diff --git a/Gemfile b/Gemfile
index 3fa5c9f..63c8956 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,5 +12,5 @@ platform :rbx do
   # at all (see e.g. https://github.com/seattlerb/minitest/issues/358). So, I'm
   # holding this one back until we find out what's going on.
   gem "rubysl-test-unit", "2.0.1"
-  gem "psych", "~> 2.0"
+  gem "psych", "~> 3.0"
 end