diff --git a/docker-compose.ci.yml b/docker-compose.ci.yml
index 4ada043..bf26c4b 100644
--- a/docker-compose.ci.yml
+++ b/docker-compose.ci.yml
@@ -7,6 +7,9 @@ services:
       - MIX_ENV=test
     volumes:
       - '.:/app'
+      # These lines ensure the deps can be saved as build artifacts for caching
+      - '/app/deps'
+      - '/app/_build'
     ports:
       - '4008:4008'
     command: tail -F /dev/null