diff --git a/Gemfile b/Gemfile
index 7a7950b399..7bca0c1013 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,9 @@ gem "rake-compiler"
 gem "test-unit"
 
 platforms :mri, :mswin, :mingw, :x64_mingw do
-  gem "ffi"
+  if RUBY_VERSION >= '3.0.0'
+    gem "ffi"
+  end
   gem "parser"
   gem "ruby_memcheck"
   gem "ruby_parser"