diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 219077d79b8..b917c645ff8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -134,6 +134,11 @@ spinach 9 10: *spinach-knapsack
   image: "ruby:2.3"
   only:
     - master
+  cache:
+    key: "ruby-23"
+    paths:
+      - vendor/apt
+      - vendor/ruby
 
 .rspec-knapsack-ruby23: &rspec-knapsack-ruby23
   <<: *rspec-knapsack