diff --git a/.circleci/config.yml b/.circleci/config.yml
index cafbb3b..a3bd4a3 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,10 +7,14 @@
           - image: circleci/buildpack-deps:stretch
         steps:
           - checkout
+          - run: git submodule sync
+          - run: git submodule update --init
           - setup_remote_docker
+              docker_layer_caching: true  # default - false
           - run:
               name: Build Docker image
-              command: pushd package; docker build -f Dockerfile -t $IMAGE_NAME:latest .
+              command: pushd package; docker build -f Dockerfile -t $IMAGE_NAME:build .
+
     workflows:
       version: 2
       build-publish: