diff --git a/just-the-docs.gemspec b/just-the-docs.gemspec
index 438221c314dabec36be9f6ae60e439ee674a054f..fe2821b5bd59cb811d3d98dd84a2a6c2298c76df 100644
--- a/just-the-docs.gemspec
+++ b/just-the-docs.gemspec
@@ -12,10 +12,10 @@ Gem::Specification.new do |spec|
 
   spec.files         = `git ls-files -z`.split("\x0").select { |f| f.match(%r{^(assets|bin|_layouts|_includes|lib|Rakefile|_sass|LICENSE|README)}i) }
   spec.executables   << 'just-the-docs'
-
+  
+  spec.add_runtime_dependency "bundler", "~> 2.1.4"
   spec.add_runtime_dependency "jekyll", "~> 3.8.5"
   spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.0"
   spec.add_runtime_dependency "rake", "~> 12.3.1"
 
-  spec.add_development_dependency "bundler", "~> 2.1.4"
 end