diff --git a/pry-remote.gemspec b/pry-remote.gemspec
index 2373c3c..ba0689a 100644
--- a/pry-remote.gemspec
+++ b/pry-remote.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
 
   s.require_paths = ["lib"]
 
-  s.add_dependency "slop", "~> 3.0"
+  s.add_dependency "slop", "~> 4.0"
   s.add_dependency "pry",  "~> 0.9"
 
   s.executables = ["pry-remote"]