diff --git a/lib/psych/versions.rb b/lib/psych/versions.rb
index f39d30ce..a9585c88 100644
--- a/lib/psych/versions.rb
+++ b/lib/psych/versions.rb
@@ -5,6 +5,6 @@ module Psych
   VERSION = '5.0.0.dev'
 
   if RUBY_ENGINE == 'jruby'
-    DEFAULT_SNAKEYAML_VERSION = '1.31'.freeze
+    DEFAULT_SNAKEYAML_VERSION = '1.33'.freeze
   end
 end