diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index 546eb27..c7b5b82 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -7,7 +7,9 @@ on:
     branches:
       - development
     paths:
+      - .dockerignore
       - .github/**
+      - Dockerfile
       - module/**
       - netbox-sync.py
       - requirements.txt
diff --git a/Dockerfile b/Dockerfile
index 2445d31..0852fa8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,12 +5,11 @@ COPY requirements.txt .
 ARG VENV=/opt/netbox-sync/venv
 
 # Install dependencies
-RUN apt-get update && \
-    rm -rf /var/lib/apt/lists/* && \
-    python3 -m venv $VENV && \
+RUN python3 -m venv $VENV && \
     $VENV/bin/python3 -m pip install --upgrade pip && \
     $VENV/bin/pip install -r requirements.txt && \
-    $VENV/bin/pip install --upgrade vcf-sdk && \
+    $VENV/bin/pip install vmware-vcenter==9.1.1.0 && \
+    $VENV/bin/python3 -m pip uninstall -y pip && \
     find $VENV -type d -name "__pycache__" -print0 | xargs -0 -n1 rm -rf
 
 FROM python:3.14-slim AS netbox-sync
@@ -20,16 +19,24 @@ ARG VENV=/opt/netbox-sync/venv
 # Copy installed packages
 COPY --from=builder $VENV $VENV
 
-# Add netbox-sync user
-RUN groupadd --gid 1000 netbox-sync && \
-    useradd --uid 1000 --gid netbox-sync --shell /bin/sh \
-    --no-create-home --system netbox-sync
+# Copy application files
+WORKDIR /app
+COPY . .
 
-USER netbox-sync
+# Install the security updates published since the base image was built,
+# drop pip (not needed at runtime) and add the netbox-sync user.
+# The code belongs to root and is read-only for the service user; only the
+# cache directory is writable (group 0 as well, so an arbitrary uid in group 0
+# can use it)
+RUN apt-get update && \
+    apt-get dist-upgrade -y && \
+    rm -rf /var/lib/apt/lists/* && \
+    python3 -m pip uninstall -y --root-user-action=ignore pip && \
+    groupadd --gid 1000 netbox-sync && \
+    useradd --uid 1000 --gid netbox-sync --shell /bin/sh --no-create-home --system netbox-sync && \
+    mkdir -p /app/cache && chown netbox-sync:0 /app/cache && chmod 0770 /app/cache
 
-# Prepare the application
-WORKDIR /app
-COPY --chown=netbox-sync:netbox-sync . .
+USER netbox-sync
 
 # Use virtual env packages and allow timezone setup
 ENV PATH=$VENV/bin:$PATH
diff --git a/README.md b/README.md
index 684a144..8eb9365 100644
--- a/README.md
+++ b/README.md
@@ -217,6 +217,7 @@ so switch the pull address to `ghcr.io/bb-ricardo/netbox-sync`.
 
 * The application working directory is ```/app```
 * Required to mount your ```settings.ini```
+* The NetBox cache is written to ```/app/cache```, mount a volume there to keep it between runs
 
 To build it by yourself just run:
 ```shell
@@ -225,7 +226,7 @@ docker build -t ghcr.io/bb-ricardo/netbox-sync:latest .
 
 To start the container just use:
 ```shell
-docker run --rm -it -v $(pwd)/settings.ini:/app/settings.ini ghcr.io/bb-ricardo/netbox-sync:latest
+docker run --rm -it -v $(pwd)/settings.ini:/app/settings.ini -v netbox-sync-cache:/app/cache ghcr.io/bb-ricardo/netbox-sync:latest
 ```
 
 ## Kubernetes