diff --git a/ext/gdbm/gdbm.gemspec b/ext/gdbm/gdbm.gemspec
index 849e289f9d..bb5ab7d59f 100644
--- a/ext/gdbm/gdbm.gemspec
+++ b/ext/gdbm/gdbm.gemspec
@@ -18,9 +18,4 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
   spec.extensions    = ["ext/gdbm/extconf.rb"]
   spec.required_ruby_version = ">= 2.3.0"
-
-  spec.add_development_dependency "bundler", "~> 1.14"
-  spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "rake-compiler"
-  spec.add_development_dependency "test-unit"
 end