diff --git a/octokit.gemspec b/octokit.gemspec
index ba79e9e7d..c9ca5afad 100644
--- a/octokit.gemspec
+++ b/octokit.gemspec
@@ -5,6 +5,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'octokit/version'
 
 Gem::Specification.new do |spec|
+  spec.add_dependency 'base64'
   spec.add_dependency 'faraday', '>= 1', '< 3'
   spec.add_dependency 'sawyer', '~> 0.9'
   spec.authors = ['Wynn Netherland', 'Erik Michaels-Ober', 'Clint Shryock']