diff --git a/Dockerfile b/Dockerfile
index 466e0a1d7..51e49cfe6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM sitespeedio/webbrowsers
+FROM sitespeedio/webbrowsers:firefox-49.0-chrome-54.0
 
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app