diff --git a/docker/Dockerfile b/docker/Dockerfile
index f0a0731..2b02353 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.13 AS builder
+FROM alpine:3.15 AS builder
 
 ARG BUILD_DEPENDENCIES="build-base \
     libffi-dev \
@@ -65,12 +65,12 @@ RUN mkdir -p /app && \
     cp -r /build/configs/docker_config.py /app/configs
 
 # Build image
-FROM alpine:3.13
+FROM alpine:3.15
 
 ENV FLASK_APP=/app/powerdnsadmin/__init__.py \
     USER=pda
 
-RUN apk add --no-cache mariadb-connector-c postgresql-client py3-gunicorn py3-psycopg2 xmlsec tzdata libcap && \
+RUN apk add --no-cache mariadb-connector-c postgresql-client py3-gunicorn py3-pyldap py3-flask py3-psycopg2 xmlsec tzdata libcap && \
     addgroup -S ${USER} && \
     adduser -S -D -G ${USER} ${USER} && \
     mkdir /data && \
@@ -79,7 +79,7 @@ RUN apk add --no-cache mariadb-connector-c postgresql-client py3-gunicorn py3-ps
     apk del libcap
 
 COPY --from=builder /usr/bin/flask /usr/bin/
-COPY --from=builder /usr/lib/python3.8/site-packages /usr/lib/python3.8/site-packages/
+COPY --from=builder /usr/lib/python3.9/site-packages /usr/lib/python3.9/site-packages/
 COPY --from=builder --chown=root:${USER} /app /app/
 COPY ./docker/entrypoint.sh /usr/bin/