diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5fe4afeb2c8748712ce79edf4d959bb2abca0e15..7c2cef26df02f83a1cb59f4b828124a93419fc39 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -11,7 +11,7 @@ build:less:
   before_script:
     - yarn global add less
     - yarn global add less-plugin-clean-css
-    - apk add --update --no-cache git
+    - apk add --update --no-cache git zip
   script:
     - /usr/local/bin/lessc "${LESS_SRC}" > "${LESS_OUTPUT}"
     - git archive HEAD --prefix="${PLUGIN_NAME}/" --format=zip -o "${PLUGIN_NAME}.zip"