diff --git a/Dockerfile b/Dockerfile
index 3a0a053..ae72b07 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,8 +4,10 @@ LABEL maintainer="source@kingsquare.nl"
 
 RUN set -ex; \
     \
-    DEBIAN_FRONTEND=noninteractive apt -yq update && \
-    DEBIAN_FRONTEND=noninteractive apt -yq install \
+    #https://github.com/hackafake/hackafake-backend/issues/32#issuecomment-735602580
+    #https://exerror.com/repository-http-deb-debian-org-debian-buster-updates-inrelease-changed-its-suite-value-from-stable-updates-to-oldstable-updates/
+    DEBIAN_FRONTEND=noninteractive apt-get -yq --allow-releaseinfo-change update && \
+    DEBIAN_FRONTEND=noninteractive apt-get -yq install \
         supervisor \
         ca-certificates \
         openssl \
@@ -19,8 +21,8 @@ RUN set -ex; \
         pfqueue \
         procps \
     && \
-    apt -yq autoremove && \
-    apt -yq clean && \
+    apt-get -yq autoremove && \
+    apt-get -yq clean && \
     rm -rf /var/log/{apt/*,dpkg.log,alternatives.log} && \
     rm -rf /var/log/apt/* && \
     rm -rf /var/apt/lists/* && \
diff --git a/README.md b/README.md
index d429ed8..575e5f5 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ Build local image from repo
         -p 587:587 \
         -e maildomain=mail.example.com \
         -e smtp_user=user:pwd \
-        -e dkimselector=mail \
+        -e dkimselector=default \
         -v /path/to/domainkeys:/etc/opendkim/domainkeys \
         --name postfix \
         -d kingsquare/postfix
@@ -74,7 +74,7 @@ Build local image from repo
 	    -p 587:587 \
         -e maildomain=mail.example.com \
         -e smtp_user=user:pwd \
-        -e dkimselector=mail \
+        -e dkimselector=default \
         -v /path/to/etc/opendkim:/etc/opendkim \
         --name postfix \
         -d kingsquare/postfix
diff --git a/src/bin/setup-opendkim.sh b/src/bin/setup-opendkim.sh
index fd81593..e5662fb 100755
--- a/src/bin/setup-opendkim.sh
+++ b/src/bin/setup-opendkim.sh
@@ -27,7 +27,7 @@ Canonicalization        relaxed/simple
 
 ExternalIgnoreList      refile:/etc/opendkim/TrustedHosts
 InternalHosts           refile:/etc/opendkim/TrustedHosts
-KeyTable                refile:/etc/opendkim/KeyTable
+KeyTable                /etc/opendkim/KeyTable
 SigningTable            refile:/etc/opendkim/SigningTable
 
 Mode                    sv
@@ -62,7 +62,7 @@ $maildomain
 *.$maildomain
 EOF
 cat >>/etc/opendkim/KeyTable <<EOF
-${dkimselector:-default}._domainkey.$maildomain $maildomain:${dkimselector:-mail}:$(find /etc/opendkim/domainkeys -iname *.private)
+${dkimselector:-default}._domainkey.$maildomain $maildomain:${dkimselector:-default}:$(find /etc/opendkim/domainkeys -iname *.private)
 EOF
 cat >>/etc/opendkim/SigningTable <<EOF
 *@$maildomain ${dkimselector:-default}._domainkey.$maildomain