diff --git a/composer/Dockerfile b/composer/Dockerfile
index 4385d2924..8b24fe12d 100644
--- a/composer/Dockerfile
+++ b/composer/Dockerfile
@@ -1,7 +1,16 @@
+FROM golang:1.14.4-buster as tg-build
+
+ARG TESTGROUND_REF="oni"
+WORKDIR /usr/src
+RUN git clone https://github.com/testground/testground.git
+RUN cd testground && git checkout $TESTGROUND_REF && go build .
+
 FROM python:3.8-buster
 
 WORKDIR /usr/src/app
 
+COPY --from=tg-build /usr/src/testground/testground /usr/bin/testground
+
 RUN mkdir /composer && chmod 777 /composer
 RUN mkdir /testground && chmod 777 /testground