diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 3a1750d..618efba 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.2']
+        ruby-version: ['3.4']
     steps:
     - uses: actions/checkout@v5
     - name: Set up Ruby
diff --git a/.gitignore b/.gitignore
index 446fd6d..5b1b92b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,8 +5,5 @@
 # Specific to IntelliJ
 .idea/
 
-# Specific to rbenv
-.ruby-version
-
 # Codecov local cache
 /coverage/
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..7bcbb38
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.4.9
diff --git a/ontologies_api_client.gemspec b/ontologies_api_client.gemspec
index 0bb5ebf..fa09878 100644
--- a/ontologies_api_client.gemspec
+++ b/ontologies_api_client.gemspec
@@ -16,6 +16,7 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.name          = 'ontologies_api_client'
   gem.require_paths = ['lib']
+  gem.required_ruby_version = '>= 3.4', '< 3.5'
   gem.version       = LinkedData::Client::VERSION
 
   gem.add_dependency('activesupport', '8.0.3')