diff --git a/Gemfile b/Gemfile
index b4cdc4e..274b2d1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,8 @@ gem 'soloist',    require: false
 gem 'foodcritic', require: false
 gem 'rspec',      require: false
 gem 'rubocop',    require: false
+
+# Temporarily lock these gems. Newer versions depend on Ruby >= 2.1.0
+# Remove this once https://github.com/mkocher/soloist/issues/39 is closed
+gem 'chef', '~> 12.8.1', require: false
+gem 'chef-zero', '~> 4.5.0', require: false