diff --git a/Dockerfile b/Dockerfile
index 6838ffa..2bd413f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,6 +8,8 @@ RUN git clone https://github.com/optiz0r/mcollective-puppetenvsh-agent \
   && cp -r mcollective-puppetenvsh-agent/agent/* /opt/puppetlabs/mcollective/plugins/mcollective/agent/ \
   && cp -r mcollective-puppetenvsh-agent/util/* /opt/puppetlabs/mcollective/plugins/mcollective/util/ \
   && rm -rf mcollective-puppetenvsh-agent
+  
+RUN echo "security.serializer = json" >> /etc/puppetlabs/mcollective/plugin.d/choria.cfg
 
 USER $MCO_CLIENT_USER
 WORKDIR /home/$MCO_CLIENT_USER
\ No newline at end of file