diff --git a/debian/Dockerfile b/debian/Dockerfile
index 03612064f6ff96e2267be80faa214c66e30ced63..0aac4a82b91025aae04f1ba4e460af35176ab3e1 100644
--- a/debian/Dockerfile
+++ b/debian/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:12.16.0
+FROM node:12.16.0-slim
 
 # Build arguments to change source url, branch or tag
 ARG CODIMD_REPOSITORY=https://github.com/codimd/server.git
@@ -10,6 +10,12 @@ ARG DEBIAN_FRONTEND=noninteractive
 ENV DOCKERIZE_VERSION=v0.6.1
 ENV NODE_ENV=production
 
+RUN apt-get update && \
+    apt-get install --no-install-recommends -y \
+      ca-certificates \
+      wget && \
+    rm -r /var/lib/apt/lists/*
+
 RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz && \
     tar -C /usr/local/bin -xzvf dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz && \
     rm dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz
@@ -17,19 +23,25 @@ RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSI
 ENV GOSU_VERSION 1.11
 COPY ["resources/gosu-gpg.key", "/tmp/gosu.key"]
 RUN set -ex; \
+    apt-get update && \
+    apt-get install --no-install-recommends -qy \
+      gpg && \
     dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
     wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
     wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
-    \
+
 # verify the signature
     export GNUPGHOME="$(mktemp -d)"; \
     gpg --no-tty --import /tmp/gosu.key; \
     gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
     rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
-    \
+
     chmod +x /usr/local/bin/gosu; \
 # verify that the binary works
-    gosu nobody true
+    gosu nobody true && \
+    apt-get autoremove --purge -qy \
+      gpg && \
+    rm -r /var/lib/apt/lists/*
 
 # Add configuraton files
 COPY ["resources/config.json", "resources/.sequelizerc", "/files/"]