diff --git a/Dockerfile b/Dockerfile
index ab7f09e25..bb55447cb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1 +1 @@
-FROM zzak/ruby-openssl-docker:2.0
+FROM junaruga/ruby-openssl-docker:2.1
diff --git a/tool/ruby-openssl-docker/init.sh b/tool/ruby-openssl-docker/init.sh
index 4d97e28c7..27e25bbd8 100755
--- a/tool/ruby-openssl-docker/init.sh
+++ b/tool/ruby-openssl-docker/init.sh
@@ -15,6 +15,8 @@ export PATH="/opt/ruby/${RUBY_VERSION}/bin:$PATH"
 export LD_LIBRARY_PATH="/opt/openssl/${OPENSSL_VERSION}/lib"
 export PKG_CONFIG_PATH="/opt/openssl/${OPENSSL_VERSION}/lib/pkgconfig"
 
+which rake || gem instal rake
+
 rake install_dependencies USE_HTTP_RUBYGEMS_ORG=1
 
 exec $*