diff --git a/utils/hp2ps/hp2ps.cabal b/utils/hp2ps/hp2ps.cabal
index b4062b2cb5f7bdb6bf8f39d79ac2e33765bca802..1b486945645c8a2cf4875daeb55e4a7e2895fd6e 100644
--- a/utils/hp2ps/hp2ps.cabal
+++ b/utils/hp2ps/hp2ps.cabal
@@ -1,4 +1,4 @@
-cabal-version: 2.1
+cabal-version: 2.4
 Name: hp2ps
 Version: 0.1
 Copyright: XXX
diff --git a/utils/unlit/unlit.cabal b/utils/unlit/unlit.cabal
index 622a55934d80201c5b6c92c534a6860781273461..e49fd8558be28a8b08bf215e62080da5d17cfd14 100644
--- a/utils/unlit/unlit.cabal
+++ b/utils/unlit/unlit.cabal
@@ -1,4 +1,4 @@
-cabal-version: 2.1
+cabal-version: 2.4
 Name: unlit
 Version: 0.1
 Copyright: XXX