diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5377a01..2c0cf1b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,6 +5,8 @@ variables:
   LC_ALL: en_US.UTF-8
 
 before_script:
+  - apk add --no-cache g++ musl-dev make
+  - apk add --no-cache libstdc++
   - bundle install --path=vendor/
 
 build site: