diff --git a/Dockerfile b/Dockerfile
index 4b1b203..6122a59 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM registry.fedoraproject.org/fedora:26
+FROM baseruntime/baseruntime:latest
 
 ENV POSTFIX_SMTP_PORT=10025  NAME=postfix ARCH=x86_64
 LABEL MAINTAINER "Petr Hracek" <phracek@redhat.com>
@@ -16,8 +16,10 @@ LABEL   summary="Postfix is a Mail Transport Agent (MTA)." \
         io.openshift.expose-services="10025:postfix" \
         io.openshift.tags="postfix,mail,mta"
 
-RUN dnf install -y --setopt=tsflags=nodocs postfix findutils && \
-    dnf -y clean all
+COPY repos/* /etc/yum.repos.d/
+RUN microdnf --nodocs --enablerepo fedora install findutils && \
+    microdnf --nodocs --enablerepo postfix install postfix && \
+    microdnf -y clean all
 
 ADD files /files
 ADD README.md /
diff --git a/repos/fedora.repo b/repos/fedora.repo
new file mode 100644
index 0000000..3404240
--- /dev/null
+++ b/repos/fedora.repo
@@ -0,0 +1,4 @@
+[fedora]
+name=fedora
+baseurl=https://mirrors.nic.cz/fedora/linux/development/26/Everything/x86_64/os/
+enabled=0
diff --git a/repos/perl.repo b/repos/perl.repo
new file mode 100644
index 0000000..63394b1
--- /dev/null
+++ b/repos/perl.repo
@@ -0,0 +1,4 @@
+[perl]
+name=perl
+baseurl=https://kojipkgs.fedoraproject.org/repos/module-fcd86adc7a9c7e0a/latest/x86_64/
+enabled=0
diff --git a/repos/postfix.repo b/repos/postfix.repo
new file mode 100644
index 0000000..1521efc
--- /dev/null
+++ b/repos/postfix.repo
@@ -0,0 +1,4 @@
+[postfix]
+name=postfix
+baseurl=https://kojipkgs.stg.fedoraproject.org/compose/branched/jkaluza/latest-Fedora-Modular-26/compose/Server/x86_64/os/
+enabled=0