diff --git a/Dockerfile b/Dockerfile
index 3df4df2..2086786 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,4 +4,6 @@ EXPOSE 8080
 
 RUN /venv/bin/pip install git+https://github.com/alerta/alerta-contrib.git#subdirectory=integrations/mailer
 
+RUN /venv/bin/pip install dnspython==1.16.0
+
 COPY . ${WORKDIR}