diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 921ef7b..ab629e6 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -1,13 +1,14 @@
 name: build releases
 
 on:
+  workflow_dispatch:
   release:
     types: [published]
 
 jobs:
 
   build:
-    runs-on: ubuntu-latest
+    runs-on: macos-latest
     steps:
     - uses: actions/checkout@v2
 
@@ -18,3 +19,8 @@ jobs:
 
     - name: build binaries
       run: GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }} ./build.sh
+      env:
+        AC_USERNAME: ${{ secrets.AC_USERNAME }}
+        AC_PASSWORD: ${{ secrets.AC_PASSWORD }}
+        APPLE_DEVELOPER_CERTIFICATE_P12_BASE64: ${{ secrets.APPLE_DEVELOPER_CERTIFICATE_P12_BASE64 }}
+        APPLE_DEVELOPER_CERTIFICATE_PASSWORD: ${{ secrets.APPLE_DEVELOPER_CERTIFICATE_PASSWORD }}
diff --git a/amd64-darwin-sb-gon-config.json b/amd64-darwin-sb-gon-config.json
new file mode 100644
index 0000000..3474e08
--- /dev/null
+++ b/amd64-darwin-sb-gon-config.json
@@ -0,0 +1,11 @@
+{
+    "source" : ["./amd64-darwin-sb"],
+    "bundle_id" : "com.sparkbox.sb",
+    "sign" :{
+        "application_identity" : "Developer ID Application: Rob Harr (J77MB48G77)"
+    },
+    "dmg" :{
+        "output_path" : "./amd64-darwin-sb.dmg",
+        "volume_name" : "amd64-sb"
+    }
+}
diff --git a/arm64-darwin-sb-gon-config.json b/arm64-darwin-sb-gon-config.json
new file mode 100644
index 0000000..64164b4
--- /dev/null
+++ b/arm64-darwin-sb-gon-config.json
@@ -0,0 +1,11 @@
+{
+    "source" : ["./arm64-darwin-sb"],
+    "bundle_id" : "com.sparkbox.sb",
+    "sign" :{
+        "application_identity" : "Developer ID Application: Rob Harr (J77MB48G77)"
+    },
+    "dmg" :{
+        "output_path" : "./arm64-darwin-sb.dmg",
+        "volume_name" : "arm-sb"
+    }
+}
diff --git a/build.sh b/build.sh
index ebbfcb9..058992b 100755
--- a/build.sh
+++ b/build.sh
@@ -4,24 +4,55 @@
 # https://docs.github.com/en/actions/reference/environment-variables#default-environment-variables
 GIT_TAG=$(jq .release.tag_name < "${GITHUB_EVENT_PATH}" | sed -e 's/"//g')
 UPLOAD_URL=$(jq .release.upload_url < "${GITHUB_EVENT_PATH}" | sed -e 's/"//g' | cut -d "{" -f 1)
+CERT_FILE="${HOME}/developer_id_certificate.p12"
 RELEASES="arm64-darwin-sb amd64-linux-sb amd64-darwin-sb"
 
 upload_file() {
     NAME=$1
 
-    zip "${NAME}.zip" "${NAME}"
+    if [ "${NAME}" = "amd64-linux-sb" ]; then
+        zip "${NAME}.zip" "${NAME}"
+        NAME="${NAME}.zip"
+    else
+        NAME="${NAME}.dmg"
+    fi
+
     curl -H "Accept: application/vnd.github.v3+json" \
          -H "Authorization: Bearer ${GITHUB_TOKEN}" \
          -H "Content-Type: application/zip" \
-         --data-binary "@${NAME}.zip" \
-         "${UPLOAD_URL}?name=${NAME}.zip"
+         --data-binary "@${NAME}" \
+         "${UPLOAD_URL}?name=${NAME}"
 }
 
+setup_keychain() {
+  echo "${APPLE_DEVELOPER_CERTIFICATE_P12_BASE64}" | base64 --decode > "${CERT_FILE}"
+  EPHEMERAL_KEYCHAIN="ci-ephemeral-keychain"
+  EPHEMERAL_KEYCHAIN_PASSWORD="$(openssl rand -base64 100)"
+  security create-keychain -p "${EPHEMERAL_KEYCHAIN_PASSWORD}" "${EPHEMERAL_KEYCHAIN}"
+  EPHEMERAL_KEYCHAIN_FULL_PATH="${HOME}/Library/Keychains/${EPHEMERAL_KEYCHAIN}-db"
+  security import "${CERT_FILE}" -k "${EPHEMERAL_KEYCHAIN_FULL_PATH}" -P "${APPLE_DEVELOPER_CERTIFICATE_PASSWORD}" -T "$(command -v codesign)"
+  security set-key-partition-list -S "apple-tool:,apple:" -s -k "${EPHEMERAL_KEYCHAIN_PASSWORD}" "${EPHEMERAL_KEYCHAIN_FULL_PATH}"
+  security default-keychain -d "user" -s "${EPHEMERAL_KEYCHAIN_FULL_PATH}"
+}
+
+sign() {
+  PLATFORM=$1
+  gon -log-json -log-level=info "./${PLATFORM}-gon-config.json"
+}
+
+setup_keychain
+brew tap mitchellh/gon
+brew install mitchellh/gon/gon
+
 for PLATFORM in ${RELEASES}; do
     GOOS=$(echo "${PLATFORM}" | cut -d - -f 2) \
     GOARCH=$(echo "${PLATFORM}" | cut -d - -f 1) \
     go build -o "${PLATFORM}" -a -ldflags="-X 'sb/cmd.AppVersion=${GIT_TAG}'"
 
+    if [ "${PLATFORM}" != "amd64-linux-sb" ]; then
+        sign "${PLATFORM}"
+    fi
+
     if [ "${UPLOAD_URL}" != null ]; then
         upload_file "${PLATFORM}"
     fi