diff --git a/docs/Gemfile b/docs/Gemfile
index 42261e2..ecaee79 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -4,9 +4,9 @@ source "https://rubygems.org"
 
 # gem "rails"
 gem 'wdm', '>= 0.1.0' if Gem.win_platform?
-gem "github-pages", group: :jekyll_plugins
+gem "github-pages", ">= 229", group: :jekyll_plugins
 gem "webrick", "~> 1.8"
-gem "jekyll-avatar"
+gem "jekyll-avatar", ">= 0.8.0"
 gem "jekyll-sitemap"
 gem "jekyll-optional-front-matter", "~> 0.3.2"
 gem "jekyll-gist"
\ No newline at end of file