diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 7f22f30..9ad6329 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -25,7 +25,7 @@ jobs:
           python -m pip install -U --upgrade-strategy=eager -r requirements.txt
       - name: Build
         run: |
-          SOURCE_DATE_EPOCH=$(git show -s --format=%ct) ./build.sh "" "" master
+          SOURCE_DATE_EPOCH=$(git show -s --format=%ct) ./build.sh --gitref=master
       - name: Get file name
         id: vars
         run: |
diff --git a/README.md b/README.md
index 16060cc..7dde678 100644
--- a/README.md
+++ b/README.md
@@ -59,10 +59,10 @@ Supported architectures: `x86_64`, `aarch64`
 
 ```bash
 # Build
-./build.sh [$ARCH] [$GITREPO] [$GITREF]
+./build.sh [--arch=$ARCH] [--gitrepo=$GITREPO] [--gitref=$GITREF]
 
 # Get new list of Python dependencies (for updating config.yml)
-./get-dependencies.sh [$ARCH] [$GITREPO] [$GITREF] [$OPT_DEPS]
+./get-dependencies.sh [--arch=$ARCH] [--gitrepo=$GITREPO] [--gitref=$GITREF] [depspec...]
 ```
 
 The AppImages are reproducible when `SOURCE_DATE_EPOCH` is set:
diff --git a/build.sh b/build.sh
index b0f4eb3..010095d 100755
--- a/build.sh
+++ b/build.sh
@@ -3,9 +3,9 @@
 
 set -euo pipefail
 
-ARCH="${1:-$(uname -m)}"
-GITREPO="${2:-}"
-GITREF="${3:-}"
+ARCH="$(uname -m)"
+GITREPO=""
+GITREF=""
 
 ROOT=$(git rev-parse --show-toplevel 2>/dev/null || dirname "$(readlink -f "${0}")")
 CONFIG="${ROOT}/config.yml"
@@ -20,6 +20,10 @@ declare -A DEPS=(
   [docker]=docker
 )
 
+_OPTS=$(getopt --name "$0" --long 'help,arch:,gitrepo:,gitref:' --options 'help,a:' -- "$@")
+eval set -- "${_OPTS}"
+unset _OPTS
+
 
 # ----
 
@@ -33,6 +37,50 @@ err() {
   exit 1
 }
 
+print_help() {
+  echo "Usage: ${0} [options]"
+  echo
+  echo "Options:"
+  echo "  -a, --arch <arch>    Target architecture"
+  echo "      --gitrepo <url>  Source"
+  echo "      --gitref <ref>   Git branch/tag/commit"
+  exit 0
+}
+
+
+# ----
+
+
+while true; do
+  case "${1}" in
+    -h | --help)
+      print_help
+      ;;
+    -a | --arch)
+      ARCH="${2}"
+      shift 2
+      ;;
+    --gitrepo)
+      GITREPO="${2}"
+      shift 2
+      ;;
+    --gitref)
+      GITREF="${2}"
+      shift 2
+      ;;
+    --)
+      shift
+      break
+      ;;
+    *)
+      err "Invalid option: ${1}"
+      ;;
+  esac
+done
+
+
+# ----
+
 
 for dep in "${!DEPS[@]}"; do
   command -v "${dep}" >/dev/null 2>&1 || err "Missing dependency: ${DEPS["${dep}"]}"
diff --git a/get-dependencies.sh b/get-dependencies.sh
index c82a3d0..c660cca 100755
--- a/get-dependencies.sh
+++ b/get-dependencies.sh
@@ -3,11 +3,10 @@
 
 set -euo pipefail
 
-ARCH="${1:-$(uname -m)}"
-GITREPO="${2:-}"
-GITREF="${3:-}"
-OPT_DEPSPEC=("${@}")
-OPT_DEPSPEC=("${OPT_DEPSPEC[@]:3}")
+ARCH="$(uname -m)"
+GITREPO=""
+GITREF=""
+OPT_DEPSPEC=()
 
 ROOT=$(git rev-parse --show-toplevel 2>/dev/null || dirname "$(readlink -f "${0}")")
 CONFIG="${ROOT}/config.yml"
@@ -18,6 +17,10 @@ declare -A DEPS=(
   [docker]=docker
 )
 
+_OPTS=$(getopt --name "$0" --long 'help,arch:,gitrepo:,gitref:' --options 'help,a:' -- "$@")
+eval set -- "${_OPTS}"
+unset _OPTS
+
 
 # ----
 
@@ -31,6 +34,52 @@ err() {
   exit 1
 }
 
+print_help() {
+  echo "Usage: ${0} [options] [depspec]"
+  echo
+  echo "Options:"
+  echo "  -a, --arch <arch>    Target architecture"
+  echo "      --gitrepo <url>  Source"
+  echo "      --gitref <ref>   Git branch/tag/commit"
+  exit 0
+}
+
+
+# ----
+
+
+while true; do
+  case "${1}" in
+    -h | --help)
+      print_help
+      ;;
+    -a | --arch)
+      ARCH="${2}"
+      shift 2
+      ;;
+    --gitrepo)
+      GITREPO="${2}"
+      shift 2
+      ;;
+    --gitref)
+      GITREF="${2}"
+      shift 2
+      ;;
+    --)
+      shift
+      break
+      ;;
+    *)
+      err "Invalid option: ${1}"
+      ;;
+  esac
+done
+
+OPT_DEPSPEC+=("${@}")
+
+
+# ----
+
 
 for dep in "${!DEPS[@]}"; do
   command -v "${dep}" >/dev/null 2>&1 || err "Missing dependency: ${DEPS["${dep}"]}"