diff --git a/flake.nix b/flake.nix
index cbc93fd..405663a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -156,7 +156,7 @@
                                                # Hard-coded deps/extensions match IHP default.nix template
                                                # (pinned flake — these won't drift without a flake update).
                                                cat > "$_cabal" <<CABAL_EOF
-cabal-version: 2.2
+cabal-version: 3.0
 name: $_pname
 version: 0.1.0
 build-type: Simple