diff --git a/rex.gemspec b/rex.gemspec
index b281682..d9d7f22 100644
--- a/rex.gemspec
+++ b/rex.gemspec
@@ -28,10 +28,10 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "rbtree", "~> 0.4.6"
 
-  spec.add_runtime_dependency "eventmachine", "~> 1.2"
-  spec.add_runtime_dependency "em-websocket", "~> 0.5"
+  spec.add_dependency "eventmachine", "~> 1.2"
+  spec.add_dependency "em-websocket", "~> 0.5"
 
-  spec.add_runtime_dependency "json-schema", "~> 4"
+  spec.add_dependency "json-schema", "~> 4"
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html
 end