diff --git a/Dockerfile b/Dockerfile
index 50f9ae5..ddac01f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update && \
         slapd \
         ldap-utils \
         libsasl2-modules-gssapi-mit \
+        krb5-user \
         python3-jinja2 \
         python3-ldap3 && \
     rm -rf /var/lib/apt/lists/*