diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 00000000..5436ea06
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.3.2
\ No newline at end of file
diff --git a/Gemfile b/Gemfile
index 5b257c9a..bdbcb470 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,6 @@
 source "https://rubygems.org"
 
+ruby '~> 3.3'
 gem "github-pages", group: :jekyll_plugins
 
 gem "webrick", "~> 1.7"