diff --git a/bookstack/Dockerfile b/bookstack/Dockerfile
index eb3a211..03847cb 100644
--- a/bookstack/Dockerfile
+++ b/bookstack/Dockerfile
@@ -17,6 +17,7 @@ RUN \
         php7-fpm=7.4.15-r0 \
         php7-gd=7.4.15-r0 \
         php7-json=7.4.15-r0 \
+        php7-ldap=7.4.15-r0 \
         php7-mbstring=7.4.15-r0 \
         php7-mysqlnd=7.4.15-r0 \
         php7-openssl=7.4.15-r0 \