diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7fd619e..3240a80 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,6 +38,13 @@ jobs:
         run: pnpm audit --audit-level=high
         continue-on-error: true
 
+  dockerfile-check:
+    name: Dockerfile Package Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - run: bash scripts/check-dockerfiles.sh
+
   typecheck:
     name: Typecheck
     runs-on: ubuntu-latest
diff --git a/apps/planner/Dockerfile b/apps/planner/Dockerfile
index a6f8a9a..52b221d 100644
--- a/apps/planner/Dockerfile
+++ b/apps/planner/Dockerfile
@@ -11,6 +11,8 @@ COPY packages/ui/package.json packages/ui/
 COPY packages/map/package.json packages/map/
 COPY packages/gpx/package.json packages/gpx/
 COPY packages/i18n/package.json packages/i18n/
+COPY packages/api/package.json packages/api/
+COPY packages/map-core/package.json packages/map-core/
 COPY packages/db/package.json packages/db/
 COPY packages/jobs/package.json packages/jobs/
 RUN pnpm install --frozen-lockfile
diff --git a/scripts/check-dockerfiles.sh b/scripts/check-dockerfiles.sh
new file mode 100755
index 0000000..6bd6a63
--- /dev/null
+++ b/scripts/check-dockerfiles.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Verify all workspace packages are listed in Dockerfiles.
+# Run in CI to catch missing COPY lines when new packages are added.
+set -euo pipefail
+
+errors=0
+
+for pkg_json in packages/*/package.json; do
+  pkg_dir=$(dirname "$pkg_json")  # e.g. packages/jobs
+  pkg_name=$(basename "$pkg_dir")  # e.g. jobs
+
+  for dockerfile in apps/*/Dockerfile; do
+    app=$(basename "$(dirname "$dockerfile")")
+    if ! grep -q "COPY ${pkg_dir}/package.json" "$dockerfile"; then
+      echo "ERROR: $dockerfile is missing COPY for $pkg_dir/package.json"
+      errors=$((errors + 1))
+    fi
+  done
+done
+
+if [ "$errors" -gt 0 ]; then
+  echo ""
+  echo "$errors missing package(s) in Dockerfiles. Add COPY lines to the deps stage."
+  exit 1
+fi
+
+echo "All workspace packages present in all Dockerfiles."