diff --git a/pica-dokuwiki/Dockerfile b/pica-dokuwiki/Dockerfile
index 14cc4ebe1bd8566056385e736884138e5f482867..f2b204b4620a4ac7a16166a8877544617b26b65f 100644
--- a/pica-dokuwiki/Dockerfile
+++ b/pica-dokuwiki/Dockerfile
@@ -26,7 +26,9 @@ RUN apt-get update -y && \
     rm -f dokuwiki-stable.tgz && \
     chown -R www-data . && \
     chmod +x /run.sh && \
-    sed -i "s/\${MAXSIZE}/100M/g" /etc/nginx/nginx.conf
+    sed -i "s/\${MAXSIZE}/100M/g" /etc/nginx/nginx.conf && \
+    apt-get remove wget tar && \
+    apt-get clean
 
 EXPOSE 80
 VOLUME ["/var/www/html"]