diff --git a/Dockerfile b/Dockerfile
index 523f194..889095e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update --fix-missing && \
     prosody \
     lua-dbi-mysql \
     lua-sec \
+    lua-unbound \
     openssl \
     netcat-traditional \
     && rm -rf /var/lib/apt/lists/*