diff --git a/.gitignore b/.gitignore
index ad2467a..288ed07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,6 +26,7 @@ package/appimage/*.AppImage
 package/appimage/src
 package/appimage/*.py
 AppDir
+*.squashfs
 doc/manual/doxygen
 doc/manual/sphinx/build/*
 doc/manual/sphinx/source/_build/*
diff --git a/package/appimage/AppImageBuilder.yml b/package/appimage/AppImageBuilder.yml
index 43e1b46..597a079 100644
--- a/package/appimage/AppImageBuilder.yml
+++ b/package/appimage/AppImageBuilder.yml
@@ -24,9 +24,8 @@ AppDir:
 
     runtime:
         env:
-            SEQUENCER_REV: '{{APP_VERSION}}'
+            TESTIUM_VERSION: '{{APP_VERSION}}'
             PYTHONPATH: $APPDIR/usr/lib/python3.11/site-packages:$APPDIR/usr/lib/python3.11
-            QT_QPA_PLATFORM: xcb
 
         path_mappings:
             - /usr/share/matplotlib/mpl-data/matplotlibrc:$APPDIR/etc/matplotlibrc
@@ -69,12 +68,13 @@ AppDir:
 
         # Set python 3.11 as default
         ln -fs python3.11 $TARGET_APPDIR/usr/bin/python3
-        # Install pip
-        if [ ! -f "get-pip.py" ]; then curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py; fi
+
+        # Bootstrap pip into the AppDir Python
+        if [ ! -f "get-pip.py" ]; then curl -sS https://bootstrap.pypa.io/get-pip.py -o get-pip.py; fi
         python3.11 get-pip.py --break-system-packages
 
         # Install application dependencies in AppDir
-        python3.11 -m pip install --break-system-packages --upgrade --isolated --no-input --ignore-installed --prefix=$TARGET_APPDIR/usr -r requirements.txt
+        python3.11 -m pip install --break-system-packages --upgrade --isolated --no-input --ignore-installed --prefix=$TARGET_APPDIR/usr -r ../../src/requirements.txt
 
         export PIP_CONFIG_FILE=$HOME/.pip/pip.conf
         python3.11 -m pip install --break-system-packages --upgrade --isolated --no-input --ignore-installed --prefix=$TARGET_APPDIR/usr ../../src/dist/testium-{{APP_VERSION}}-py3-none-any.whl
diff --git a/package/appimage/build.sh b/package/appimage/build.sh
index 54efe00..d51140c 100755
--- a/package/appimage/build.sh
+++ b/package/appimage/build.sh
@@ -1,12 +1,53 @@
-#!/usr/bin/bash
+#!/bin/bash
+# Build the testium AppImage inside a Debian container (Podman or Docker).
+# The resulting .AppImage file is written to this directory.
 
-export APP_VERSION=$(<../../src/VERSION)
+set -e
 
-appimage-builder --recipe AppImageBuilder.yml
+REPO_ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+APP_VERSION="$(<"$REPO_ROOT/src/VERSION")"
 
-RESULT=$?
-if [ -n "$1" ] && [ "$1" = "install" ]; then
-    if [ $RESULT -eq 0 ]; then
-        install -v "testium-${APP_VERSION}-x86_64.AppImage" "${HOME}/.local/bin/testium"
-    fi
+if command -v podman &>/dev/null; then
+    RUNTIME=podman
+elif command -v docker &>/dev/null; then
+    RUNTIME=docker
+else
+    echo "Error: neither podman nor docker found." >&2
+    exit 1
+fi
+echo "Using $RUNTIME — building testium $APP_VERSION AppImage..."
+
+# APPIMAGE_EXTRACT_AND_RUN=1 lets appimagetool run without FUSE in the container.
+$RUNTIME run --rm \
+    --privileged \
+    -e APPIMAGE_EXTRACT_AND_RUN=1 \
+    -v "$REPO_ROOT:/work" \
+    -w /work/package/appimage \
+    debian:bookworm bash -c "
+        set -e
+        export DEBIAN_FRONTEND=noninteractive
+
+        apt-get update -qq
+        apt-get install -y -qq \
+            python3 python3-pip python3-venv python3-build \
+            dpkg-dev fakeroot squashfs-tools wget curl file binutils \
+            libglib2.0-0 patchelf zsync > /dev/null
+
+        # Build the wheel
+        cd /work/src
+        python3 -m build --wheel --outdir dist/ > /dev/null
+        cd /work/package/appimage
+
+        # Install appimage-builder
+        pip3 install appimage-builder --quiet --break-system-packages
+
+        # Run the build
+        export APP_VERSION=$APP_VERSION
+        appimage-builder --recipe AppImageBuilder.yml --skip-test
+    "
+
+echo "Done: testium-${APP_VERSION}-x86_64.AppImage"
+
+if [ "${1}" = "install" ]; then
+    install -v "testium-${APP_VERSION}-x86_64.AppImage" "${HOME}/.local/bin/testium"
 fi
diff --git a/package/appimage/requirements.txt b/package/appimage/requirements.txt
deleted file mode 100644
index 197a428..0000000
--- a/package/appimage/requirements.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-tables
-pandas
-scapy
\ No newline at end of file