diff --git a/cabal.project b/cabal.project
index 488a65f6e0..b9be8784d0 100644
--- a/cabal.project
+++ b/cabal.project
@@ -36,3 +36,10 @@ import: ./asserts.cabal
 if(os(windows))
   constraints:
     bitvec -simd
+
+-- TODO add corresponding CHaP revisions
+allow-newer:
+  , cardano-ledger-babbage-test:cardano-ledger-shelley
+  , cardano-ledger-babbage-test:cardano-ledger-babbage
+  , cardano-ledger-conway-test:cardano-ledger-babbage
+  , cardano-ledger-conway-test:cardano-ledger-conway