diff --git a/Dockerfile b/Dockerfile
index f1360a2..82aa084 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,6 +15,7 @@ RUN set -eux && \
         git \
         man \
         less \
+        bind9-dnsutils \
     && \
     rm -rf /var/lib/apt/lists/* && \
     rm /etc/ssh/ssh_host_*key* && \