diff --git a/.circleci/config.yml b/.circleci/config.yml
index 640518d0..09148612 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,7 +9,7 @@ jobs:
            PG_CONNECTION_STRING: postgres://postgres:postgres@localhost:5432/circle_test
            TIMEOUT: 15000
       # use postgres 9.6
-      - image: circleci/postgres:9.6-alpine-postgis
+      - image: circleci/postgres:9.6-alpine-postgis-ram
         environment:
           POSTGRES_USER: postgres
           POSTGRES_DB: circle_test