diff --git a/Dockerfile b/Dockerfile
index 57e1845..5228365 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,20 @@
-FROM python:3
-RUN git config --global user.email repo-resource@concourse-ci.org && \
-    git config --global user.name repo-resource && \
-    git config --global color.ui never
+FROM python:3-slim
+
+RUN apt update \
+ && apt install -y git procps \
+ && apt upgrade -y \
+ && apt autoremove \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN git config --global user.email repo-resource@concourse-ci.org \
+ && git config --global user.name repo-resource \
+ && git config --global color.ui never
 
 COPY ssh_config /root/.ssh/config
 
 COPY repo_resource/requirements.txt /opt/resource/requirements.txt
 RUN pip install -r opt/resource/requirements.txt
+
 COPY repo_resource/check.py /opt/resource/check
 COPY repo_resource/in_.py /opt/resource/in
 COPY repo_resource/out.py /opt/resource/out