diff --git a/CHANGES.md b/CHANGES.md
index 5768750b3..114cdb747 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -21,6 +21,9 @@
 - Error in case where multiple packages with different dev-repo fields would be
   placed in the same duniverse directory (#377, @gridbugs)
 
+- Fix a failure when using opam-monorepo with an opam 2.2 root
+  (#379, @kit-ty-kate)
+
 ### Removed
 
 ### Security
diff --git a/bin/opam_monorepo.ml b/bin/opam_monorepo.ml
index 0fe6234e2..d11df5184 100644
--- a/bin/opam_monorepo.ml
+++ b/bin/opam_monorepo.ml
@@ -21,7 +21,7 @@ let cmds = [ Lock.cmd; Pull.cmd; Depext.cmd; List_cmd.cmd ]
 let init_opam () =
   OpamSystem.init ();
   let root = OpamStateConfig.opamroot () in
-  ignore (OpamStateConfig.load_defaults root);
+  ignore (OpamStateConfig.load_defaults ~lock_kind:`Lock_read root);
   OpamFormatConfig.init ();
   OpamCoreConfig.init ~safe_mode:true ();
   OpamRepositoryConfig.init ();