diff --git a/Dockerfile b/Dockerfile
index c43857a..5cd1b24 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ RUN apk list -I && \
     ruby ruby-dev yaml yaml-dev \
     libffi-dev build-base git nodejs
 RUN gem env
-RUN gem install etc bundler --no-document
+RUN gem install etc bundler -v 2.3.26 --no-document
 RUN pwd
 RUN ls -l
 RUN bundle install