diff --git a/Gemfile b/Gemfile
index aab13687b8..9ce48a3f82 100644
--- a/Gemfile
+++ b/Gemfile
@@ -41,7 +41,7 @@ end
 
 group(:test) do
   # 1.16.0 - 1.16.2 are broken on Windows
-  gem 'ffi', '>= 1.15.5', '< 1.17.0', '!= 1.16.0', '!= 1.16.1', '!= 1.16.2', require: false
+  gem 'ffi', '>= 1.15.5', '!= 1.16.0', '!= 1.16.1', '!= 1.16.2', '< 1.18.0', require: false
   gem "json-schema", '>= 2', '< 6', require: false
   gem "rake", *location_for(ENV['RAKE_LOCATION'] || '~> 13.0')
   gem "rspec", "~> 3.1", require: false