diff --git a/web/Dockerfile b/web/Dockerfile
index 4d661f7..eb29a3c 100644
--- a/web/Dockerfile
+++ b/web/Dockerfile
@@ -12,10 +12,10 @@ COPY docker-entrypoint.sh /usr/local/bin/
 # rights for management script
 RUN 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 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 \
+	   python3 py3-pip xapian-core xapian-bindings-python3 libffi pcre-dev \
 	&& python3 -m pip install -U 'Django<3.0' pip setuptools wheel \
 	&& pip install mailmanclient==3.3.2 \
 		postorius==1.3.4 \
diff --git a/web/Dockerfile.dev b/web/Dockerfile.dev
index 77b37bc..d4f7f3f 100644
--- a/web/Dockerfile.dev
+++ b/web/Dockerfile.dev
@@ -18,8 +18,8 @@ ARG CLIENT_REF
 RUN 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 \
-    && apk add --no-cache --virtual .mailman-rundeps bash sassc \
-      python3 py3-pip postgresql-client mysql-client py3-mysqlclient \
+    && 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 \
     && python3 -m pip install -U pip setuptools wheel \
     && python3 -m pip install -U \