diff --git a/Gemfile b/Gemfile
index 16f3338..430f85a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,5 +9,6 @@ gem 'overcommit', '0.62.0'
 # Pin tool versions (which are executed by Overcommit) for CI builds
 gem 'rubocop', '1.44.1'
 
+gem 'base64', '~> 0.2.0'
 gem 'simplecov', '~> 0.22.0'
 gem 'simplecov-lcov', '~> 0.8.0'