diff --git a/rex.gemspec b/rex.gemspec
index d613ef6..1898159 100644
--- a/rex.gemspec
+++ b/rex.gemspec
@@ -8,16 +8,12 @@ Gem::Specification.new do |spec|
   spec.authors = ["Tim Kächele"]
   spec.email = ["mail@timkaechele.me"]
 
-  spec.summary = "TODO: Write a short summary, because RubyGems requires one."
-  spec.description = "TODO: Write a longer description or delete this line."
-  spec.homepage = "TODO: Put your gem's website or public repo URL here."
+  spec.summary = "Order book and matching engine implementation"
+  spec.description = "A simple limit order book with a matching engine implementation"
+  spec.homepage = "https://git.timkaechele.me/rex"
   spec.required_ruby_version = ">= 2.6.0"
 
-  spec.metadata["allowed_push_host"] = "TODO: Set to your gem server 'https://example.com'"
-
   spec.metadata["homepage_uri"] = spec.homepage
-  spec.metadata["source_code_uri"] = "TODO: Put your gem's public repo URL here."
-  spec.metadata["changelog_uri"] = "TODO: Put your gem's CHANGELOG.md URL here."
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
@@ -30,8 +26,7 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  # Uncomment to register a new dependency of your gem
-  # spec.add_dependency "example-gem", "~> 1.0"
+  spec.add_dependency "rbtree", "~> 0.4.6"
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html