diff --git a/Dockerfile b/Dockerfile
index 4b38d05..83f8b27 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # Local dev image (docker-compose). Installs the full requirements.txt,
 # including test deps, which the slim Dockerfile.web deliberately omits.
 # Keep the base in sync with Dockerfile.web/.worker/.beat and CI (3.11).
-FROM python:3.11-slim-bookworm
+FROM python:3.14-slim-bookworm
 
 # Set environment variables
 ENV PYTHONDONTWRITEBYTECODE=1
diff --git a/Dockerfile.beat b/Dockerfile.beat
index 23bf455..8fb7c46 100644
--- a/Dockerfile.beat
+++ b/Dockerfile.beat
@@ -5,7 +5,7 @@
 #
 # Issue #5 (ML Monitoring): beat fires `analyzer.tasks.monitor_ml_models`
 # every 15 min; see `querygrade/celery.py:beat_schedule`.
-FROM python:3.11-slim-bookworm
+FROM python:3.14-slim-bookworm
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
diff --git a/Dockerfile.web b/Dockerfile.web
index e26d7a3..df627c9 100644
--- a/Dockerfile.web
+++ b/Dockerfile.web
@@ -1,5 +1,5 @@
 # Slim web image for Railway. ML deps live in Dockerfile.worker.
-FROM python:3.11-slim-bookworm
+FROM python:3.14-slim-bookworm
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
diff --git a/Dockerfile.worker b/Dockerfile.worker
index f47fc7d..285d46d 100644
--- a/Dockerfile.worker
+++ b/Dockerfile.worker
@@ -1,5 +1,5 @@
 # Full Celery worker image with ML stack. Used by the Railway worker service.
-FROM python:3.11-slim-bookworm
+FROM python:3.14-slim-bookworm
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \