diff --git a/cmd/suggestion/hyperopt/v1alpha3/Dockerfile b/cmd/suggestion/hyperopt/v1alpha3/Dockerfile
index f1f912c9875..58b8b9802f4 100644
--- a/cmd/suggestion/hyperopt/v1alpha3/Dockerfile
+++ b/cmd/suggestion/hyperopt/v1alpha3/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3
+FROM python:3.6
 
 RUN if [ "$(uname -m)" = "ppc64le" ]; then \
         apt-get -y update && \