diff --git a/wag.gemspec b/wag.gemspec
index 8145f4d..9608f53 100644
--- a/wag.gemspec
+++ b/wag.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description   = 'Generate and compile WebAssembly code from Ruby'
   spec.homepage      = 'https://code.harton.nz/james/wag'
   spec.license       = 'Hippocratic'
-  spec.required_ruby_version = Gem::Requirement.new('~> 3.2')
+  spec.required_ruby_version = Gem::Requirement.new('~> 3.3')
 
   # spec.metadata["allowed_push_host"] = "TODO: Set to 'http://mygemserver.com'"