diff --git a/Gemfile b/Gemfile
index 782a432..5fcaefb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,6 +4,9 @@ gem 'jekyll', '~> 4.3.0'
 gem 'coderay', '~> 1.1.0'
 gem 'rake-jekyll', '~> 1.1.0'
 
+# Fix for mismatched deps: https://github.com/ffi/ffi/issues/1103
+gem "ffi", "< 1.17.0"
+
 group :jekyll_plugins do
   gem 'jekyll-asciidoc', '~> 3.0.0'
 end