diff --git a/Dockerfiles/ubuntu-24.04.dockerfile b/Dockerfiles/ubuntu-24.04.dockerfile
index 749ccdb..d6b7229 100644
--- a/Dockerfiles/ubuntu-24.04.dockerfile
+++ b/Dockerfiles/ubuntu-24.04.dockerfile
@@ -53,7 +53,7 @@ ENV VIRTUAL_ENV=/opt/venv
 RUN python3 -m venv $VIRTUAL_ENV
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 RUN python3 -m pip install --upgrade pip setuptools wheel \
- && python3 -m pip install gnureadline boto3 pyyaml pytz minio requests clingo \
+ && python3 -m pip install gnureadline boto3 pyyaml pytz minio requests \
  && rm -rf ~/.cache
 
 # Install AWS CLI v2 (used improve performance of `spack buildcache update-index`).
@@ -78,6 +78,11 @@ RUN AWSCLI_ZIP="awscli-exe-linux-$(uname -m).zip" \
   && rm -rf /tmp/awscliv2.zip /tmp/awscliv2.zip.sig /tmp/aws "$GNUPGHOME" \
   && aws --version
 
+# Spack's optimized clingo (faster than the PyPI wheel); SPACK_COMMIT is v1.2.2.
+ARG SPACK_COMMIT=3e19345b6e12f5ff1b874f4059622fc6a1fd804a
+COPY scripts/bootstrap-clingo.sh /tmp/bootstrap-clingo.sh
+RUN /tmp/bootstrap-clingo.sh "${SPACK_COMMIT}" && rm /tmp/bootstrap-clingo.sh
+
 CMD ["/bin/bash"]
 
 ENV NVIDIA_VISIBLE_DEVICES=all \
diff --git a/scripts/bootstrap-clingo.sh b/scripts/bootstrap-clingo.sh
new file mode 100755
index 0000000..fcbbe1e
--- /dev/null
+++ b/scripts/bootstrap-clingo.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+# Install Spack's optimized clingo and make it importable by python3.
+# Usage: bootstrap-clingo.sh <spack-commit> [bootstrap-root]
+set -eu
+
+SPACK_COMMIT="${1:?usage: bootstrap-clingo.sh <spack-commit> [bootstrap-root]}"
+ROOT_ARG="${2:-/opt/spack-bootstrap}"
+
+# Spack skips bootstrapping if python3 can already import clingo.
+if CLINGO_FILE=$(python3 -c 'import clingo; print(clingo.__file__)' 2>/dev/null); then
+  echo "error: python3 already imports clingo from $CLINGO_FILE; remove it first" >&2
+  exit 1
+fi
+
+# Spack would reuse a clingo already in the store instead of SPACK_COMMIT's.
+if [ -e "$ROOT_ARG/store" ]; then
+  echo "error: $ROOT_ARG/store already exists; use an empty bootstrap root" >&2
+  exit 1
+fi
+
+# Absolute path, since it ends up in the .pth.
+BOOTSTRAP_ROOT=$(mkdir -p "$ROOT_ARG" && CDPATH= cd "$ROOT_ARG" && pwd -P)
+# site, not sysconfig: Debian's sysconfig purelib isn't on sys.path before Python 3.10.
+SITE_DIR=$(python3 -c 'import site; print(site.getsitepackages()[0])')
+SPACK_DIR="$(mktemp -d)"
+trap 'rm -rf "$SPACK_DIR"' EXIT
+
+# Throwaway Spack; the commit only picks which clingo build is installed.
+git init -q "$SPACK_DIR"
+git -C "$SPACK_DIR" fetch -q --depth 1 https://github.com/spack/spack.git "$SPACK_COMMIT"
+git -C "$SPACK_DIR" checkout -q FETCH_HEAD
+export SPACK_USER_CONFIG_PATH="$SPACK_DIR/.user" SPACK_USER_CACHE_PATH="$SPACK_DIR/.user"
+"$SPACK_DIR/bin/spack" bootstrap root --scope site "$BOOTSTRAP_ROOT"
+"$SPACK_DIR/bin/spack" bootstrap disable --scope site spack-install
+"$SPACK_DIR/bin/spack" bootstrap now
+
+# The store started empty, so any match is the clingo just installed.
+PY_TAG=$(python3 -c 'import sys; print("cpython-%d%d" % sys.version_info[:2])')
+CLINGO_SO=$(find "$BOOTSTRAP_ROOT/store" -name "clingo.${PY_TAG}-*.so")
+echo "clingo builds matching ${PY_TAG}: ${CLINGO_SO:-none}"
+test -n "$CLINGO_SO"
+
+mkdir -p "$SITE_DIR"
+dirname "$CLINGO_SO" > "$SITE_DIR/spack-clingo.pth"
+
+python3 -c 'import clingo; print("clingo", clingo.__version__, "from", clingo.__file__)'