Fix rake vulnerability in .gemspec file

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased] -
+
+### Fixed
+- Fix rake vulnerability in `.gemspec` file.
+
 ## [1.4.4] - 2019-08-20
 
 ### Fixed

jekyll-theme-basically-basic.gemspec

@@ -22,5 +22,5 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jekyll-sitemap", "~> 1.3"
 
   spec.add_development_dependency "bundler"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", ">= 12.3.3"
 end