diff --git a/ext/fcntl/fcntl.gemspec b/ext/fcntl/fcntl.gemspec
index 0e3194fbdc..c27a03d47a 100644
--- a/ext/fcntl/fcntl.gemspec
+++ b/ext/fcntl/fcntl.gemspec
@@ -18,8 +18,4 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
   spec.extensions    = "ext/fcntl/extconf.rb"
   spec.required_ruby_version = ">= 2.3.0"
-
-  spec.add_development_dependency "bundler", "~> 1.14"
-  spec.add_development_dependency "rake", "~> 12"
-  spec.add_development_dependency "rake-compiler"
 end