diff --git a/postorius/Dockerfile b/postorius/Dockerfile
index 93eaca8..ec4f3d6 100644
--- a/postorius/Dockerfile
+++ b/postorius/Dockerfile
@@ -6,9 +6,9 @@ FROM alpine:3.20.0
 # rights for management script
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
-	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers libldap \
+	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers \
 		postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev openldap-dev cargo rust \
-	&& apk add --no-cache --virtual .mailman-rundeps bash sassc tzdata \
+	&& apk add --no-cache --virtual .mailman-rundeps bash sassc tzdata libldap \
 		postgresql-client mysql-client py3-mysqlclient curl mailcap gettext \
 		python3 py3-pip libffi libuuid pcre-dev py-cryptography \
 	&& python3 -m pip install --break-system-packages -U 'Django<4.3' pip setuptools wheel \
diff --git a/postorius/Dockerfile.dev b/postorius/Dockerfile.dev
index b80a66c..989ec98 100644
--- a/postorius/Dockerfile.dev
+++ b/postorius/Dockerfile.dev
@@ -10,9 +10,9 @@ ARG CLIENT_REF
 # rights for management script
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
-	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers libldap \
+	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers \
 		postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev git cargo rust \
-	&& apk add --no-cache --virtual .mailman-rundeps bash sassc tzdata \
+	&& apk add --no-cache --virtual .mailman-rundeps bash sassc tzdata libldap \
 		postgresql-client mysql-client py3-mysqlclient curl mailcap \
 		python3 py3-pip libffi gettext py-cryptography \
     && python3 -m pip install --break-system-packages -U pip setuptools wheel \
diff --git a/web/Dockerfile b/web/Dockerfile
index 2c2f464..37deeba 100644
--- a/web/Dockerfile
+++ b/web/Dockerfile
@@ -9,9 +9,9 @@ COPY requirements.txt /tmp/
 # rights for management script
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
-	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers libldap \
+	&& apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers \
            postgresql-dev mariadb-dev mariadb-connector-c python3-dev libffi-dev openldap-dev cargo rust \
-	&& apk add --no-cache --virtual .mailman-rundeps bash sassc tzdata \
+	&& apk add --no-cache --virtual .mailman-rundeps bash sassc tzdata libldap \
 	   postgresql-client mysql-client py3-mysqlclient curl mailcap gettext \
 	   python3 py3-pip xapian-core xapian-bindings-python3 libffi pcre-dev py-cryptography \
 	&& python3 -m pip install --break-system-packages -U 'Django<4.3' pip setuptools wheel \
diff --git a/web/Dockerfile.dev b/web/Dockerfile.dev
index 7c93f3c..b629441 100644
--- a/web/Dockerfile.dev
+++ b/web/Dockerfile.dev
@@ -11,9 +11,9 @@ ARG CLIENT_REF
 # rights for management script
 RUN --mount=type=cache,target=/root/.cache \
     set -ex \
-    && apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers git libldap \
+    && apk add --no-cache --virtual .build-deps gcc libc-dev linux-headers git \
         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 tzdata \
+    && apk add --no-cache --virtual .mailman-rundeps bash sassc pcre-dev tzdata libldap \
         python3 py3-pip postgresql-client mysql-client py3-mysqlclient \
         curl mailcap xapian-core xapian-bindings-python3 libffi gettext py-cryptography \
     && python3 -m pip install --break-system-packages -U pip setuptools wheel \