diff --git a/Gemfile b/Gemfile
index a167ae7d..eeaf9d03 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,6 +3,11 @@
 source "https://rubygems.org"
 gemspec :name => "jekyll"
 
+# Temporarily lock ffi gem to v1.12.x on Windows
+platforms :mswin, :mingw, :x64_mingw do
+  gem "ffi", "~> 1.12.2"
+end
+
 gem "rake", "~> 13.0"
 
 group :development do