diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5828c4d1da3c3e202459aef134bd8e3364eaca76..fc38c77a81d3cdeef80eb891b4c82218e7039433 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,5 +13,5 @@ cache:
 deploy_site:
   stage: deploy
   script:
-    - bundle install --path=vendor/
-    - bundle exec jekyll build
+    - env LANG=en_US.UTF-8 bundle install --path=vendor/
+    - env LANG=en_US.UTF-8 bundle exec jekyll build