diff --git a/Gemfile b/Gemfile
index b142d25..3831978 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 source "https://rubygems.org"
+ruby file: ".ruby-version"
 # For now this is a GitHub Pages hosted website.
 #   Ref: https://github.com/Mikaela/mikaela.github.io/issues/153
 #gem "github-pages"
diff --git a/Gemfile.lock b/Gemfile.lock
index d0080fc..a12f6fb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -222,5 +222,8 @@ DEPENDENCIES
   minima
   webrick
 
+RUBY VERSION
+   ruby 3.3.3p89
+
 BUNDLED WITH
    2.5.11