Dockerfile in grape-jwt-authentication-2.0.4 vs Dockerfile in grape-jwt-authentication-2.1.0

@@ -1,19 +1,18 @@
 FROM hausgold/ruby:2.5
 MAINTAINER Hermann Mayer <[e-mail]>
 
 # Update system gem
-RUN gem update --system
+RUN gem update --system '3.3.26'
 
 # Install system packages and the latest bundler
 RUN apt-get update -yqqq && \
   apt-get install -y \
     build-essential locales sudo vim \
     ca-certificates \
     bash-completion inotify-tools && \
   echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen && /usr/sbin/locale-gen && \
-  gem install bundler -v '~> 2.0' --no-document --no-prerelease && \
-  gem install bundler -v '~> 1.0' --no-document --no-prerelease
+  gem install bundler -v '~> 2.3.0' --no-document --no-prerelease
 
 # Add new web user
 RUN mkdir /app && \
   adduser web --home /home/web --shell /bin/bash \
     --disabled-password --gecos ""