diff --git a/fluentd/Dockerfile b/fluentd/Dockerfile
index 47a7033..c4a6686 100644
--- a/fluentd/Dockerfile
+++ b/fluentd/Dockerfile
@@ -5,5 +5,5 @@ RUN apt-get update \
  && rm -rf /var/lib/apt/lists/*
 RUN gem install fluent-plugin-rewrite-tag-filter
 RUN gem install fluent-plugin-gelf-hs
-RUN gem install gelf
+RUN gem install gelf -v 3.0.0
 COPY fluent.conf /fluentd/etc/
diff --git a/fluentd/fluent.conf b/fluentd/fluent.conf
index 2118295..c16edc1 100644
--- a/fluentd/fluent.conf
+++ b/fluentd/fluent.conf
@@ -45,8 +45,8 @@
   host vagrant_graylog_1
   port 12201
   protocol tcp
-  #tls true
-  #tls_options {"cert":"/fluentd/etc/pki/fluentd-signed.crt",
-  #             "key":"/fluentd/etc/pki/fluentd.key"}
+  tls true
+  tls_options {"cert":"/fluentd/etc/pki/fluentd-signed.crt",
+               "key":"/fluentd/etc/pki/fluentd.key"}
   flush_interval 5s
 </match>