diff --git a/Dockerfile b/Dockerfile
index 35300df..cba46cf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,13 +4,14 @@ COPY --from=koalaman/shellcheck:v0.9.0 /bin/shellcheck /bin/
 RUN apk add --update --no-cache \
       build-base \
       gcc \
-      ruby-full \
+      ruby \
       git \
       openssh-keygen \
     && \
-    gem install mdl --no-document && \
-    pip install pre-commit && \
+    pip install --no-cache-dir pre-commit && \
+    gem install --no-document mdl && \
     mkdir /data && \
-    git config --global --add safe.directory /data
+    adduser -D -g user user
 
+USER user:user
 WORKDIR /data