diff --git a/neo4j.gemspec b/neo4j.gemspec
index 144e32ab9..2c19845c3 100644
--- a/neo4j.gemspec
+++ b/neo4j.gemspec
@@ -31,7 +31,7 @@ A Neo4j OGM (Object-Graph-Mapper) for use in Ruby on Rails and Rack frameworks h
   s.add_dependency("activesupport", "~> 4")
   s.add_dependency("railties", "~> 4")
   s.add_dependency('active_attr', "~> 0.8")
-  s.add_dependency("neo4j-core", "~> 3.1.0")
+  s.add_dependency("neo4j-core", "~> 4.0.0")
 
   if RUBY_PLATFORM =~ /java/
     s.add_dependency("neo4j-community", '~> 2.0')