diff --git a/Dockerfile b/Dockerfile
index b214c37..f26219f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,14 +1,14 @@
 FROM ubuntu:14.04
 MAINTAINER Tobe O <thosakwe@gmail.com>
 
-# Install Dart SDK 1.20.0
+# Install Dart SDK 1.21.0
 RUN sudo apt-get update
 RUN sudo apt-get install -y apt-transport-https
 RUN sudo apt-get install -y curl
 RUN sudo sh -c 'curl https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -'
 RUN sudo sh -c 'curl https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_stable.list > /etc/apt/sources.list.d/dart_stable.list'
 RUN sudo apt-get update
-RUN sudo apt-get install -y dart=1.20.*
+RUN sudo apt-get install -y dart=1.21.0-1
 RUN export PATH="/usr/lib/dart/bin:$PATH"
 
 # Copy necessary files