Update pg-ldap-sync.gemspec

Author: larskanis

pg-ldap-sync.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "logger", "~> 1.0"
   spec.add_development_dependency "ruby-ldapserver", "~> 0.7"
   spec.add_development_dependency "minitest", "~> 5.0"
-  spec.add_development_dependency "bundler", ">= 1.16", "< 3.0"
+  spec.add_development_dependency "bundler", ">= 1.16", "< 4.0"
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "minitest-hooks", "~> 1.4"
 end