diff --git a/Dockerfile b/Dockerfile
index 7bbbade..67bce18 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,7 +17,7 @@ LABEL org.label-schema.build-date=$BUILD_DATE \
       com.microscaling.docker.dockerfile="/Dockerfile" \
       com.microscaling.license="MIT"
 
-RUN apk add --no-cache bash "prosody"
+RUN apk add --no-cache bash "prosody" lua5.2-ldap
 RUN mkdir -p /etc/prosody/conf.d /usr/local/lib/prosody/modules
 
 COPY prosody.cfg.lua /etc/prosody/prosody.cfg.lua