diff --git a/result/Dockerfile b/result/Dockerfile
index d736db9..9ddc77b 100644
--- a/result/Dockerfile
+++ b/result/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:5.11.0-slim
+FROM node:8.9-slim
 
 WORKDIR /app
 
diff --git a/result/tests/Dockerfile b/result/tests/Dockerfile
index bca8c51..cb5a5eb 100644
--- a/result/tests/Dockerfile
+++ b/result/tests/Dockerfile
@@ -1,5 +1,11 @@
-FROM node
-RUN npm install -g phantomjs
+FROM node:8.9-slim
+RUN apt-get update -qq && apt-get install -qy \
+    ca-certificates \
+    bzip2 \
+    curl \
+    libfontconfig \
+    --no-install-recommends
+RUN yarn global add phantomjs-prebuilt
 ADD . /app
 WORKDIR /app
 CMD ["/app/tests.sh"]