diff --git a/spring-watcher-listen.gemspec b/spring-watcher-listen.gemspec
index 32d83fc..28ade90 100644
--- a/spring-watcher-listen.gemspec
+++ b/spring-watcher-listen.gemspec
@@ -18,6 +18,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake"
   spec.add_development_dependency "activesupport"
 
-  spec.add_dependency "spring", ">= 1.2", "< 3.0"
+  spec.add_dependency "spring", ">= 1.2", "< 4.0"
   spec.add_dependency "listen", ">= 2.7", '< 4.0'
 end