diff --git a/.drone.yml b/.drone.yml
index 9a18e36..e72146f 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -5,7 +5,7 @@ steps:
   - name: build
     image: ruby
     commands:
-      - gem install bundler
+      - gem install bundler:1.17.3
       - bundle install
       - bundle exec jekyll build