diff --git a/docs/Gemfile b/docs/Gemfile
index bcd3be7d0..b1e938a7d 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -1,3 +1,8 @@
 source 'https://rubygems.org'
+
+# NOTE: This is workaround for error on octokit (from faraday 0.16.1).
+# https://github.com/lostisland/faraday/issues/1033
+gem 'faraday', '<=0.15.4'
+
 gem 'github-pages', group: :jekyll_plugins
 gem 'jekyll-redirect-from'