Tighten TruffleRuby json root cap

pboling · pboling · commit 5fd10b582f5f · 2026-06-03T10:25:35.000-06:00
diff --git a/Appraisal.root.gemfile b/Appraisal.root.gemfile
@@ -16,5 +16,5 @@ source "https://gem.coop"
 gemspec
 
 if defined?(RUBY_ENGINE) && RUBY_ENGINE == "truffleruby"
-  gem "json", "< 2.19"
+  gem "json", "< 2.18"
 end
