diff --git a/solidus_multi_domain.gemspec b/solidus_multi_domain.gemspec
index 7610432..4981fc7 100644
--- a/solidus_multi_domain.gemspec
+++ b/solidus_multi_domain.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency 'deface', '~> 1.0'
-  spec.add_dependency 'solidus_core', ['>= 2.6.0', '< 4']
+  spec.add_dependency 'solidus_core', '>= 2.6.0', '< 5'
   spec.add_dependency 'solidus_support', '~> 0.5'
 
   spec.add_development_dependency 'coffee-rails'