diff --git a/puppet_forge.gemspec b/puppet_forge.gemspec
index 612b61e..b59f36d 100644
--- a/puppet_forge.gemspec
+++ b/puppet_forge.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 3.1.0'
 
-  spec.add_runtime_dependency "base64", '~> 0.2.0'
+  spec.add_runtime_dependency "base64", '>= 0.2.0', '< 0.4.0'
   spec.add_runtime_dependency "faraday", "~> 2.0"
   spec.add_runtime_dependency "faraday-follow_redirects", "~> 0.3.0"
   spec.add_dependency "minitar",  '~> 1.0', '>= 1.0.2'