diff --git a/.gitea/workflows/backend-quality-gate.yml b/.gitea/workflows/backend-quality-gate.yml
index 019a2bdd..92da8401 100644
--- a/.gitea/workflows/backend-quality-gate.yml
+++ b/.gitea/workflows/backend-quality-gate.yml
@@ -57,24 +57,14 @@ jobs:
           docker version
 
       - name: Install and verify Docker Compose v2
-        env:
-          DOCKER_COMPOSE_VERSION: v2.39.1
         run: |
           set -euo pipefail
-          case "$(uname -m)" in
-            x86_64) compose_arch=x86_64; compose_sha=a5ea28722d5da628b59226626f7d6c33c89a7ed19e39f750645925242044c9d2 ;;
-            aarch64|arm64) compose_arch=aarch64; compose_sha=7b2627ed76f7dcb0d93f649f185af912372229b4c09762a3cd1db5be5255632b ;;
-            *) echo "Unsupported Docker Compose architecture: $(uname -m)" >&2; exit 1 ;;
-          esac
-          compose_dir="${DOCKER_CONFIG:-$HOME/.docker}/cli-plugins"
-          compose_bin="$compose_dir/docker-compose"
-          mkdir -p "$compose_dir"
-          curl -fsSL --retry 3 --retry-all-errors --retry-delay 10 \
-            --connect-timeout 15 --max-time 180 \
-            "https://github.com/docker/compose/releases/download/$DOCKER_COMPOSE_VERSION/docker-compose-linux-$compose_arch" \
-            -o "$compose_bin"
-          printf '%s  %s\n' "$compose_sha" "$compose_bin" | sha256sum -c -
-          chmod +x "$compose_bin"
+          if ! docker compose version --short 2>/dev/null | grep -Eq '^v?2\.'; then
+            apt-get -o Acquire::Retries=3 -o Acquire::http::Timeout=30 \
+              -o Acquire::https::Timeout=30 update
+            DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+              docker-compose-v2
+          fi
           docker compose version
           docker compose version --short | grep -Eq '^v?2\.'
           docker compose --help | grep -q -- '--project-name'
diff --git a/frontend/tests/staging-backend-workflows.test.ts b/frontend/tests/staging-backend-workflows.test.ts
index a9afa28e..44a77927 100644
--- a/frontend/tests/staging-backend-workflows.test.ts
+++ b/frontend/tests/staging-backend-workflows.test.ts
@@ -131,11 +131,8 @@ test("Gitea quality gate validates before publishing an immutable ACR manifest",
   assert.equal((workflow.match(/git status --porcelain --untracked-files=all/g) ?? []).length, 2);
   assert.match(workflow, /python3 -m venv \.venv/);
   assert.match(workflow, /python -m playwright install --with-deps chromium/);
-  assert.match(workflow, /DOCKER_COMPOSE_VERSION: v2\.39\.1/);
-  assert.match(workflow, /docker-compose-linux-\$compose_arch/);
-  assert.match(workflow, /curl -fsSL --retry 3 --retry-all-errors --retry-delay 10/);
-  assert.match(workflow, /--connect-timeout 15 --max-time 180/);
-  assert.match(workflow, /sha256sum -c -/);
+  assert.match(workflow, /apt-get[\s\S]*Acquire::Retries=3[\s\S]*update/);
+  assert.match(workflow, /apt-get install -y --no-install-recommends[\s\S]*docker-compose-v2/);
   assert.match(workflow, /docker compose version --short/);
   assert.match(workflow, /docker compose --help \| grep -q -- '--project-name'/);
   assert.match(