Dockerfile in jabber_admin-1.2.0 vs Dockerfile in jabber_admin-1.3.0

@@ -1,18 +1,18 @@
-FROM hausgold/ruby:2.5
+FROM hausgold/ruby:2.7
 MAINTAINER Hermann Mayer <[e-mail]>
 
 # Update system gem
-RUN gem update --system '3.3.26'
+RUN gem update --system '3.4.22'
 
 # 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 '~> 2.3.0' --no-document --no-prerelease
+  gem install bundler -v '~> 2.4.22' --no-document --no-prerelease
 
 # Add new web user
 RUN mkdir /app && \
   adduser web --home /home/web --shell /bin/bash \
     --disabled-password --gecos ""