diff --git a/Containerfile b/Containerfile
index f641b3d..2f7bdf9 100644
--- a/Containerfile
+++ b/Containerfile
@@ -7,7 +7,7 @@ RUN dnf install -y \
 	openssh-clients \
 	python3-dns \
 	python3-netaddr \
-	--
+	&& dnf clean all \
 
 COPY default-realm.krb5.conf /etc/krb5.conf.d/default-realm.conf