diff --git a/.travis.yml b/.travis.yml
index 2b4f4188..412b735c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,4 +13,6 @@ before_install:
 script:
 - make
 - docker run --rm -t -v "$(pwd):/app" -w /app/ui/app elm-env elm-format --validate src/
-- docker run --rm -t -v "$(pwd):/app" -w /app/ui/app elm-env elm-make --yes src/Main.elm --output /dev/null
+- docker run --rm -t -v "$(pwd):/app" -w /app/ui/app elm-env elm-make --yes src/Main.elm --output script.js
+- docker run --rm -t -v "$(pwd):/usr/src/app" -w /usr/src/app golang make assets
+- git diff --exit-code
diff --git a/Makefile b/Makefile
index c1031a9a..f62c5f60 100644
--- a/Makefile
+++ b/Makefile
@@ -58,9 +58,10 @@ docker:
 assets:
 	@echo ">> writing assets"
 	-@$(GO) get -u github.com/jteeuwen/go-bindata/...
-# Using "-modtime 1" to make assets target deterministic. It sets all file time stamps to unix timestamp 1
-	@go-bindata $(bindata_flags) -modtime 1 -pkg ui -o ui/bindata.go ui/app/index.html ui/app/script.js
-	@go-bindata $(bindata_flags) -modtime 1 -pkg deftmpl -o template/internal/deftmpl/bindata.go template/default.tmpl
+# Using "-mode 420" and "-modtime 1" to make assets make target deterministic.
+# It sets all file permissions and time stamps to 420 and 1
+	@go-bindata $(bindata_flags) -mode 420 -modtime 1 -pkg ui -o ui/bindata.go ui/app/index.html ui/app/script.js
+	@go-bindata $(bindata_flags) -mode 420 -modtime 1 -pkg deftmpl -o template/internal/deftmpl/bindata.go template/default.tmpl
 
 promu:
 	@GOOS=$(shell uname -s | tr A-Z a-z) \
diff --git a/ui/Dockerfile b/ui/Dockerfile
index 034943ff..314a0b04 100644
--- a/ui/Dockerfile
+++ b/ui/Dockerfile
@@ -1,11 +1,3 @@
 FROM node:latest
 
-ENV ELM_FORMAT_VERSION 0.6.0-alpha
-ENV ELM_VERSION 0.18
-
-RUN npm install -g elm@0.18.0
-
-RUN wget https://github.com/avh4/elm-format/releases/download/${ELM_FORMAT_VERSION}/elm-format-${ELM_VERSION}-${ELM_FORMAT_VERSION}-linux-x64.tgz -O "elm-format"  && \
-    tar -xvzf elm-format && \
-    mv elm-format /usr/local/bin/elm-format && \
-    chmod +x /usr/local/bin/elm-format
\ No newline at end of file
+RUN npm install -g elm elm-format
\ No newline at end of file