diff --git a/Dockerfile b/Dockerfile
index 72e95f8..d48c92c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,16 +1,16 @@
-FROM ruby:2.6-alpine
+FROM ruby:3.1-alpine
 
 ENV REVIEWDOG_VERSION=v0.14.1
 
 SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
 
 # hadolint ignore=DL3006
-RUN apk add --update --no-cache build-base git
+RUN apk --no-cache add git
 
 RUN wget -O - -q https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh| sh -s -- -b /usr/local/bin/ ${REVIEWDOG_VERSION}
 
 # hadolint ignore=DL3006
-RUN gem install haml_lint
+RUN gem install haml_lint 'rubocop:~>1.31.2' rubocop-rails rubocop-performance rubocop-rake rubocop-rspec
 
 COPY entrypoint.sh /entrypoint.sh