diff --git a/Gemfile b/Gemfile
index 05e824acba..f1d9495d79 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ end
 
 source 'https://rubygems.org'
 
-ruby ENV.fetch('OSEM_RUBY_VERSION', '3.1.4')
+ruby '~> 3.1.4'
 
 # as web framework
 if next?