diff --git a/Dockerfile b/Dockerfile
index 497c771f..3d575504 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.1.3-alpine
+FROM ruby:2.7.6-alpine
 
 # Create our application directory
 RUN mkdir -p /usr/src/app
@@ -19,7 +19,7 @@ RUN set -x \
   # General clean-up
   && rm -rf guide.tgz \
   # Need jekyll to serve the pages
-  && gem install public_suffix:4.0.7 jekyll
+  && gem install public_suffix:4.0.7 jekyll:4.2.2
 
 EXPOSE 4000
 
diff --git a/Gemfile.lock b/Gemfile.lock
index dc6cf694..75f6e26a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -86,7 +86,6 @@ PLATFORMS
   ruby
   x86_64-darwin-20
   x86_64-linux
-  x86_64-linux-musl
 
 DEPENDENCIES
   html-proofer (~> 3.19, >= 3.19.4)