diff --git a/shells/ruby.nix b/shells/ruby.nix
index 2174fc6..40ced25 100644
--- a/shells/ruby.nix
+++ b/shells/ruby.nix
@@ -4,4 +4,7 @@
     postgresql_15
     rubyPackages_3_2.rspec-core
   ];
+  shellHook = ''
+    export BUNDLE_USER_HOME="$PWD/.nix/bundle"
+  '';
 }