diff --git a/jekyll-rtd-theme.gemspec b/jekyll-rtd-theme.gemspec
index e66fa8212c..faf950c38c 100644
--- a/jekyll-rtd-theme.gemspec
+++ b/jekyll-rtd-theme.gemspec
@@ -10,5 +10,5 @@ Gem::Specification.new do |spec|
 
   spec.files         = `git ls-files -z`.split("\x0").select { |f| f.match(%r!^(assets|_layouts|_includes|_sass|LICENSE|README)!i) }
 
-  spec.add_runtime_dependency "github-pages", "~> 209"
+  spec.add_runtime_dependency "github-pages", ">= 209", "< 213"
 end