diff --git a/core/Dockerfile.dev b/core/Dockerfile.dev
index 20a391f..66eb78a 100644
--- a/core/Dockerfile.dev
+++ b/core/Dockerfile.dev
@@ -15,7 +15,7 @@ RUN --mount=type=cache,target=/root/.cache \
     apk update \
 	&& apk add --no-cache --virtual build-deps gcc python3-dev musl-dev \
    	    postgresql-dev git libffi-dev  \
-    && apk add --no-cache bash su-exec postgresql-client mysql-client curl python3 py3-pip linux-headers \
+    && apk add --no-cache bash su-exec postgresql-client mysql-client curl python3 py3-pip linux-headers mariadb-connector-c \
     && python3 -m pip install -U psycopg2 pymysql setuptools wheel \
     && python3 -m pip install \
         git+https://gitlab.com/mailman/mailman@${CORE_REF} \
diff --git a/postorius/Dockerfile b/postorius/Dockerfile
index f8d719b..2d235b4 100644
--- a/postorius/Dockerfile
+++ b/postorius/Dockerfile
@@ -12,7 +12,7 @@ COPY docker-entrypoint.sh /usr/local/bin/
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
 	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers \
-		postgresql-dev mariadb-dev python3-dev libffi-dev openldap-dev cargo rust \
+		postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev openldap-dev cargo rust \
 	&& apk add --no-cache --virtual .mailman-rundeps bash sassc \
 		postgresql-client mysql-client py3-mysqlclient curl mailcap gettext \
 		python3 py3-pip libffi libuuid pcre-dev \
diff --git a/postorius/Dockerfile.dev b/postorius/Dockerfile.dev
index f1560cb..f6bf5fa 100644
--- a/postorius/Dockerfile.dev
+++ b/postorius/Dockerfile.dev
@@ -16,7 +16,7 @@ ARG CLIENT_REF
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
 	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers \
-		postgresql-dev mariadb-dev python3-dev libffi-dev git cargo rust \
+		postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev git cargo rust \
 	&& apk add --no-cache --virtual .mailman-rundeps bash sassc \
 		postgresql-client mysql-client py3-mysqlclient curl mailcap \
 		python3 py3-pip libffi gettext \
diff --git a/postorius/docker-entrypoint.sh b/postorius/docker-entrypoint.sh
index 26c7e38..2b8218b 100755
--- a/postorius/docker-entrypoint.sh
+++ b/postorius/docker-entrypoint.sh
@@ -16,23 +16,14 @@ function wait_for_postgres () {
 
 function wait_for_mysql () {
 	# Check if MySQL is up and accepting connections.
-	HOSTNAME=$(python3 <<EOF
-try:
-    from urllib.parse import urlparse
-except ImportError:
-    from urlparse import urlparse
-o = urlparse('$DATABASE_URL')
-print(o.hostname)
-EOF
-)
-	until mysqladmin ping --host "$HOSTNAME" --silent; do
+	readarray -d' ' -t ENDPOINT <<< $(python3 -c "from urllib.parse import urlparse; o = urlparse('$DATABASE_URL'); print('%s %s' % (o.hostname, o.port if o.port else '3306'));")
+	until mysqladmin ping --host ${ENDPOINT[0]} --port ${ENDPOINT[1]} --silent; do
 		>&2 echo "MySQL is unavailable - sleeping"
 		sleep 1
 	done
 	>&2 echo "MySQL is up - continuing"
 }
 
-
 function check_or_create () {
 	# Check if the path exists, if not, create the directory.
 	if [[ ! -e dir ]]; then
diff --git a/web/Dockerfile b/web/Dockerfile
index 011b4c5..ff3cf59 100644
--- a/web/Dockerfile
+++ b/web/Dockerfile
@@ -12,7 +12,7 @@ COPY docker-entrypoint.sh /usr/local/bin/
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
 	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers \
-           postgresql-dev mariadb-dev python3-dev libffi-dev openldap-dev cargo rust \
+           postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev openldap-dev cargo rust \
 	&& apk add --no-cache --virtual .mailman-rundeps bash sassc \
 	   postgresql-client mysql-client py3-mysqlclient curl mailcap gettext \
 	   python3 py3-pip xapian-core xapian-bindings-python3 libffi pcre-dev \
diff --git a/web/Dockerfile.dev b/web/Dockerfile.dev
index 2c5951c..426e195 100644
--- a/web/Dockerfile.dev
+++ b/web/Dockerfile.dev
@@ -17,7 +17,7 @@ ARG CLIENT_REF
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
     && apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers git \
-        postgresql-dev mariadb-dev python3-dev libffi-dev openldap-dev cargo rust \
+        postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev openldap-dev cargo rust \
     && apk add --no-cache --virtual .mailman-rundeps bash sassc pcre-dev \
         python3 py3-pip postgresql-client mysql-client py3-mysqlclient \
         curl mailcap xapian-core xapian-bindings-python3 libffi gettext \
diff --git a/web/docker-entrypoint.sh b/web/docker-entrypoint.sh
index a02691c..a29c396 100755
--- a/web/docker-entrypoint.sh
+++ b/web/docker-entrypoint.sh
@@ -16,23 +16,14 @@ function wait_for_postgres () {
 
 function wait_for_mysql () {
 	# Check if MySQL is up and accepting connections.
-	HOSTNAME=$(python3 <<EOF
-try:
-    from urllib.parse import urlparse
-except ImportError:
-    from urlparse import urlparse
-o = urlparse('$DATABASE_URL')
-print(o.hostname)
-EOF
-)
-	until mysqladmin ping --host "$HOSTNAME" --silent; do
+	readarray -d' ' -t ENDPOINT <<< $(python3 -c "from urllib.parse import urlparse; o = urlparse('$DATABASE_URL'); print('%s %s' % (o.hostname, o.port if o.port else '3306'));")
+	until mysqladmin ping --host ${ENDPOINT[0]} --port ${ENDPOINT[1]} --silent; do
 		>&2 echo "MySQL is unavailable - sleeping"
 		sleep 1
 	done
 	>&2 echo "MySQL is up - continuing"
 }
 
-
 function check_or_create () {
 	# Check if the path exists, if not, create the directory.
 	if [[ ! -e dir ]]; then