diff --git a/Dockerfile b/Dockerfile
index e27d457..cc9e1d4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
 #Dockerfile for a Postfix email relay service
-FROM alpine:3.12
+FROM alpine:3.13
 MAINTAINER Juan Luis Baptiste juan.baptiste@gmail.com
 
 RUN apk update && \
-    apk add bash gawk cyrus-sasl cyrus-sasl-plain cyrus-sasl-login cyrus-sasl-crammd5 mailx \
+    apk add bash gawk cyrus-sasl cyrus-sasl-login cyrus-sasl-crammd5 mailx \
     perl supervisor postfix rsyslog && \
     rm -rf /var/cache/apk/* && \
     mkdir -p /var/log/supervisor/ /var/run/supervisor/ && \
diff --git a/run.sh b/run.sh
index fa4e8b9..659cb27 100644
--- a/run.sh
+++ b/run.sh
@@ -34,7 +34,7 @@ add_config_value "myorigin" '$mydomain'
 add_config_value "relayhost" "[${SMTP_SERVER}]:${SMTP_PORT}"
 add_config_value "smtp_use_tls" "yes"
 add_config_value "smtp_sasl_auth_enable" "yes"
-add_config_value "smtp_sasl_password_maps" "hash:/etc/postfix/sasl_passwd"
+add_config_value "smtp_sasl_password_maps" "lmdb:/etc/postfix/sasl_passwd"
 add_config_value "smtp_sasl_security_options" "noanonymous"
 add_config_value "always_add_missing_headers" "${ALWAYS_ADD_MISSING_HEADERS:-no}"