diff --git a/Gemfile b/Gemfile
index 7a7bf85..a84650e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -46,3 +46,7 @@ gem 'ood_appkit', '~> 2.1'
 gem 'ood_core', '~> 0.21.0'
 
 gem 'nokogiri', '>= 1.10.4'
+
+# ruby 3.1 ships psych 4 which breaks
+# and rails 6.0 does not have the patch
+gem 'psych', '< 4'
diff --git a/Gemfile.lock b/Gemfile.lock
index fbbd143..4a45db2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -141,6 +141,7 @@ GEM
       ood_support (~> 0.0.2)
       rexml (~> 3.2)
     ood_support (0.0.3)
+    psych (3.3.4)
     public_suffix (5.0.1)
     racc (1.6.2)
     rack (2.2.6.4)
@@ -233,6 +234,7 @@ DEPENDENCIES
   nokogiri (>= 1.10.4)
   ood_appkit (~> 2.1)
   ood_core (~> 0.21.0)
+  psych (< 4)
   rails (= 6.0.6.1)
   sass-rails (~> 5.0)
   sqlite3 (~> 1.4.0)