diff --git a/cabal.project b/cabal.project
index 40592ffb43a..22ed47253bf 100644
--- a/cabal.project
+++ b/cabal.project
@@ -110,6 +110,9 @@ package cardano-ledger-mary
 package cardano-ledger-conway
   flags: +asserts
 
+package cardano-ledger-byron
+  ghc-options: -fno-warn-unused-packages
+
 -- Always write GHC env files, because they are needed for repl and by the doctests.
 write-ghc-environment-files: always
 
diff --git a/eras/byron/ledger/impl/cardano-ledger-byron.cabal b/eras/byron/ledger/impl/cardano-ledger-byron.cabal
index bc9d5ea3182..c2026683810 100644
--- a/eras/byron/ledger/impl/cardano-ledger-byron.cabal
+++ b/eras/byron/ledger/impl/cardano-ledger-byron.cabal
@@ -234,6 +234,7 @@ library
         bimap >=0.4 && <0.6,
         binary,
         bytestring,
+        Cabal >=3.12,
         canonical-json,
         cardano-crypto,
         cardano-crypto-wrapper,