Dockerfile in squib-0.18.0 vs Dockerfile in squib-0.19.0a

@@ -1,27 +1,27 @@
-# This is the official Squib Docker image.
-#
-FROM ruby:2.7-slim
-WORKDIR /usr/src/app
-
-LABEL org.squib.url=http://squib.rocks \
-      org.squib.github=https://github.com/andymeneely/squib
-
-RUN apt-get update && \
-    apt-get install -y \
-    libgirepository1.0-dev \
-    build-essential \
-    ruby-dev \
-    ruby \
-    ruby-gdk-pixbuf2 \
-    git \
-    fonts-open-sans
-
-# Build the current directory of Squib
-COPY . /usr/src/app
-RUN rm -f /usr/src/app/Gemfile.lock
-RUN gem install bundler
-RUN bundle install
-RUN bundle exec rake install
-
-# ENTRYPOINT [ "sh" ]
-
+# This is the official Squib Docker image.
+#
+FROM ruby:3.0-slim
+WORKDIR /usr/src/app
+
+LABEL org.squib.url=http://squib.rocks \
+      org.squib.github=https://github.com/andymeneely/squib
+
+RUN apt-get update && \
+    apt-get install -y \
+    libgirepository1.0-dev \
+    build-essential \
+    ruby-dev \
+    ruby \
+    ruby-gdk-pixbuf2 \
+    git \
+    fonts-open-sans
+
+# Build the current directory of Squib
+COPY . /usr/src/app
+RUN rm -f /usr/src/app/Gemfile.lock
+RUN gem install bundler
+RUN bundle install
+RUN bundle exec rake install
+
+# ENTRYPOINT [ "sh" ]
+