diff --git a/Dockerfile b/Dockerfile
index 4788cba..fed4c8a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,8 +2,8 @@ FROM gitlab/gitlab-runner:latest
 
 RUN true \
     && apt-get update \
-    && apt-get upgrade \
-    && apt-get install sudo \
+    && apt-get upgrade -y \
+    && apt-get clean && apt-get purge && rm -r /var/lib/apt/lists/* \
     && true
 
 RUN true \
@@ -11,4 +11,5 @@ RUN true \
     && apt-get install -y software-properties-common \
     && apt-add-repository --yes --update ppa:ansible/ansible \
     && apt-get install -y ansible \
+    && apt-get clean && apt-get purge && rm -r /var/lib/apt/lists/* \
     && true