diff --git a/garth-jekyll-theme.gemspec b/garth-jekyll-theme.gemspec
index de286c3..082b28c 100644
--- a/garth-jekyll-theme.gemspec
+++ b/garth-jekyll-theme.gemspec
@@ -15,8 +15,8 @@ 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 "jekyll", "~> 3.6"
+  spec.add_runtime_dependency "jekyll", ">= 3.6", "< 5.0"
   spec.add_runtime_dependency "jekyll-paginate", "~> 1.1"
 
-  spec.add_development_dependency "bundler", "~> 1.14"
+  spec.add_development_dependency "bundler", ">= 1.14", "< 3.0"
 end