Update gemspec

simd.gemspec

@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 Gem::Specification.new do |s|
   s.name = 'simd'
-  s.version = '0.5.2'
+  s.version = '0.5.3'
 
   s.description = 'Access to SIMD (Single Instruction Multiple Data) instructions in Ruby'
   s.summary     = 'SIMD instructions in ruby'
@@ -9,13 +11,13 @@ Gem::Specification.new do |s|
   s.homepage    = 'https://github.com/wuest/simd-ruby'
   s.license     = 'MIT'
 
+  s.required_ruby_version = '>= 2.7.0'
+
   s.metadata['homepage_uri'] = s.homepage
   s.metadata['source_code_uri'] = s.homepage
   s.metadata['changelog_uri'] = 'https://github.com/wuest/simd-ruby/blob/main/CHANGELOG.md'
+  s.metadata['rubygems_mfa_required'] = 'true'
 
   s.files = `git ls-files ext`.split("\n")
   s.extensions = 'ext/simd/extconf.rb'
-
-  s.add_development_dependency 'rake-compiler', '~> 1.2'
-  s.add_development_dependency 'minitest-proptest', '~> 0.0'
 end