Build the installer ============="
 # See github actions issue #241 comment here: https://github.com/actions/runner/issues/241#issuecomment-577360161
-script -e -c "docker run --rm -ti -v $(pwd):/construct -e GITHUB_REF -e ARCH -e COMMANDERCONDA_VERSION $DOCKERIMAGE /construct/scripts/build.sh"
+script -e -c "docker run --rm -ti -v $(pwd):/construct -e GITHUB_REF -e TARGET_PLATFORM -e ARCH -e COMMANDERCONDA_VERSION $DOCKERIMAGE /construct/scripts/build.sh"
 
 echo "============= Test the installer ============="
 for TEST_IMAGE_NAME in "ubuntu:20.04" "ubuntu:16.04" "ubuntu:18.04" "centos:7" "debian:buster" "opensuse:42.3"
diff --git a/build_CommanderConda_macOS.sh b/build_CommanderConda_macOS.sh
index 0cdb5fe..57162fd 100755
--- a/build_CommanderConda_macOS.sh
+++ b/build_CommanderConda_macOS.sh
@@ -6,26 +6,51 @@ set -o pipefail
 set -o nounset
 
 echo "Installing Miniforge3."
-chmod +x "build/miniforge/${MINIFORGE_FILE}"
-./build/miniforge/"${MINIFORGE_FILE}" -b
+chmod +x "${MINIFORGE_FILE}"
 
-echo "Configuring conda."
+echo "Shell: ${SHELL}"
+echo "Shell arch info:"
+
+lipo -info "${SHELL}"
+file "${SHELL}"
+
+echo "Working directory:"
+pwd
 
+ls -la
+ls -la build
+ls -la build/miniforge
+
+echo "\$MINIFORGE_FILE = ${MINIFORGE_FILE}"
+
+set +o errexit
 set +o nounset
 # set +o verbose
+
+lipo -info "$(which bash)"
+file "$(which bash)"
+
+arch -"$(uname -m)" bash "${MINIFORGE_FILE}" -b -p ~/conda
+
+echo "Configuring conda."
 #shellcheck disable=SC1090
-source ~/miniforge3/bin/activate root
+source ~/conda/bin/activate root
 # set -o verbose
 set -o nounset
+set -o errexit
 
 CONSTRUCT_ROOT="$(pwd)"
 export CONSTRUCT_ROOT
+export TARGET_PLATFORM
 
 echo "============= Create build directory ============="
 mkdir -p build/ || true
 chmod 777 build/
 
 echo "============= Build the installer ============="
+ls -al ~/conda/bin
+type -a constructor
+
 ./scripts/build.sh
 
 echo "============= Test the installer ============="
diff --git a/scripts/build.sh b/scripts/build.sh
index 182e00b..7f384d1 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -23,11 +23,7 @@ fi
 conda list
 
 echo "***** Make temp directory *****"
-if [[ "$(uname)" == MINGW* ]]; then
-   TEMP_DIR=$(mktemp -d --tmpdir=C:/Users/RUNNER~1/AppData/Local/Temp/);
-else
-   TEMP_DIR=$(mktemp -d);
-fi
+TEMP_DIR=$(mktemp -d);
 
 echo "***** Copy file for installer construction *****"
 cp -R CommanderConda "${TEMP_DIR}/"
@@ -35,8 +31,17 @@ cp LICENSE "${TEMP_DIR}/"
 
 ls -al "${TEMP_DIR}"
 
+MICROMAMBA_VERSION=0.23.0
+mkdir "${TEMP_DIR}/micromamba"
+pushd "${TEMP_DIR}/micromamba"
+curl -L -O "https://anaconda.org/conda-forge/micromamba/${MICROMAMBA_VERSION}/download/${TARGET_PLATFORM}/micromamba-${MICROMAMBA_VERSION}-0.tar.bz2"
+bsdtar -xf "micromamba-${MICROMAMBA_VERSION}-0.tar.bz2"
+MICROMAMBA_FILE="${PWD}/bin/micromamba"
+popd
+EXTRA_CONSTRUCTOR_ARGS+=(--conda-exe "${MICROMAMBA_FILE}" --platform "${TARGET_PLATFORM}")
+
 echo "***** Construct the installer *****"
-constructor "$TEMP_DIR/CommanderConda/" --output-dir "$TEMP_DIR"
+constructor "$TEMP_DIR/CommanderConda/" --output-dir "$TEMP_DIR" "${EXTRA_CONSTRUCTOR_ARGS[@]}"
 
 echo "***** Generate installer hash *****"
 cd "$TEMP_DIR"